Canon MLT (F) User 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.
User’s Manual
MLT (F)
CXDI Image Processing Software

Please Note
1. In no event will Canon be liable for direct or indirect consequential damage arising out of the use of this
product. Canon will not be liable for loss of image data due to any reason.
2. Please have this product installed by Canon representative or distributor.
3. Canon reserves the right to change the specifications of the product without prior notice.
© CANON INC. 2008
All rights reserved.
Under copyright laws, this manual may not be copied, in whole or in part, without the written consent of
Canon.

Contents
1. Overview ......................................................................................1
1.1 About MLT (F) .......................................................................................1
1.2 Available Functions of MLT (F) .............................................................2
2. Edit Exposure Mode Settings ......................................................3
2.1 Procedures to Edit Exposure Mode .......................................................3
2.2 Setting DWT ENHANCE. Tab ...............................................................7
2.3 Setting DWT DEP Tab ........................................................................10
2.3.1 Setting DWT DEP for High-Density Field .........................................................10
2.3.2 Setting DWT DEP for Low-Density Field .........................................................11
2.4 Setting DWT NOISE R. Tab ................................................................13
3. QA Mode Settings ......................................................................14
3.1 Procedures to Change Parameters .....................................................14
3.2 Changing DWT ENHANCE. Tab .........................................................17
3.3 Changing DWT DEP Tab ....................................................................22
3.3.1 Changing DWT DEP for High-Density Field ....................................................22
3.3.2 Changing DWT DEP for Low-Density Field .....................................................24
3.4 Changing DWT Noise R. Tab ..............................................................26
4. QA Parameters ..........................................................................27

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: For details of the EFFECT parameter, refer to the step 2 in 2.2 Setting DWT ENHANCE. Tab
(→P.7)
Content: 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 –
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.Overview
– 2 –
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).
DWT DEP*2 (→P.10)
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.
*1 This is an abbreviation for Discrete Wavelet Transform. This method of image
processing is also called Multi-Frequency Processing.
*2 This is an abbreviation for Display Enhancement Processing. This method of
image processing is also called Dynamic Range Compression Processing.
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.

Continued on the following page >>
– 3 –
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
1Display the Edit Exposure Mode screen
On the Exposure screen, touch the followings:
[SYSTEM] > [EDIT EXPOSURE MODE].
Edit Exposure Mode Screen
2Select the Sensor Unit
If two or more sensor units are being used in the system, touch the Sensor Unit button,
then select the Sensor Unit.
3Select the Category tab
If eight or more categories are registered in the system, touch the or button to dis-
play the Category tabs that are not currently visible.
Sensor Unit
Button
Button
Button
Category Tab Exposure Mode

2.Edit Exposure Mode Settings
– 4 –
4Select the Exposure Mode
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)
5Display the next page
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.

Continued on the following page >>
2.Edit Exposure Mode Settings
– 5 –
6Select MLT (F) FREQUENCY
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 Window
7Select the tab
Touch the desired tab from among three tabs: DWT ENHANCE., DWT DEP, DWT
NOISE R.
DWT ENHANCE. Screen
8Set the parameters
Set the parameters provided with the selected tab, referring to the corresponding descrip-
tions; 2.2 Setting DWT ENHANCE. Tab (→P.7), 2.3 Setting DWT DEP Tab (→
P.10), 2.4 Setting DWT NOISE R. Tab (→P.13).
Frequency
Processing
Mode
Button

2.Edit Exposure Mode Settings
– 6 –
9Save the parameters
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].

Continued on the following page >>
2.Edit Exposure Mode Settings
– 7 –
2.2 Setting DWT ENHANCE. Tab
1Set the DWT Edge Enhancement effective
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.
DWT ENHANCE. Screen with Parameters
2Set the EFFECT parameter
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.
FREQUENCY
BASE Button
DENSITY
BASE Button

2.Edit Exposure Mode Settings
– 8 –
3Display the FREQUENCY BASE window
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:
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 Aor 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 Aor a.
4Set the FREQUENCY BASE parameter
Touch the desired Frequency Base button.
The parameter is set for the Frequency Base selected, and the FREQUENCY BASE win-
dow is closed.
Display of Button Remarks
Blue Bar Graph
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.
Green Bar Graph Enhances the structures in the specific frequency band stronger
than the structure in other frequency bands.

– 9 –
2.Edit Exposure Mode Settings
5Display the DENSITY BASE window
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.
6Set 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.

2.Edit Exposure Mode Settings
– 10 –
2.3 Setting DWT DEP Tab
2.3.1 Setting DWT DEP for High-Density Field
1Set the DWT DEP for the High-Density Field effective
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.
2Set the STARTING DENSITY parameter of the High-Density Field
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
3Set 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.
Settingvalue 01234567891011121314
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
Settingvalue 15161718192021222324252627282930
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

Continued on the following page >>
2.Edit Exposure Mode Settings
– 11 –
4Set the DEP EFFECT parameter of the High-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 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 tobe 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
1Set the DWT DEP for the Low-Density Field effective
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.

2.Edit Exposure Mode Settings
– 12 –
2Set the STARTING DENSITY parameter of the Low-Density Field
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
3Set the DEP WEIGHT parameters of the Low-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 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.
4Set 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 tobe too
strong, either set the parameter to a smaller value, or set the DWT DEP not
effective.
Settingvalue 01234567891011121314
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
Settingvalue 15161718192021222324252627282930
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

– 13 –
2.Edit Exposure Mode Settings
2.4 Setting DWT NOISE R. Tab
1Set the DWT Noise Reduction effective
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
2Set the EFFECT parameter
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.
3Set the PROCESSING UPPER LIMIT parameter
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.

– 14 –
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.
1Display the QA Mode screen
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.