
RadiCS
Chapter 10 Information
85
English
Cautions
AAPM constancy testing has 3 types, tests that monitor users perform daily, tests that medical
physicists perform or QC (quality control) technologists perform under their instructions monthly /
quarterly, and tests that medical physicists perform annually. RadiCS is mainly intended for constancy
testing of the second type, but pattern checks can be performed for all three types of testing.
AAPM has an item to measure geometrical distortion but RadiForce series monitors do not need to
be measured because it meets the requested specification. However, non-RadiForce monitors may be
used. Therefore, the pattern check has patterns and checkpoints for geometrical distortion.
ACR
RadiCS Setup
Acceptance Test Constancy Test
Pattern Check Black
TG18-QC
TG18-AD
TG18-UN80
TG18-AFC
TG18-CT
White (reversed Black)
Black
TG18-QC
TG18-AD
TG18-UN80
TG18-AFC
White (reversed Black)
Luminance
Check
L’max/L’min > 250
L’max/L’min < 650
L’max > 450 cd/m
2
Lamb < Lmin/1.5
L’max/L’min > 250
L’max/L’min < 650
L’max > 450 cd/m
2
Lamb < Lmin/1.5
Grayscale Check Target Error rate < 10 % of GSDF Target Error rate < 10 % of GSDF
Uniformity Grayscale: 204, 26
(Lmax-Lmin)/(Lmax+Lmin) X 200 <
30%
Grayscale: 204
Δ
(u’, v’) < 0.010
Grayscale: 204, 26
(Lmax-Lmin)/(Lmax+Lmin) X 200 <
30%
Grayscale: 204
Δ
(u’, v’) < 0.010
Multiple Monitors Grayscale: 204
Δ
(u’, v’) < 0.010
Grayscale: 204
Δ
(u’, v’) < 0.010
Correlation Between ACR and RadiCS
Pattern Check
The test patterns presented in ACR are TG18-AFC, TG18-QC Cx and line pair patterns only. These
are considered insufficient as visual tests, so RadiCS is set for the same inspection content as AAPM.
See the AAPM item for details of the correlation with RadiCS.
Luminance Check
Except for Lamb < Lmin / 1.5, ACR includes an equality sign in each judgment condition but RadiCS
does not.
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