Variation in CR imaging plate readers.

This study investigated computed radiography (CR) image processing to determine whether variation exists within and among CR imaging plate readers. Photostimulable imaging plates were exposed using a phantom test tool and processed in 4 CR readers located in diverse settings in an urban academic medical center. Research results indicate daily variation of S-numbers within individual CR readers did not exceed tolerance limits, although over the 3-week study period, evidence of S-number variation within individual CR readers was mixed. In addition, S-number variability among multiple CR readers was found to be statistically significant. Although the cause of the variability remains unknown, evidence of variability among multiple CR readers indicates a need for systematic quality control.