Persliden J, Fransson V, Vitak B, Fagerberg G
Department of Radiation Physics, Faculty of Health Sciences, Linköping University, Sweden.
Acta Radiol. 1993 Jul;34(4):351-5.
A film intended for mammography (Kodak SO 155 MRH-1) was tested and compared to one (Kodak SO 177 Ortho M) used earlier. Both films including the cassette could resolve 20 lp/mm. For a processing time of 90 s the new film gave the same overall image quality and irradiation dose to the breast as the old system. If, instead, the processing time was increased to 150 s, a 43% reduction in kerma could be attained with the new film. With a developing temperature of 36 degrees C and 150 s processing time, the noise is clinically acceptable. A nonparametric test showed no significant difference between the 2 films on the 0.01 level. At an X-ray tube potential difference of 25 kV, the mean absorbed dose to a 4.5-cm-thick breast was reduced from 1.7 mGy with the old combination to 1.0 mGy with the new one. The measurements were made with a moving grid.
对一张用于乳腺摄影的胶片（柯达SO 155 MRH - 1）进行了测试，并与之前使用的一张胶片（柯达SO 177 Ortho M）作比较。两张胶片包括暗盒都能分辨20线对/毫米。在90秒的显影时间下，新胶片给出的乳腺整体图像质量和照射剂量与旧系统相同。相反，如果将显影时间增加到150秒，使用新胶片可使比释动能降低43%。在36摄氏度的显影温度和150秒的显影时间下，噪声在临床上是可接受的。一项非参数检验显示，在0.01水平上，这两张胶片之间没有显著差异。在X射线管电势差为25 kV时，4.5厘米厚乳腺的平均吸收剂量从旧组合的1.7毫戈瑞降至新组合的1.0毫戈瑞。测量是使用活动滤线栅进行的。
