Canon MLT (F) User Manual

CXDI Image Processing Software  
MLT (F)  
User’s Manual  
Before using the instrument, be sure to read this manual thoroughly.  
Also, read the manuals of other instruments in this system.  
Keep the manual where it is easily accessible.  
Contents  
Notation Conventions  
Notation 1  
In this manual, the name of button is enclosed with a pair of brackets [ ], and the buttons that are selected in succession  
are connected with > to indicate the order.  
Example:  
On the Exposure screen, touch the followings:  
[SYSTEM] > [SETUP MENU]  
Operation:  
Touch the SYSTEM button on the first screen, and then touch the SETUP MENU button on  
the second screen.  
Touch the SYSTEM button (left), and then touch the SETUP MENU button (right)  
Notation 2  
If any detailed explanation for the operation or setting is available on other page in this manual, the page to refer is indi-  
cated with (page number).  
Example:  
Content:  
For details of the EFFECT parameter, refer to the step 2 in 2.2 Setting DWT ENHANCE. Tab  
On page 7, detailed description of the EFFECT feature is provided.  
Notation 3  
When description of the procedure or setting continues from an odd-numbered page (right page) to the subsequent even-  
numbered page (left page), a small note, [Continued on the following page »] appears at the bottom-right of the odd-  
numbered page to draw your attention.  
1. Overview  
1.1 About MLT (F)  
NOTE: MLT (F) is supported by CXDI System Software Version 4.3 or later.  
The CXDI Image Processing Software MLT (F) (called “MLT (F)” in this manual) is  
designed to extend the image processing functions provided with the CXDI series of Canon dig-  
ital radiography system (called “CXDI” in this manual).  
By installing MLT (F) on the Control PC, the advanced image processing features of MLT (F)  
are brought into full scope both in the Edit Exposure Mode and QA Mode.  
The following examples show the QA Mode screens of CXDI System Software version 6.3.  
Standard QA Mode Screen (DEP Tab)  
QA Mode Screen Extended by MLT (F) (DWT DEP Tab)  
– 1 –  
   
1.Overview  
1.2 Available Functions of MLT (F)  
This manual describes the operating procedures of the following three image processing func-  
tions that are available with MLT (F). For details and information on other image processing  
functions, please refer to Operation Manual and Setup Guide.  
DWT*1 Edge Enhancement (P.7)  
The DWT ENHANCE. tab provides the function to accentuate edge details of the expo-  
sure image by specifying the three parameters; the degree of enhancement (EFFECT),  
type of enhancement (FREQUENCY BASE), and type of density dependent of the  
image (DENSITY BASE).  
The DWT DEP tab provides the function to compress the dynamic range of the exposure  
image by specifying the six parameters; the density to start compression (STARTING  
DENSITY), compression ratio (DEP WEIGHT), and intensity of compression (DEP  
EFFECT) for both the High-Density Field (HIGH-DENS.) and Low-Density Field  
(LOW-DENS.).  
The imaging area on film or monitor is widened by decreasing the pixel value range in  
the second region of interest, without changing the minute structures in the first region of  
interest.  
DWT Noise Reduction (P.13)  
The DWT NOISE R. tab provides the function to reduce the noise components of the  
exposure image, and improve it’s granularity by specifying the two parameters; the  
degree of enhancement (EFFECT) and upper limit of density (PROCESSING UPPER  
LIMIT).  
NOTE: The effects resulting from changes to the parameters may be difficult to check  
in the exposure image of the QA mode screen.  
In these cases, check by touching [MAG.] or [QA-MAG.] to display the  
enlarged screen.  
Display of the Tabs  
At the time of installation, the service person can specify the fixed parameters, and set  
MLT (F) not to display the tabs for the individual settings of the DWT Edge  
Enhancement, DWT DEP and DWT Noise Reduction.  
*1  
*2  
This is an abbreviation for Discrete Wavelet Transform. This method of image  
processing is also called Multi-Frequency Processing.  
This is an abbreviation for Display Enhancement Processing. This method of  
image processing is also called Dynamic Range Compression Processing.  
– 2 –  
 
