Kimme-Smith C, Bassett L W, Gold R H, Roe D, Orr J
Department of Radiological Sciences, UCLA School of Medicine 90024.
Radiology. 1987 Nov;165(2):313-8. doi: 10.1148/radiology.165.2.3310091.
Three test objects simulating different mammographic problems were imaged with a new low-dose dual-screen-dual-emulsion-film combination and a standard screen film combination, with and without a moving grid, at 28 and 32 kVp, and with 0.3- and 0.5-mm focal spots. The new combination reduced exposure by 50%, but it failed to equal the other combination in the depiction of simulated microcalcifications, even when a different brand of film-processing chemicals was used. Compared with the standard screen-film combination exposed without a grid, the new combination exposed with a grid resulted in a superior image of dense parenchyma without an increase in dose. Furthermore, when the exposure time was decreased by 25% (rather than 50%), dense breasts were imaged with greater penetration by the new combination. A clinical trial of the new combination in 200 patients showed prominent quantum mottle and reduced contrast in regions of dense parenchyma. In addition, the skin and subcutaneous tissue were often poorly depicted with both standard and high-intensity illumination.
使用一种新型低剂量双屏双乳剂胶片组合和标准屏片组合，在有和没有移动滤线栅的情况下，于28和32 kVp管电压以及使用0.3毫米和0.5毫米焦点的条件下，对模拟不同乳腺X线摄影问题的三个测试物体进行成像。新型组合使曝光量减少了50%，但即便使用不同品牌的胶片冲洗化学药剂，在模拟微钙化的显示方面仍无法与另一种组合相媲美。与未使用滤线栅曝光的标准屏片组合相比，使用滤线栅曝光的新型组合在不增加剂量的情况下能获得更优质的致密实质图像。此外，当曝光时间减少25%（而非50%）时，新型组合对致密乳房的成像穿透力更强。对200名患者使用新型组合进行的临床试验显示，存在明显的量子斑点，且致密实质区域的对比度降低。此外，在标准照明和高强度照明下，皮肤和皮下组织的显示往往都很差。
