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首页> 美国卫生研究院文献>Diagnostics >Radiation Dose Reduction in CT Torsion Measurement of the Lower Limb: Introduction of a New Ultra-Low Dose Protocol
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Radiation Dose Reduction in CT Torsion Measurement of the Lower Limb: Introduction of a New Ultra-Low Dose Protocol

机译：辐射剂量降低了下肢CT扭转测量：引入新的超低剂量方案

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摘要

This study analyzed the radiation exposure of a new ultra-low dose (ULD) protocol compared to a high-quality (HQ) protocol for CT-torsion measurement of the lower limb. The analyzed patients (n = 60) were examined in the period March to October 2019. In total, 30 consecutive patients were examined with the HQ and 30 consecutive patients with the new ULD protocol comprising automatic tube voltage selection, automatic exposure control, and iterative image reconstruction algorithms. Radiation dose parameters as well as the contrast-to-noise ratio (CNR) and diagnostic confidence (DC; rated by two radiologists) were analyzed and potential predictor variables, such as body mass index and body volume, were assessed. The new ULD protocol resulted in significantly lower radiation dose parameters, with a reduction of the median total dose equivalent to 0.17 mSv in the ULD protocol compared to 4.37 mSv in the HQ protocol (p < 0.001). Both groups showed no significant differences in regard to other parameters (p = 0.344–0.923). CNR was 12.2% lower using the new ULD protocol (p = 0.033). DC was rated best by both readers in every HQ CT and in every ULD CT. The new ULD protocol for CT-torsion measurement of the lower limb resulted in a 96% decrease of radiation exposure down to the level of a single pelvic radiograph while maintaining good image quality.
机译：该研究分析了新的超低剂量（ULD）协议的辐射暴露与下肢的CT扭转测量的高质量（HQ）协议相比。分析的患者（N = 60）在2019年3月至10月期间进行了审查。总计，连续30名连续30名患者用全自动管电压选择，自动曝光控制和迭代的新ULD协议检查了30名连续患者。图像重建算法。分析了辐射剂量参数以及对比度 - 噪声比（CNR）和诊断置信度（DC;由两个放射科学家的额定）分析，并评估潜在的预测变量，例如体重指数和体积。新的ULD协议导致辐射剂量参数显着降低，在HQ协议中，在ULD协议中减少了与0.17msv相当于0.17msV的辐射剂量参数。（P <0.001）。两组在其他参数方面没有显着差异（P = 0.344-0.923）。使用新的ULD协议（P = 0.033），CNR为12.2％。每个总HQ CT和每个ULD CT中的两个读者都是最佳的。下肢CT扭转测量的新ULD协议导致辐射暴露的降低96％，降低到单个盆腔射线照片的水平，同时保持良好的图像质量。

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