Quality Assurance in Digital Radiology Test Device DIGI-13
 
Test device for quality tests (e.g. for acceptance tests according to DIN V 6868-58 and constancy tests according to DIN 6868-13) of
projection radiography systems with digital image receptors like semiconductor detectors or storage screens
 
By using the test device you can determine simultaneously:
■ Signal standarization and dose indicator (Image receptor dose KB, S-value or LgM-value (log. median) on fi lm or monitor
■ Homogeneity (optical density resp. luminance)1)
■ Spatial resolution
■ Contrast resolution
■ Alignment of light fi eld and the fi eld of useful beam
■ Image scale
■ Artifacts





Construction of the test device DIGI-13
Basic copper plate (300 x 300 x 1.0 mm) with

■ Dynamic step wedge, made of copper ➀, with different radiation absorption, 7 steps ascending: 0.00, 0.30, 0.65.
1.00, 1.40, 1.85 and 2.3 mm Cu, for controlling the dynamic range

■ Low contrast objects, made of aluminium disks ➁, with a diameter of 10 mm, producing a contrast of 0.8 %,
1.2 %, 2.0 %, 2.8 % , 4.0 % and 5.6 % at 70 kV, for determination of contrast resolution

■ Resolution test (lead foil) ➂, 0.6 – 5.0 lp/mm, 45° rotated, for checking spatial resolution

■ Marked areas for signal standarization and homogenity check ➃

■ Alignment marks for different cassette sizes ➄