通过在脑部 CT 扫描中旋转机架来优化晶状体剂量：放射技师培训的潜在影响。

EYE LENS DOSE OPTIMIZATION THROUGH GANTRY TILTING IN BRAIN CT SCAN: THE POTENTIAL EFFECT OF THE RADIOLOGICAL TECHNOLOGISTS' TRAINING.

机构信息

Department of Medical Physics, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.

Department of Radiology Technology, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.

出版信息

Radiat Prot Dosimetry. 2020 Jul 24;189(4):527-533. doi: 10.1093/rpd/ncaa073.

DOI:10.1093/rpd/ncaa073

PMID:32472135

Abstract

This study was designed to evaluate the effect of the radiological technologists' training on optimising the eye lens dose in brain computed tomography (CT) examinations. The lens dose of 50 adult patients was measured using thermoluminescent dosimeters before and after technologists' training. Dose values of lenses, dose length product (DLP), volumetric CT dose index (CTDIvol) as well as image quality in terms of quantitative (contrast to noise ratio and signal to noise ratio) and subjective (artefact) parameters were compared before and after training. Lens dose values were 31.57 ± 9.84 mGy and 5.36 ± 1.53 mGy before and after training, respectively, which was reduced by ~83% (p < 0.05). The values of DLP, CTDIvol and image quality parameters were not significantly different (p > 0.05) and all images were diagnostically acceptable. Excluding the orbits from the scanning range is an efficient approach to optimize the lens dose; the training of the technologists has also a pivotal role in dose reducing.

摘要

本研究旨在评估放射技师培训对优化脑计算机断层扫描（CT）检查中晶状体剂量的影响。在培训前后，使用热释光剂量计测量了 50 名成年患者的晶状体剂量。比较了培训前后晶状体剂量值、剂量长度乘积（DLP）、容积 CT 剂量指数（CTDIvol）以及定量（对比噪声比和信噪比）和主观（伪影）参数的图像质量。晶状体剂量值分别为培训前后的 31.57±9.84mGy 和 5.36±1.53mGy，降低了约 83%（p<0.05）。DLP、CTDIvol 和图像质量参数的值没有显著差异（p>0.05），所有图像均具有诊断可接受性。将眼眶从扫描范围中排除是优化晶状体剂量的有效方法；技师的培训在降低剂量方面也起着关键作用。