Burke P, Luparia E, Frigerio A, Marra V, Milani R, Di Benedetto A, Simeone F
Servizio di Radiologia, Ospedale S. Anna, USSL IX, Torino.
Radiol Med. 1994 Sep;88(3):295-300.
The value of rhodium filtration in mammography was compared with that of conventional molybdenum; dosimetric and qualitative tests were performed on a phantom and in vivo on informed and consenting patients. Phantom dosimetric tests confirmed a dose reduction with rhodium filtration changing according to thickness and primary beam energy. With rhodium filtration the dose decreased by 40% on the average topping 67% in breasts thicker than 6.5 cm. No significant differences were observed between rhodium and molybdenum filtration in clinical and phantom qualitative tests. Four radiologists--three of them in double blind--studied 29 mammograms repeated in the same technical setting and expressed a very slight preference for molybdenum also in thick and dense breasts. The slight preference was not based on higher diagnostic yield and therefore clinically irrelevant. Preferences appeared to be subjective, differing from one radiologist to another. In conclusion, the authors suggest the use of rhodium filtration in thick breasts because of the lower administered dose and of shorter exposure time with direct magnification.
在乳腺摄影中，将铑滤过与传统钼滤过的价值进行了比较；在体模上以及在获得知情同意的患者体内进行了剂量测定和定性测试。体模剂量测定测试证实，随着铑滤过根据厚度和初级射线能量的变化，剂量会降低。使用铑滤过时，平均剂量降低40%，在厚度超过6.5厘米的乳房中剂量降低超过67%。在临床和体模定性测试中，未观察到铑滤过和钼滤过之间存在显著差异。四位放射科医生——其中三位采用双盲法——研究了在相同技术条件下重复拍摄的29张乳腺造影片，即使在乳房厚且致密的情况下，他们也对钼滤过表现出非常轻微的偏好。这种轻微偏好并非基于更高的诊断率，因此在临床上并无关联。偏好似乎是主观的，不同放射科医生之间存在差异。总之，作者建议在乳房较厚的情况下使用铑滤过，因为其给药剂量较低且直接放大时曝光时间较短。
