Mc Entee Mark F, Kinsella Catherine
A209 Diagnostic Imaging, UCD Health Sciences Centre, Belfield Dublin 4, Ireland.
Radiat Prot Dosimetry. 2010 Jun;139(4):539-45. doi: 10.1093/rpd/ncp291. Epub 2010 Jan 9.
This study compares dose and image quality during PA and AP radiography of the clavicle. The methodology involved a cadaver-based dose and image quality study. Results demonstrate a statistically significant 56.1 % (p <or= 0.001) and 56.5 % (p <or= 0.001) reductions to breast tissue and 62.3 % (p <or= 0.001) and 78 % (p <or= 0.001) reductions in the thyroid dose with employment of PA and PA15 caudal projections. Reductions of 28.5 % (p <or= 0.08) and 11.8 % (p <or= 0.12) in the doses to the eye were demonstrated for the PA. Differences in entrance-surface and exit doses were deemed non-significant. A 5.9 % (p <or= 0.39) reduction in overall image quality was seen with PA positioning. Reductions in image quality were evaluated to be non-significant at 95 % (AP vs PA (p <or= 0.06), AP15 degrees Vs PA15 degrees (p <or= 0.28). The current study demonstrated consistent significant dose reductions to the thyroid and breast when PA projection is chosen over the AP projection. The authors recommend the implementation of PA positioning for clavicle radiography.
本研究比较了锁骨后前位（PA）和前后位（AP）X线摄影时的剂量和图像质量。该方法涉及一项基于尸体的剂量和图像质量研究。结果表明，采用PA位和向尾侧倾斜15°的PA位投照时，乳腺组织剂量分别显著降低56.1%（p≤0.001）和56.5%（p≤0.001），甲状腺剂量分别显著降低62.3%（p≤0.001）和78%（p≤0.001）。PA位投照时，眼部剂量分别降低28.5%（p≤0.08）和11.8%（p≤0.12）。入射表面剂量和出射剂量的差异被认为无统计学意义。PA位投照时，整体图像质量下降5.9%（p≤0.39）。图像质量下降在95%的情况下被评估为无统计学意义（AP与PA相比（p≤0.06），向头侧倾斜15°的AP位与向尾侧倾斜15°的PA位相比（p≤0.28）。本研究表明，当选择PA位而非AP位进行锁骨X线摄影时，甲状腺和乳腺的剂量持续显著降低。作者建议在锁骨X线摄影中采用PA位投照。