2. Edit Exposure Mode Settings  
The examples used in this chapter are the screens of CXDI System Software version 6.3.  
2.1 Procedures to Edit Exposure Mode  
Display the Edit Exposure Mode screen  
1
On the Exposure screen, touch the followings:  
[SYSTEM] > [EDIT EXPOSURE MODE].  
Button  
Sensor Unit  
Button  
Exposure Mode  
Category Tab  
Button  
Edit Exposure Mode Screen  
Select the Sensor Unit  
2
If two or more sensor units are being used in the system, touch the Sensor Unit button,  
then select the Sensor Unit.  
Select the Category tab  
3
If eight or more categories are registered in the system, touch the  
play the Category tabs that are not currently visible.  
or  
button to dis-  
Continued on the following page >>  
– 3 –  
   
2.Edit Exposure Mode Settings  
Select the Exposure Mode  
4
Make sure that [EDIT PARA.] at the top-left is highlighted, and select the desired Expo-  
sure Mode.  
The EDIT PARA. screen appears.  
EDIT PARA. Screen (first page)  
Display the next page  
5
Touch [NEXT PAGE].  
EDIT PARA. Screen (second page)  
Availability of Frequency Processing Mode  
If your CXDI System Software is the version 5.0 or before, there is no need to select  
the frequency processing mode as described in the next step (step 6). Skip the step 6  
and proceed to the step 7.  
– 4 –  
2.Edit Exposure Mode Settings  
Select MLT (F) FREQUENCY  
6
If MLT (F) FREQUENCY is not currently selected (in this case, the DWT ENHANCE.,  
DWT DEP, and DWT NOISE R. tabs are not displayed), touch the Frequency Pro-  
cessing Mode button to open the window, then touch [MLT (F) FREQUECY].  
Frequency  
Processing  
Mode  
Button  
Frequency Processing Mode Window  
Select the tab  
7
8
Touch the desired tab from among three tabs: DWT ENHANCE., DWT DEP, DWT  
NOISE R.  
DWT ENHANCE. Screen  
Set the parameters  
Set the parameters provided with the selected tab, referring to the corresponding descrip-  
Continued on the following page >>  
– 5 –  
2.Edit Exposure Mode Settings  
Save the parameters  
9
Touch [OK]. The window displaying the following message appears:  
Save the changed parameter.  
Then, touch [OK].  
When Password is required  
If the password is specified, a different message is displayed in the window as follows:  
Administrator’s authority is needed. Enter system password.  
In this case, touch anywhere within the frame to display On-Screen-Keyboard, and  
type your password, then touch [OK].  
– 6 –  
2.Edit Exposure Mode Settings  
2.2 Setting DWT ENHANCE. Tab  
Set the DWT Edge Enhancement effective  
1
Touch [EDGE ENHANCE.] to display the parameters. The appearance of the button  
switches over between the highlight (in white outline characters against a colored back-  
ground) and normal display each time you touch the button. The parameters are available  
when the button is highlighted.  
FREQUENCY  
BASE Button  
DENSITY  
BASE Button  
DWT ENHANCE. Screen with Parameters  
Set the EFFECT parameter  
2
Touch the  
or  
button, and set the value within the range between 1 to 20.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the degree of edge enhancement.  
Select a larger value for higher degree of enhancement, and select a smaller value for  
lower degree of enhancement.  
NOTE: If the EFFECT parameter is set to an excessive value, artifacts may occur in  
the image, or the effective data of the exposure image may be damaged.  
Check the output of exposure image, and if the results of enhancement  
appear to be too strong, either set the parameter to a smaller value, or set the  
DWT Edge Enhancement not effective.  
Continued on the following page >>  
– 7 –  
   
