User`s manual

RadiCS
Chapter 10 Information
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Correlation Between JESRA and RadiCS
Pattern Check
Since the test patterns used in JESRA have the aspect ratio of 1:1, they cannot be applied directly to
monitors. Thus, RadiCS determines necessary test patterns based on the inspection to be performed
and generates its own patterns corresponding to the monitor’s resolution.
TG18-QC Equivalent to the pattern with the same name in the standard. However, RadiCS-
specific scaling is performed in accordance with the monitor resolution.
TG18-UN80 A pattern solidly filled with white of grayscale 204. The pattern with the same
name in the JESRA has a square frame, but RadiCS does not have it because it
is not necessary for the visual inspection.
Clinical Image
and JIRA
CHEST-QC
(JESRA)
The original image is in the 4096 x 4096 DICOM format. Therefore, it is edited in
RadiCS, as described below.
1. The image is converted to an appropriate size in accordance with the
resolution of each monitor, so that the entire image can be displayed.
However, the aspect ratio of the original image remains unchanged. Note that
in RadiCS, the clinical image can be displayed in XGA on the system, but the
specification does not allow the image to be judged at this resolution.
2. In order to display locations to be judged, low-contrast circles are drawn on the
image to minimize obstruction to the judgment.
3. The image format has been changed from DICOM to BMP.
Luminance Check
In JESRA, the luminance measurement does not include the ambient luminance. In RadiCS, an
apostrophe (’) in the L’max, for example, indicates that it includes the ambient luminance. However,
entering the ambient luminance value as 0 cd/m
2
can effectively exclude the ambient luminance from
the luminance measurement.
Note that none of inequalities used in RadiCS includes an equality sign although every judgement
condition in JESRA includes it.
Performing the task setup defaults to the Lmax value at the calibration setting as the baseline value
of delta L’max.
Grayscale Check
In JESRA, the luminance measurement does not include the ambient luminance. In RadiCS, an
apostrophe (’) in the L’max, for example, indicates that it includes the ambient luminance. However,
entering the ambient luminance value as 0 cd/m
2
can effectively exclude the ambient luminance from
the luminance measurement.
The calculation method for this item is the same as the one for
κδ
. RadiCS describes the
specification of the grayscale as Target Error Rate < 15 % (or 30 %) of GSDF. Note that none of
inequalities used in RadiCS includes an equality sign.
This specification is provided as the judgement condition for DICOM Part 14 GSDF, so there is no
meaning to use this specification for other display functions. The number of measuring points is fixed
to 18 points and this value cannot be changed. (The number of data points will be 17 because the
result is presented as (JNDn+1-JNDn)/2.)