X线照片质量的好坏,除X线胶片,增感屏,冲洗技术和投照位置等影响外,曝光条件选择正确与否也是十分重要的因素.欲获得优质照片,则要求每张X线胶片均接收到基本等同密度的感光量.因感光效应遵循P·E=K(VnmAssfz)/(r~2B Da)eμd X线剂量衰减规律为Ⅰ=BIoeμd.两者均以eμd为函数关系.故本余厚军,薛玉祥,王锡海...
Adiga,S.,Athreya - CLINICAL RADIOLOGY-EDINBURGH- 被引量: 16发表: 2014年 Efficacy and Radiation Exposure of Ultra-Low-Dose Chest CT at 100?kVp with Tin Filtration in CT-Guided Percutaneous Core Needle Biopsy for Small Pulmonary ... To prospectively investigate efficacy and radiation dose of ultr...
To determine the diagnostic capability of low-dose CT (50mAs) in comparison to standard-dose CT (150mAs). Fifty-nine consecutive patients underwent two non-contrast chest CT scans with different current-time products (50 and 150mAs at 120kVp) on a 64-detector row CT scanner. Three board ...
derived from a storage phosphor-based digital radiography system capable of 5 line pair/mm resolution at identical exposure factors (30 kVp, 250 mAs, 65... JW Oestmann,D Kopans,DA Hall,... - 《Investigative Radiology》 被引量: 118发表: 1988年 Practical Middleware for Massively Multiplayer Onl...
方法 选取下肢CTA病例120例,低kVp组,低mAs组各60例.低kVp组使用90 kVp,250 mAs,低mAs组使用120 kVp,150 mAs.记录两组病例扫描长度L,容积CT剂量指数(CTDIvol)及剂量长度乘积(DLP),计算有效剂量E值.测量腰3椎体水平图像信噪比(SNR),对比噪声比(CNR)以客观评价图像质量;双盲法主观评价下肢动脉后重组图像质量并...
Clinical RadiologyBroderick NJ, Long B, Dreesen RG, Cohen MD, Cory DA, Katz BP, et al. Phosphor plate computed radiography: Response to variation in mAs at fixed kVp in an animal model. Potential role in neonatal imaging. Clin Radiol. 1993;47(1):39-45....
Purpose To determine the diagnostic capability of low-dose CT (50 mAs) in comparison to standard-dose CT (150 mAs). Materials and methods Fifty-nine consecutive patients underwent two non-contrast chest CT scans with different current-time products (50 and 150 mAs at 120 kVp) on a 64-detec...
To determine the diagnostic capability of low-dose CT (50mAs) in comparison to standard-dose CT (150mAs). Fifty-nine consecutive patients underwent two non-contrast chest CT scans with different current-time products (50 and 150mAs at 120kVp) on a 64-detector row CT scanner. Three board ...