2.Edit Exposure Mode Settings  
Display the FREQUENCY BASE window  
3
Touch the FREQUENCY BASE button to open the window.  
FREQUENCY BASE Window  
The types of Frequency Bases are classified into two kinds, and are indicated with the  
buttons in different colors respectively as follows:  
Display of Button  
Blue Bar Graph  
Remarks  
Enhances the signals smoothly ranging from the low frequency  
area to the high frequency area.  
The results of enhancement appear natural with smooth frequent  
response characteristics.  
Enhances the structures in the specific frequency band stronger  
than the structure in other frequency bands.  
Green Bar Graph  
The bar graph in the each button shows the range of frequencies that enhancement  
applies to.  
To enhance the mass structure, such as soft tissues, select the Frequency Base that  
applies enhancement to the lower frequency. The range increases by including the lower  
frequency in ascending order from A or a. To enhance the minute structure, such as bone  
tissues, select the Frequency Base that limits enhancement to the lower frequency and  
covers only the higher frequency. The range decreases by excluding the lower frequency  
in descending order to A or a.  
Set the FREQUENCY BASE parameter  
4
Touch the desired Frequency Base button.  
The parameter is set for the Frequency Base selected, and the FREQUENCY BASE win-  
dow is closed.  
– 8 –  
 
2.Edit Exposure Mode Settings  
Display the DENSITY BASE window  
5
6
Touch the DENSITY BASE button to open the window.  
DENSITY BASE Window  
If granularity is too coarse on the Low-Density Field as the result of the enhancement,  
the quality can be improved by selecting the Density Base that applies weaker density  
enhancement to the area where the degradation of quality is obvious.  
Set the DENSITY BASE parameter  
Touch the desired Density Base button.  
The parameter is set for the Density Base selected, and the DENSITY BASE window is  
closed.  
– 9 –  
 
2.Edit Exposure Mode Settings  
2.3 Setting DWT DEP Tab  
2.3.1 Setting DWT DEP for High-Density Field  
Set the DWT DEP for the High-Density Field effective  
1
Touch [HIGH DENS.] to display the parameters. The appearance of the button switches  
over between the highlight (in white outline characters against a colored background)  
and normal display each time you touch the button. The parameters are available when  
the button is highlighted.  
DWT DEP Screen with Parameters of HIGH DENS.  
Set the STARTING DENSITY parameter of the High-Density Field  
2
3
Touch the  
or  
button, and set the value within the range between 0 to 30.  
If the parameters of the Low-Density Field are effective, this value cannot be set lower  
than the value of STARTING DENSITY of the Low-Density Field (P.12).  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the lower limit of density to start compression as shown in the fol-  
lowing table:  
Setting Values for Starting Density of High-Density Field  
Setting value  
Starting density (D) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6  
Setting value 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30  
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14  
Starting density (D) 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2  
Set the DEP WEIGHT parameter of the High-Density Field  
Touch the  
or  
button, and set the value within the range between 0 to 20.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the compression ratio in the density area that is larger than the value  
of STARTING DENSITY.  
Select a larger value for higher degree of compression, and select a smaller value for  
lower degree of compression.  
– 10 –  
   
2.Edit Exposure Mode Settings  
Set the DEP EFFECT parameter of the High-Density Field  
4
Touch the  
or  
button, and set the value within the range between 0 to 10.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the intensity of restoration in high frequency component that reflects  
the starting density and compression ratio of the High-Density Field.  
Select a larger value for higher degree of intensity, and select a smaller value for lower  
degree of intensity.  
NOTE: If the DEP EFFECT parameter is set to an excessive value, artifacts may  
occur in the image, or the effective data of the exposure image may be dam-  
aged.  
Check the exposure image, and if the results of compression appear to be too  
strong, either set the parameter to a smaller value, or set the DWT DEP not  
effective.  
2.3.2 Setting DWT DEP for Low-Density Field  
Set the DWT DEP for the Low-Density Field effective  
1
Touch [LOW DENS.] to display the parameters. The appearance of the button switches  
over between the highlight (in white outline characters against a colored background)  
and normal display each time you touch the button. The parameters are available when  
the button is displayed in highlight.  
DWT DEP Screen with Parameters of HIGH and LOW DENS.  
Continued on the following page >>  
– 11 –  
   
