Wenz W, Buitrago-Téllez C, Mönig H, Niemeier R
Abteilung Röntgendiagnostik der Radiologischen Universitätsklinik, Albert-Ludwigs-Universität Freiburg.
Radiologe. 1993 Feb;33(2):95-101.
Inadequate exposure of analogue radiographs is reported in the literature to occur in 5-25% of cases. Therefore, the present study was performed to test whether selective image processing after digitization could reveal diagnostic details on underexposed radiographs. In addition, the minimal exposure values required for diagnostic purposes after adequate image processing were studied. Phantom studies, organ preparations and measurements of physical parameters with decreasing exposure values were performed. The detection of anatomic and pathologic (nondisplaced fracture lines, microcalcification and renal stones) structures were evaluated by 12 readers. Radiographs with exposure values 20-40% lower than "ideal" values can provide adequate diagnostic images after digital processing. The diagnostic information is significantly impaired with values under 50% of the correct exposure values. In conclusion, this method is adequate to save underexposed radiographs for diagnostic purposes and to avoid repeated examinations.
文献报道，在5%-25%的病例中会出现模拟X线片曝光不足的情况。因此，本研究旨在测试数字化后进行选择性图像处理是否能揭示曝光不足的X线片上的诊断细节。此外，还研究了经过适当图像处理后用于诊断目的所需的最小曝光值。进行了体模研究、器官标本制备以及随着曝光值降低对物理参数的测量。由12名阅片者对解剖结构和病理结构（无移位骨折线、微钙化和肾结石）的检测情况进行评估。曝光值比“理想”值低20%-40%的X线片在数字处理后可提供足够的诊断图像。当曝光值低于正确曝光值的50%时，诊断信息会显著受损。总之，该方法足以挽救曝光不足的X线片用于诊断目的，并避免重复检查。
