A phantom-based evaluation of three commercially available patient organ shields for computed tomography X-ray examinations in diagnostic radiology
A phantom-based evaluation of three commercially available patient organ shields for computed tomography X-ray examinations in diagnostic radiology
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DOI：
10.1093/rpd/ncs327
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发表时间：
2013-07-01
影响因子：
1
通讯作者：
Loader, Robert
中科院分区：
文献类型：
--
作者：
Huggett, Jamie;Mukonoweshuro, William;Loader, Robert
评价了用于计算机断层扫描（CT）检查的三种市售平面内患者器官屏蔽（钡眼、铋眼和铋乳房），以确定其剂量降低的有效性。使用固定在京都CT躯干体模上的金属氧化物半导体场效应晶体管剂量计测量吸收剂量。由经验丰富的放射科医生将所得图像与减去屏蔽的图像进行目视比较。钡眼、铋眼和铋乳房屏蔽分别实现了约21、38和50的剂量减少，但代价是增加了图像噪声和条纹伪影。屏蔽图像产生不同程度的图像伪影，特别是眼罩造成的伪影。测得的剂量减少量与屏蔽件制造商所述的潜在剂量节省量不一致。当评价乳房防护罩时，通过简单地降低X射线管电流，在没有防护罩诱导伪影的情况下实现了类似的剂量降低。
Three commercially available in-plane patient organ shields (barium eye, bismuth eye and bismuth breast) for computed tomography (CT) examinations were evaluated to determine their effectiveness for dose reduction. Absorbed doses were measured using metal oxide semiconductor field effect transistor dosemeters fastened to a Kyoto CT Torso phantom. Resultant images were visually compared with those minus shielding by an experienced radiologist. Approximate dose reductions of 21, 38 and 50 were achieved by the barium eye, bismuth eye and bismuth breast shields, respectively, at a cost of increased image noise and streak artefacts. Shielded images produced varied levels of image artefact, particularly those resulting from the eye shields. Measured dose reductions were not consistent with the potential dose savings stated by the manufacturers of the shields. When evaluating the breast shield, similar dose reduction was achieved without shield-induced artefact by simply reducing the X-ray tube current.