2.Edit Exposure Mode Settings  
Set the STARTING DENSITY parameter of the Low-Density Field  
2
Touch the  
or  
button, and set the value within the range between 0 to 30.  
If the parameters of the High-Density Field are effective, this value cannot be set lower  
than the value of STARTING DENSITY of the High-Density Field (P.10).  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the upper limit of density to start compression as shown in the fol-  
lowing table:  
Setting Values for Starting Density of Low-Density Field  
Setting value  
Starting density (D) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6  
Setting value 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30  
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14  
Starting density (D) 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2  
Set the DEP WEIGHT parameters of the Low-Density Field  
3
4
Touch the  
or  
button, and set the value within the range between 0 to 20.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the compression ratio in the density area that is smaller than the  
value of STARTING DENSITY.  
Select a larger value for higher degree of compression, and select a smaller value for  
lower degree of compression.  
Set the DEP EFFECT parameter of the Low-Density Field  
Touch the  
or  
button, and set the value within the range between 0 to 10.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the intensity of restoration in high frequency component that reflects  
the starting density and compression ratio of the Low-Density Field.  
Select a larger value for higher degree of intensity, and select a smaller value for lower  
degree of intensity.  
NOTE: If the DEP EFFECT parameter is set to an excessive value, artifacts may  
occur in the image, or the effective data of the exposure image may be dam-  
aged.  
Check the exposure image, and if the results of compression appear to be too  
strong, either set the parameter to a smaller value, or set the DWT DEP not  
effective.  
– 12 –  
     
2.Edit Exposure Mode Settings  
2.4 Setting DWT NOISE R. Tab  
Set the DWT Noise Reduction effective  
1
Touch [NOISE REDUCTION] to display the parameters. The appearance of the button  
switches over between the highlight (in white outline characters against a colored back-  
ground) and normal display each time you touch the button. The parameters are available  
when the button is displayed in highlight.  
DWT NOISE R. Screen with Parameters  
Set the EFFECT parameter  
2
Touch the  
or  
button, and set the value within the range between 1 to 10.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
Select a larger value for higher degree of noise reduction, and select a smaller value for  
lower degree of noise reduction.  
NOTE: If the EFFECT parameter is set to an excessive value, artifacts may occur in  
the image, or the effective data of the exposure image may be damaged.  
Check the output of exposure image, and if the results of noise reduction  
appear to be too strong, either set the parameter to a smaller value, or set the  
DWT Noise Reduction not effective.  
Set the PROCESSING UPPER LIMIT parameter  
3
Touch the  
or  
button, and set the value within the range between 0.2 to 3.2.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
The value indicates the upper limit of density to reduce the noises.  
– 13 –  
 
3. QA Mode Settings  
The examples used in this chapter are the screens of CXDI System Software version 6.3.  
3.1 Procedures to Change Parameters  
Image processing of the exposure images with CXDI is called QA (Quality Assurance) Process-  
ing, and can be performed by adjusting the parameters on the QA Mode screen to optimize the  
exposure image.  
Display the QA Mode screen  
1
Display the QA Mode screen by one of the following methods:  
QA Mode Screen  
To display the QA Mode screen automatically right after x-ray exposure  
On the Exposure screen, touch the followings to display the DISPLAYING PARAME-  
TER CHANGE/QA SCREEN DURING EXPOSURE screen:  
[SYSTEM] > [SETUP MENU] > [SYSTEM SETUP] > [DISPLAYING PARAME-  
TER CHANGE/QA SCREEN DURING EXPOSURE]  
Then set the QA Mode screen effective  
To perform QA Processing right after x-ray exposure  
Touch [QA] on the Preview screen.  
To perform QA Processing after examination  
Select the exposure image from the Study List, and display the selected image, then  
touch [QA].  
Availability of Frequency Processing Mode  
If your CXDI System Software is the version 5.0 or before, there is no need to select  
the frequency processing mode as described in the next step (step 2). Skip the step 2  
and proceed to the step 3.  
– 14 –  
   
