Impact of a deep-learning image reconstruction algorithm on image quality and detection of solid lung lesions

Joël Greffier , Maxime Pastor , Quentin Durand , Renaud Sales , Chris Serrand , Jean-Paul Beregi , Djamel Dabli , Julien Frandon
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Abstract

Purpose

To compare the impact of a deep-learning image reconstruction algorithm (Precise Image) with an iterative reconstruction algorithm on image quality and detection of solid lung lesions in chest CT images.

Methods

All consecutive patients with at least one solid lung lesion diagnosed between December 2021 and February 2022 were retrospectively included. Images were reconstructed using Level 4 of the iterative reconstruction algorithm (i4) and the Standard/Smooth/Smoother levels of the deep-learning image reconstruction algorithm. Mean attenuation and standard deviation were measured by placing regions of interest in fat, muscle, trachea and solid lung lesions. The contrast-to-noise ratio between the lesion and the trachea was computed. Two radiologists assessed image noise and image smoothness, overall image quality and confidence diagnostic level using Likert scales. One radiologist also measured the large axis of the largest lesion. Statistical analyses was performed to compare outcomes obtained with the different algorithms.

Results

Thirty patients with a mean age of 70.0 ± 9.0 years (17 men) were included. The mean CTDIvol was 6.3 ± 2.1 mGy. For all tissues, the contrast-to-noise ratio was similar for i4 and Standard level (p > 0.05) but increased significantly with other deep-learning image reconstruction levels compared to i4 (p < 0.05) and increased significantly from Standard to Smoother. Radiologists rated the image noise with a similar score between i4 and Standard level but decreased significantly between i4 and other deep-learning image reconstruction levels (p < 0.05) and from Standard to Smoother levels (p < 0.01). Overall image quality score were highest for the Smooth and Smoother levels.

Conclusion

Smooth and Smoother levels may now be used in clinical practice for chest CT acquisitions in solid lung lesion follow-up.
一种深度学习图像重建算法对图像质量和肺实体病变检测的影响
目的比较深度学习图像重建算法(Precise image)与迭代重建算法对胸部CT图像质量和肺实性病变检测的影响。方法回顾性分析所有在2021年12月至2022年2月期间诊断为至少一种实性肺病变的连续患者。使用迭代重建算法的Level 4 (i4)和深度学习图像重建算法的Standard/Smooth/Smooth级别重建图像。通过在脂肪、肌肉、气管和实体肺病变中放置感兴趣的区域来测量平均衰减和标准偏差。计算病变与气管的噪比。两名放射科医生使用李克特量表评估图像噪声和图像平滑度,整体图像质量和置信度诊断水平。一位放射科医生还测量了最大病变的大轴。统计分析比较不同算法得到的结果。结果入选患者30例,平均年龄70.0±9.0岁,男性17例。平均CTDIvol为6.3±2.1 mGy。对于所有组织,i4和标准水平的对比噪声比相似(p >;0.05),但与其他深度学习图像重建水平相比显著增加(p <;0.05),从标准到平滑显著增加。放射科医生对图像噪声的评分在i4和标准水平之间相似,但在i4和其他深度学习图像重建水平之间显著下降(p <;0.05),从标准水平到平滑水平(p <;0.01)。整体图像质量得分最高的是平滑和平滑水平。结论在实性肺病变随访中,平滑水平可用于胸部CT扫描。
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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