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The constancy test for quality control of X-ray image processing devices was evaluated using long-term and continuous constancy test results. Control was set so that under specific imaging conditions, variation in exposure dose is within 20% from the base line and variation in system sensitivity (S-value) obtained from images scanned with imaging plate is within 40%. Controlling the exposure dose enabled adjustments of tube currents and organized exchanges of the X-ray tube. Controlling the S-value allowed adjustments from increase due to age as well as organized exchanges of the photomultiplier tube foundation of the computed radiography scanner when control range is rapidly exceeded. Results from long-term and continuous constancy tests were of extreme value in comprehending the condition of the device for early detection of abnormalities, and thus indicate the significance of constancy tests for quality control of image processing device.

Study of the Usefulness of the Constancy Tests in X-rays Image Processing Device by User