3.QA Mode Settings  
Select MLT (F) FREQUENCY  
2
If MLT (F) FREQUENCY is not currently selected (in this case, the DWT ENHANCE.,  
DWT DEP, and DWT NOISE R. tabs are not displayed), touch the Frequency Pro-  
cessing Mode button to open the window, then touch [MLT (F) FREQUECY].  
Frequency  
Processing  
Mode  
BUTTON  
Frequency Processing Mode Window  
When the Frequency Processing Mode button is not visible  
If the Frequency Processing Mode button is not displayed on the screen, touch the  
button at the bottom part of the screen (CXDI System Software Version 5.1 or later  
only).  
Select the tab  
3
4
Touch the desired tab from among three tabs: DWT ENHANCE., DWT DEP, DWT  
NOISE R.  
Change the parameters  
Set the parameters provided with the selected tab, referring to the corresponding descrip-  
Continued on the following page >>  
– 15 –  
3.QA Mode Settings  
Save the new parameters  
5
6
To save new parameters as the default values of the Exposure Mode (except opening  
from Study List), touch [SAVE PARAM]. The window displaying the following message  
appears:  
Are you sure you want to change the default generator parameters?  
Then, touch [YES].  
When Password is required  
If the password is specified, a different message is displayed as follows:  
Administrator’s authority is needed. Enter system password.  
In this case, touch within the frame to display On-Screen-Keyboard, and type your  
password, then touch [OK].  
Close the QA Mode screen  
Touch [OK].  
When [OK] is not visible on the screen  
If [OK] is not displayed on the screen, touch the  
button at the bottom part of the  
screen (CXDI System Software Version 5.1 or later only).  
– 16 –  
3.QA Mode Settings  
3.2 Changing DWT ENHANCE. Tab  
Set the DWT Edge Enhancement effective  
1
Touch [DWT EDGE ENHANCE.] to display the parameters. The appearance of the but-  
ton switches over between the highlight (in white outline characters against a colored  
background) and normal display each time you touch the button. The parameters are  
available when the button is displayed in highlight.  
DWT ENHANCE. Screen with Parameters  
Set the EFFECT parameter  
2
Touch the  
or  
button, and set the value within the range between 1 to 20.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the EFFECT parameter, refer to the step 2 in 2.2 Setting DWT  
NOTE: If the EFFECT parameter is set to an excessive value, artifacts may occur in  
the image, or the effective data of the exposure image may be damaged.  
Check the output of exposure image, and if the results of enhancement  
appear to be too strong, either set the parameter to a smaller value, or set the  
DWT Edge Enhancement not effective.  
Continued on the following page >>  
– 17 –  
 
3.QA Mode Settings  
Display the MORE window  
3
4
Touch [MORE] to open the window.  
FREQUENCY  
BASE Button  
DENSITYBASE  
Button  
MORE Window  
Display the FREQUENCY BASE window  
Touch the FREQUENCY BASE button to open the window.  
For details of the FREQUENCY BASE parameter, refer to the step 3 in 2.2 Setting  
FREQUENCY BASE Window  
Select the FREQUENCY BASE parameter  
5
Touch the desired Frequency Base button.  
The parameter is selected for the Frequency Base, and the FREQUENCY BASE window  
is closed.  
Touch the  
or  
button to display the buttons that are not currently visible.  
– 18 –  
3.QA Mode Settings  
Representation of the enhancement degree on a bar graph  
After the Frequency Base is set, a bar graph is displayed at the top-right of the screen  
to illustrate the comparisons with the frequency bands and degree of enhancement.  
The horizontal axis labeled with Lv represents the frequency band, indicating the  
lower frequency with a larger value. The vertical axis represents the degree of  
enhancement, indicating the stronger degree of enhancement with a larger value.  
Strong  
1.0  
Degree 0.5  
Weak  
0.0  
Lv1  
Lv2  
Lv3  
Frequency  
Lv4  
Lv5  
Low  
High  
Bar Graph of Enhancement (Frequency Base)  
Display the DENSITY BASE window  
6
Touch the DENSITY BASE button to open the window.  
For details of the DENSITY BASE parameter, refer to the step 5 in 2.2 Setting DWT  
DENSITY BASE Window  
Continued on the following page >>  
– 19 –  
3.QA Mode Settings  
Select the DENSITY BASE parameter  
7
Touch the desired Density Base button.  
The parameter is selected for the Density Base, and the DENSITY BASE window is  
closed.  
Representation of the enhancement degree on a line graph  
After the Density Base is set, a line graph is displayed at the top-right of the screen to  
illustrate the comparisons with density and the degree of enhancement.  
The horizontal axis represents density, and the vertical axis represents the degree of  
enhancement in each density, indicating the stronger degree of enhancement with a  
larger value.  
Strong  
1.0  
Degree  
0.0  
Weak  
-0.5  
0.2 0.8  
3.2  
Density  
Line Graph of Enhancement (Density Base)  
Set the settings valid, and close the MORE window  
8
Touch [OK].  
– 20 –  
3.QA Mode Settings  
Switching the display of the graph  
Touch the graph area to switch over the Frequency Base Graph (bar graph) and Density  
Base graph (line graph).  
.
Actual processing shall not be performed unless the DWT Edge Enhancement is  
effective, although the graph is displayed on the screen.  
Frequency Base Graph (Bar Graph)  
Density Base Graph (Line Graph)  
– 21 –  
3.QA Mode Settings  
3.3 Changing DWT DEP Tab  
3.3.1 Changing DWT DEP for High-Density Field  
Set the DWT DEP for the High-Density Field effective  
1
Touch [HIGH DENS.] to display the parameters. The appearance of the button switches  
over between the highlight (in white outline characters against a colored background)  
and normal display each time you touch the button. The parameters are available when  
the button is displayed in highlight.  
DWT DEP Screen with Parameters of HIGH DENS.  
Representation of DWT DEP on a graph  
A blue curve is always displayed on a graph, and when HIGH-DENS. or LOW-  
DENS. is effective, a white curve is added.  
The blue curve represents the tone curve selected on the LUT tab, and the white curve  
represents the tone curve combining the blue and the DWT DEP tone curves.  
In other words, when either of HIGH-DENS. or LOW-DENS. is effective, the  
original tone curve compensation and the DWT DEP tone curve compensation are  
performed at the same time.  
Set the STARTING DENSITY parameter of the High-Density Field  
2
Touch the  
or  
button, and set the value within the range between 0 to 30.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 2 in 2.3.1 Setting DWT DEP for High-  
– 22 –  
   
