Wallberg H, Alveryd A, Carlsson K
Acta Radiol Diagn (Stockh). 1985 Jul-Aug;26(4):417-24. doi: 10.1177/028418518502600409.
Experiments have shown that the light recorded in diaphanography covers approximately the wavelength region of 645 to 900 nm. No significant change in image quality was noted by changing the camera distance between 10 and 25 cm and the light source aperture between 5 and 30 mm. Experiments using polarising filters indicated that the breast is optically isotropic; therefore the results cannot be improved by using polarising filters. In a comparison of various films. Kodak Ektachrome Infrared Film gave the best results. No degradation or variation in image quality was observed when different batches were compared or when the exposed film was stored for 3 weeks before processing. The exposure level is a critical factor and a series of 3 images is needed for optimum evaluation of diaphanograms. The experiments indicate that diaphanography gives consistent results.
实验表明，透照成像记录的光大约覆盖645至900纳米的波长范围。在10至25厘米的相机距离以及5至30毫米的光源孔径范围内变化时，未观察到图像质量有显著变化。使用偏振滤光片的实验表明，乳腺在光学上是各向同性的；因此，使用偏振滤光片无法改善结果。在对各种胶片的比较中，柯达爱克泰克罗姆红外胶片效果最佳。比较不同批次或在冲洗前将曝光后的胶片保存3周时，均未观察到图像质量下降或变化。曝光水平是一个关键因素，为了对透照图像进行最佳评估，需要一系列3张图像。实验表明，透照成像能给出一致的结果。
