Amorphous silicon, flat-panel, X-ray detector versus storage phosphor-based computed radiography:: Contrast-detail phantom study at different tube voltages and detector entrance doses

被引:24
作者
Hamer, OW [1 ]
Völk, M [1 ]
Zorger, N [1 ]
Feuerbach, S [1 ]
Strotzer, M [1 ]
机构
[1] Univ Hosp Regensburg, Dept Diagnost Radiol, D-93053 Regensburg, Germany
关键词
flat panel detector; radiography; storage phosphor; comparative studies; contrast-detail study;
D O I
10.1097/00004424-200304000-00005
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
RATIONALE AND OBJECTIVES. Evaluation of the contrast-detail performance of an active-matrix flat-panel x-ray detector in comparison with a storage phosphor system with special regard to the potential of dose reduction. METHODS. A digital x-ray detector based on cesium iodide (CsI) and amorphous silicon (a-Si) technology was compared with a fifth-generation storage phosphor system. A lucite plate with 36 drilled holes of varying diameters and depths was used as contrast-detail phantom. At 45 kVp, 70 kVp, and 113 kVp, images at 8 different detector entrance doses ranging between 0.3 muGy and 40 muGy were obtained. On soft-copy displays, 3 masked observers evaluated the detectability of each aperture in each image according to a 5-point scale. The mean sum scores of corresponding images were compared. RESULTS. For all tube voltages and detector entrance doses, the images obtained with the CsI/a-Si detector resulted in better observer contrast-detail performance as compared with the images of the storage phosphor system. The CsI/a-Si system allowed a calculated dose reduction of 39% at 45 kVp, 68% at 70 kVp, and 81% at 113 kVp as compared with the storage phosphor system, without loss of contrast-detail detectability. CONCLUSIONS. Under the conditions of the chosen experimental design, the CsI/a-Si system provided a superior contrast-detail performance as compared with the storage phosphor system. The potential of dose reduction increased with rising tube voltage.
引用
收藏
页码:212 / 220
页数:9
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