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Increasing source to image distance for AP pelvis imaging: impact on radiation dose and image quality

机译：AP骨盆成像的源到图像距离增加：对辐射剂量和图像质量的影响

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Aim - A quantative primary study to determine whether increasing source to image distance (SID), with and without the use of automatic exposure control (AEC) for antero-posterior (AP) pelvis imaging, reduces dose whilst still producing an image of diagnostic quality. Methods - Using a computed radiography (CR) system, an anthropomorphic pelvic phantom was positioned for an AP examination using the table bucky. SID was initially set at 110 cm, with tube potential set at a constant 75 kVp, with two outer chambers selected and a fine focal spot of 0.6 mm. SID was then varied from 90 cm to 140 cm with two exposures made at each 5 cm interval, one using the AEC and another with a constant 16 mAs derived from the initial exposure. Effective dose (E) and entrance surface dose (ESD) were calculated for each acquisition. Seven experienced observers blindly graded image quality using a 5-point Likert scale and 2 Alternative Forced Choice software. Signal-to-Noise Ratio (SNR) was calculated for comparison. For each acquisition, femoral head diameter was also measured for magnification indication. Results - Results demonstrated that when increasing SID from 110 cm to 140 cm, both E and ESD reduced by 3.7% and 17.3% respectively when using AEC and 50.13% and 41.79% respectively, when the constant mAs was used. No significant statistical (T-test) difference (p = 0.967) between image quality was detected when increasing SID, with an intra-observer correlation of 0.77 (95% confidence level). SNR reduced slightly for both AEC (38%) and no AEC (36%) with increasing SID. Conclusion- For CR, increasing SID significantly reduces both E and ESD for AP pelvis imaging without adversely affecting image quality.
机译：目的-一项定量的初步研究，以确定在不使用自动曝光控制（AEC）进行前后骨盆成像的情况下，是否增加源到图像的距离（SID）是否减少了剂量，同时仍然产生了诊断质量的图像。方法-使用计算机射线照相（CR）系统，将人造人骨盆体模放置在桌子上以进行AP检查。 SID最初设置为110 cm，管电势设置为恒定的75 kVp，选择了两个外腔，并具有0.6 mm的精细焦点。然后将SID从90 cm更改为140 cm，以每5 cm的间隔进行两次曝光，一次使用AEC，另一次使用源自初始曝光的恒定16 mAs。计算每次采集的有效剂量（E）和入射表面剂量（ESD）。七名经验丰富的观察者使用5点Likert量表和2个Alternative Forced Choice软件对图像质量进行盲目评分。计算信噪比（SNR）以进行比较。对于每次采集，还测量股骨头直径以指示放大倍数。结果-结果表明，当将SID从110 cm增加到140 cm时，使用AEC时E和ESD分别降低3.7％和17.3％，而使用恒定mAs时E和ESD分别降低50.13％和41.79％。当增加SID时，在图像质量之间未检测到显着的统计（T检验）差异（p = 0.967），观察者内部相关系数为0.77（95％置信度）。随着SID的增加，AEC（38％）和无AEC（36％）的SNR都会略有降低。结论-对于CR，增加SID可显着降低AP骨盆成像的E和ESD，而不会对图像质量产生不利影响。

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