3.QA Mode Settings  
Display the MORE window  
3
Touch [MORE] to open the window.  
MORE Window  
Set the HIGH WEIGHT parameter  
4
5
Touch the  
or  
button, and set the value within the range between 0 to 20.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 3 in 2.3.1 Setting DWT DEP for High-  
Set the HIGH EFFECT parameter  
Touch the  
or  
button, and set the value within the range between 0 to 10.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 4 in 2.3.1 Setting DWT DEP for High-  
NOTE: If the HIGH EFFECT parameter is set to an excessive value, artifacts may  
occur, and the effective data of the exposure image may be damaged.  
Check the exposure image, and if the results of compression appear to be too  
strong, either set the parameter to a smaller value, or set the DWT DEP not  
effective.  
Set the settings valid, and close the MORE window  
6
Touch [OK].  
– 23 –  
3.QA Mode Settings  
3.3.2 Changing DWT DEP for Low-Density Field  
Set the DWT DEP for the Low-Density Field effective  
1
Touch [LOW DENS.] to display the parameters. The appearance of the button switches  
over between the highlight (in white outline characters against a colored background)  
and normal display each time you touch the button. The parameters are available when  
the button is displayed in highlight.  
DWT DEP Screen with Parameters of HIGH and LOW DENS.  
Representation of DWT DEP on a graph  
A blue curve is always displayed on the graph, and when HIGH-DENS. or LOW-  
DENS. is effective, a white curve is added.  
The blue curve represents the tone curve selected on the LUT tab, and the white curve  
represents the tone curve combining the blue and the DWT DEP tone curves.  
In other words, when either of HIGH-DENS. or LOW-DENS. is effective, the  
original tone curve compensation and the DWT DEP torn curve compensation are  
performed at the same time.  
Set the STARTING DENSITY parameter of the Low-Density Field  
2
Touch the  
or  
button, and set the value within the range between 0 to 30 range.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 2 in 2.3.2 Setting DWT DEP for Low-  
– 24 –  
 
