Reduction of Ovarian Radiation Dose and Image Quality Disruptive Effects: New Constructed Shields for CT Scanning of Abdomen and Pelvis

Mehran Bagheri, Mohammad Reza Azimi Aval
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Abstract

Background: Cumulative dose of ovary as a radiosensitive organ during abdominal and pelvic CT scan imaging is still a controversial challenge that requires practical dose reduction strategies. Although bismuth shields can reduce the dose in the right proportions, their use is controversial due to the reduced image quality. Objectives: The aim of this study was to investigate the performance of a new combination of X-ray absorber structures that have less effect on image quality parameters. Methods: First, various shields with different weight percentages of Cu and Bi were made, then the percentage of dose reduction and image quality were evaluated via phantoms. Finally, Shield with the least effect on image quality was evaluated for clinical evaluation on 20 patients. Results: Shielding with thicknesses of 1T and 3T reduced the Entrance skin dose of ovarian by about 52% and 73%, respectively. Shields with 90% cu-10% Bi and 100% Bi structures had the least and most destructive effects on image quality, respectively, and also have the same image quality. The 10% Bi-90% Cu shield provided a 21% greater dose reduction than the bismuth shield. Also, this 1T thick shield did not create an artifact in the reconstructed images. Conclusions: Shields are flexible, inexpensive, and user-friendly for ovarian shielding in abdominal and pelvic CT scans. Unlike bismuth shields, shields do not have the detrimental effects of image quality degradation.
降低卵巢辐射剂量和图像质量破坏效应:腹部和骨盆CT扫描的新型屏障
背景:卵巢作为一个放射敏感器官在腹部和骨盆CT扫描成像中的累积剂量仍然是一个有争议的挑战,需要实用的剂量降低策略。虽然铋屏蔽可以以适当的比例减少剂量,但由于图像质量降低,它们的使用存在争议。目的:本研究的目的是研究一种对图像质量参数影响较小的新型x射线吸收结构组合的性能。方法:首先制作不同重量百分比的Cu和Bi的各种屏蔽,然后通过幻影评估剂量减少百分比和图像质量。最后选取对图像质量影响最小的Shield对20例患者进行临床评价。结果:厚度为1T和3T的遮挡可使卵巢入口皮肤剂量分别降低约52%和73%。90% cu-10% Bi结构和100% Bi结构的屏蔽层对图像质量的破坏性影响最小、最大,且具有相同的图像质量。10% Bi-90% Cu的屏蔽层比铋屏蔽层提供了21%的剂量减少。而且,这个1T厚的盾牌并没有在重建图像中产生人工制品。结论:在腹部和骨盆CT扫描中,卵巢屏蔽是一种灵活、廉价、用户友好的方法。与铋屏蔽不同,屏蔽不会造成图像质量下降的不利影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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