User`s manual

RadiCS
Chapter 10 Information
92
English
Uniformity Check
Although JESRA includes an equality sign, each judgement condition in RadiCS does not.
In the standard, the uniformity is checked with the TG18-UN80 patterns. However, since these
patterns have the aspect ratio of 1:1, they are not applicable directly. RadiCS displays two windows
(grayscale: 204) with the size of 10 % of the whole display area at the center and a corner of the
screen. It then measures the luminance at the center of both windows.
Sensors
JESRA permits the use of both noncontact and contact type measuring devices. For a noncontact
type measuring device, since RadiCS measures the luminance without blocking the ambient light, you
should use a dark room or a cylinder to block the ambient light. Any sensors can be used to perform
both the acceptance tests and the constancy tests.
Multiple Monitors
JESRA includes a determination for multiple monitors, but by default RadiCS is set not to make
such a determination. If necessary, make settings as indicated in the table above. JESRA includes an
equality sign but RadiCS does not.
IPEM
RadiCS Setup
Acceptance Test Constancy Test
Pattern Check TG18-QC TG18-QC
Luminance
Check
L’max/L’min > 250
Δ
L’max < 20 %
Standard Value xxx cd/m
2
L’max/L’min > 250
Δ
L’max < 20 %
Standard Value xxx cd/m
2
Grayscale Check Target Error rate < 10 % of GSDF Target Error rate < 10 % of GSDF
Uniformity Grayscale: 128
(Lmax-Lmin)/(Lmax+Lmin) X 200 <
30%
Grayscale: 128
(Lmax-Lmin)/(Lmax+Lmin) X 200 <
30%
Multiple Monitors
Δ
L’max < 30% between multiple
monitors
Δ
L’min < 30% between multiple
monitors
Δ
L’max < 30% between multiple
monitors
Δ
L’min < 30% between multiple
monitors
Correlation Between IPEM and RadiCS
Pattern Check
The patterns used for IPEM are the same as those used for AAPM. RadiCS determines the properties
to be verified and independently prepares appropriate patterns for each resolution.
TG18-QC This is scaled to match the resolution.
Luminance Check
Maximum luminance and luminance ratio specified in IPEM correspond to L’max and L’max/L’min
used in RadiCS. The patterns G18-LN12-01 and TG18-LN12-18 are recommended for luminance
measurements, but RadiCS measures the luminance by displaying a window equivalent to 10%
of the display area in the center of the screen and changing its grayscale level to 0 and 255. IPEM
includes a judgment of
Δ
Lmin
≤
25%, but RadiCS does not. Make the settings as necessary although
the standard name will be “Custom”. This provides a more accurate measurement. IPEM includes an
equality sign but RadiCS does not.