Abstract:
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Purpose: The purpose of this study was to compare images obtained with two different flat-panel X-ray detectors based on amorphous silicon technology with computed radiography and to evaluate the possibility of radiation dose reduction in thoracic radiography.
Methods and Materials: A contrast-detail phantom CDRAD type 2.0 was imaged with the flat-panel detector systems Revolution XQ/i (GE Medical Systems) and Vertix FD (Siemens) and a storage phosphor system ST-VI (Fuji) in combination with the X-ray unit Vertix RWG (Siemens) and the image reader FCR XG1 (Fuji). The images were taken at different dose levels with settings for thoracic radiography simulating speed classes from 200 to 800. Entrance surface dose was recorded for all images. Contrast detail curves and the contrast detail based image quality figure (IQF) were calculated. Lower IQFs correspond to better low contrast resolution. At each setting, three images were read by four independent observe
Results: At an entrance surface air kerma in front of the detector of 10 μGy the Revolution XQ/i shows an IQF of 23, the Vertix FD an IQF of 30 and the storage phosphor system's IQF was 43. At about 5 μGy the IQFs were 29 for XQ/i and 34 for the Vertix FD system. Storage phosphor system IQFs as high as for the flat panel systems were reached at signifiantly higher dose. The XQ/i dose seemed to be lower than the Vertix FD dose for the same image quality.
Conclusion: Flat-panel x-ray detector technology allows significant reduction in radiation dose compared with storage phosphor based thoracic radiography without loss of low contrast detectability.
Questions about this event email: kherman@gwdg.de
Hermann PhD, K,
Comparison of Low-Contrast Detectability between Two Different Digital Amorphous Silicon and a Storage Phosphor based Imaging System for Thoracic Radiography. Radiological Society of North America 2003 Scientific Assembly and Annual Meeting, November 30 - December 5, 2003 ,Chicago IL.
http://archive.rsna.org/2003/3104330.html