3.QA Mode Settings  
Display the MORE window  
3
Touch [MORE] to open the window.  
MORE Window  
Set the LOW WEIGHT parameter  
4
5
Touch the  
or  
button, and set the value within the range between 0 to 20.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 3 in 2.3.2 Setting DWT DEP for Low-  
Set the LOW EFFECT parameter  
Touch the  
or  
button, and set the value within the range between 0 to 10.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 4 in 2.3.2 Setting DWT DEP for Low-  
NOTE: If the LOW EFFECT parameter is set to an excessive value, artifacts may  
occur, and the effective data of the exposure image may be damaged.  
Check the exposure image, and if the results of compression appear to be too  
strong, either set the parameter to a smaller value, or set the DWT DEP not  
effective.  
Set the settings valid, and close the MORE window  
6
Touch [OK].  
– 25 –  
3.QA Mode Settings  
3.4 Changing DWT Noise R. Tab  
Set the DWT Noise Reduction effective  
1
Touch [NOISE REDUCTION] to display the parameters. The appearance of the button  
switches over between the highlight (in white outline characters against a colored back-  
ground) and normal display each time you touch the button. The parameters are available  
when the button is displayed in highlight.  
DWT NOISE R. Screen with Parameters  
Set the EFFECT parameter  
2
Touch the  
or  
button, and set the value within the range between 1 to 10.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 2 in 2.4 Setting DWT NOISE R. Tab (→  
P.13).  
NOTE: If the EFFECT parameter is set to an excessive value, artifacts may occur,  
and the effective data of the exposure image may be damaged.  
Check the output of exposure image, and if the results of noise reduction  
appear to be too strong, either set the parameter to a smaller value, or set the  
DWT Noise Reduction not effective.  
Set the PROCESSING UPPER LIMIT parameter  
3
Touch the  
or  
button, and set the value within the range between 0.2 to 3.2.  
The value on the left is the setting saved previously, and the value on the right is the cur-  
rent setting.  
For details of the parameter, refer to the step 3 in 2.4 Setting DWT NOISE R. Tab (→  
P.13).  
– 26 –  
 
4. QA Parameters  
When MLT(F) frequency processing is selected, the QA parameters (%IP_PARAM%) in Anno-  
tation are displayed in the format below.  
REX680 Q1 E5dA D25,10,10,10,10,10 N5,5 GCS16,10  
R
7
RT+90 Z0 C0  
10  
M2,1,2  
11  
1
2
3
4
5
6
8
9
n stands for the numeric value, character or symbol displayed on Annotation.  
1 REX  
The parameter is displayed as follows:  
REXn  
If LUT is set to REX ADJUST for x-ray exposure, F-REX is displayed.  
2 Frequency Processing Mode  
If MLT (F) FREQUENCY is selected as the Frequency Processing Mode, Q1 is  
displayed. Q0 is displayed for STD. FREQUENCY, and Q2 displayed for MLT (M)  
FREQUENCY. For other QA parameters displayed when the mode other than MLT  
(F) Frequency Processing is selected, please refer to the respective manuals.  
3 DWT Edge Enhancement  
The parameters are displayed as follows:  
En (EFFECT) n (FREQUENCY BASE, represented with the alphabet on the  
button) n (DENSITY BASE, represented with the alphabet on the button)  
If the DWT Edge Enhancement is not effective, nothing is displayed.  
The display values correspond to the actual values as shown in the following table:  
Effect  
Display Value  
1..................................................................................20  
Effect  
Low.....................................................................................High  
4 DWT DEP  
The parameters are displayed as follows:  
Dn (STARTING DENSITY of High-Density Field), n (DEP WEIGHT of High-  
Density Field), n (DEP EFFECT of High-Density Field), n (STARTING  
DENSITY of Low-Density Field), n (DEP WEIGHT of Low-Density Field), n  
(DEP EFFECT of Low-Density Field)  
If the DWT DEP is not effective, nothing is displayed.  
If only the High-Density Field is not effective, * is displayed instead of the  
parameters (D*, 10, 10, 10), and if only the Low-Density Field is not effective, * is  
displayed instead of the parameters (D25, 10, 10, *).  
The display values correspond to the actual values as shown in the following tables  
(the values for DEP EFFECT are omitted):  
Continued on the following page >>  
– 27 –  
 
