EVALUATING THE TIME SAVINGS OF TARGET VOLUME AUTO-CONTOURING ASSISTANCE IN CERVICAL CANCER HDR BRACHYTHERAPY

IF 5.3 1区 医学 Q1 ONCOLOGY
Fletcher Barrett , Philip McGeachy , Tyler Meyer , Ruth Fullerton , Corrine Doll , Nina Samson , Tien Phan
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引用次数: 0

Abstract

Purpose:

To assess the impact on contouring efficiency when an in-house machine learning (ML) model provides a starting point for the high-risk clinical target volume (HR-CTV) definition in high-dose-rate (HDR) cervical brachytherapy.

Materials and Methods:

T2-weighted MRIs with HR-CTV contours from patients receiving HDR cervical brachytherapy between 2016 and 2024 were used to develop and test an ML model. The model was built using PyTorch and architectures from the Medical Open Network for AI (MONAI). The final model was used to generate an HR-CTV contour on previously unseen MRIs, serving as a starting point for the radiation oncologist to edit until a clinically acceptable contour was achieved. Efficiency was assessed by having four radiation oncologists individually contour the HR-CTV offline, with and without model support, two months apart. Contouring time for both scenarios was compared to quantify the model’s impact on efficiency. The quality of the contour made with model support was assessed using the Sorensen-Dice similarity coefficient (DSC) against the same radiation oncologist’s contour without model support.

Results:

The retrospective dataset for model development included 103 patients (151 MRIs) and the testing dataset consisted of 5 patients (11 MRIs). During development and testing, the model achieved an average DSC of 0.75 and 0.70, respectively, when compared to the clinical contours used for brachytherapy. Contouring time with and without model support in the testing set was 5.1±2.7 and 8.7±4.5 minutes, respectively (p<0.01), corresponding to a 3.6-minute absolute reduction, or a 38% decrease in contouring time with model support. The average DSC between the final contours made with and without support was 0.77±0.07.

Conclusions:

Target volume auto-contouring assistance with an ML model reduced the average time spent contouring the HR-CTV by 38% while maintaining contour quality. Future work will include a prospective study to validate the efficiency of this ML model in a real-time clinical setting.
评估靶体积自动轮廓辅助宫颈癌HDR近距离治疗节省的时间
目的:评估当内部机器学习(ML)模型为高剂量率(HDR)宫颈近距离放疗的高风险临床靶体积(HR-CTV)定义提供起点时,对轮廓效率的影响。材料和方法:使用2016年至2024年间接受HDR颈椎近距离治疗的患者的t2加权mri和HR-CTV轮廓来开发和测试ML模型。该模型是使用PyTorch和医学开放网络AI (MONAI)的架构构建的。最后的模型用于在以前未见过的mri上生成HR-CTV轮廓,作为放射肿瘤学家编辑的起点,直到获得临床可接受的轮廓。通过四名放射肿瘤学家分别在有和没有模型支持的情况下,间隔两个月进行HR-CTV离线轮廓,评估效率。比较了两种情况下的轮廓时间,以量化模型对效率的影响。使用Sorensen-Dice相似系数(DSC)对没有模型支持的同一放射肿瘤学家的轮廓进行评估。结果:模型开发的回顾性数据集包括103例患者(151例核磁共振成像),测试数据集包括5例患者(11例核磁共振成像)。在开发和测试期间,与用于近距离治疗的临床轮廓相比,该模型的平均DSC分别为0.75和0.70。在测试集中,有模型支持和没有模型支持的轮廓时间分别为5.1±2.7和8.7±4.5分钟(p<0.01),对应于有模型支持的轮廓时间绝对减少3.6分钟,或减少38%。在有支撑和没有支撑的情况下,最终轮廓的平均DSC为0.77±0.07。结论:目标体积自动轮廓辅助ML模型在保持轮廓质量的同时减少了HR-CTV轮廓化的平均时间38%。未来的工作将包括一项前瞻性研究,以验证该ML模型在实时临床环境中的效率。
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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来源期刊
Radiotherapy and Oncology
Radiotherapy and Oncology 医学-核医学
CiteScore
10.30
自引率
10.50%
发文量
2445
审稿时长
45 days
期刊介绍: Radiotherapy and Oncology publishes papers describing original research as well as review articles. It covers areas of interest relating to radiation oncology. This includes: clinical radiotherapy, combined modality treatment, translational studies, epidemiological outcomes, imaging, dosimetry, and radiation therapy planning, experimental work in radiobiology, chemobiology, hyperthermia and tumour biology, as well as data science in radiation oncology and physics aspects relevant to oncology.Papers on more general aspects of interest to the radiation oncologist including chemotherapy, surgery and immunology are also published.
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