4.QA Parameters  
STARING DENSITY (High-Density and Low-Density Fields)  
Display Value  
0
1
2
3
4
5
6
7
8
9
Density  
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1  
Display Value  
Density  
10 11 12 13 14 15 16 17 18 19  
1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1  
Display Value  
Density  
20 21 22 23 24 25 26 27 28 29 30  
2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2  
DEP WEIGHT (High-Density and Low-Density Fields)  
Display Value  
Degree  
0
1
2
3
4
5
6
7
8
9
1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55  
Display Value  
Degree  
10 11 12 13 14 15 16 17 18 19 20  
0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00  
5 DWT Noise Reduction  
The parameters are displayed as follows:  
Nn (EFFECT), n (PROCESSING UPPER LIMIT)  
If the DWT Noise Reduction is not effective, nothing is displayed.  
6 LUT Parameters  
The parameters are displayed as follows:  
Gn (CURVE SHAPE) n (BRIGHTNESS), n (CONTRAST)  
The Curve Shapes are represented by the following symbols respectively:  
CS: CHEST, SS: STAN. CONTRAST, LI: LINEAR, IL: INV. LINEAR,  
BS: BONE #1, GS: BONE #2  
The display values correspond to the actual values as shown in the following table  
(the values for CONTRAST are omitted):  
BRIGHTNESS  
Display Value  
Density  
1
2
3
4
5
6
7
8
9
10  
0.3  
0.4  
0.5  
0.6  
0.7  
0.8  
0.9  
1.0  
1.1  
1.2  
Display Value  
Density  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
1.3  
1.4  
1.5  
1.6  
1.7  
1.8  
1.9  
2.0  
2.1  
2.2  
Display Value  
Density  
21  
22  
23  
24  
25  
26  
27  
28  
29  
2.3  
2.4  
2.5  
2.6  
2.7  
2.8  
2.9  
3.0  
3.1  
7 Flip  
Either or both of the following parameters is/are displayed:  
R (Flip Horizontal), U (Flip Vertical)  
If image is not flipped, nothing is displayed.  
8 Rotate  
The parameter is displayed as follows:  
RTn (Rotate Angle)  
The degree of rotation is available from +90, -90, +180.  
If image is not rotated, nothing is displayed.  
– 28 –  
4.QA Parameters  
9 Suppress Grid Processing  
One of the following parameters is displayed:  
Z0 (No grid stripe is detected), Z1 (Grid stripes are suppressed), Z* (Processing is  
not determined yet)  
If the Grid Reduction Processing is not effective, nothing is displayed.  
10 High-Density Clipping Processing (HIGH IN. CLIPPING)  
One of the following parameters is displayed:  
C0 (Clipping is not performed), C1 (Clipping is performed), C* (Processing is not  
determined yet)  
If the High-Density Clipping Processing is not effective, nothing is displayed.  
11 Dose-Depend Processing (D. DEPEND MTF IMP)  
One of the following parameters is displayed:  
M0 (Processing is not performed), M1 (Processing is performed in the fix mode),  
M2,n,n (Processing is performed in the dose dependent mode)  
The parameters for M2 are displayed as follows:  
M2, n (FILTER TYPE Index), n (INTENSITY Index)  
The display values correspond to the parts of the body as shown in the following  
table (the values for INTENSITY are omitted):  
FILTER TYPE  
Display Value  
1
2
3
4
5
6
7
Abdo-  
men  
Cervical Thoracic  
vertebrae vertebra  
Body Part  
Chest  
Skull  
Lumbar Limbs  
– 29 –  
CANON INC. Medical Equipment Group  
30-2, Shimomaruko 3-chome, Ohta-ku, Tokyo, Japan  
Telephone: (81)-3-3758-2111  
CANON U.S.A., INC.  
CANON MEDICAL SYSTEMS  
15955 Alton Parkway, Irvine, CA 92618-3616, U.S.A.  
Telephone: (1)-949-753-4160  
CANON EUROPA N.V. Medical Products Division  
Bovenkerkerweg 59-61, 1185 XB Amstelveen, The Netherlands  
Telephone: (31)-20-545-8926  
PUB. L-IE-4081F  

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