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Feasibility on Statistical Process Control Analysis of Delivery Quality Assurance in Helical Tomotherapy

장경환
대한방사선과학회 (Korean Society of Radiological Science)|2022.12|Journal of Radiological Science and Technology|제45권 제6호|pp. 491-502

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참고문헌

키워드

Statistical Process ControlDelivery Quality AssuranceTomotherapyProcess AnalysisTreatment Planning Parameter
주제분류방사선과학

초록

The purpose of this study was to retrospectively investigate the upper and lower control limits of treatment planning parameters using EBT film based delivery quality assurance (DQA) results and to analyze the results of statistical process control (SPC) in helical tomotherapy (HT). A total of 152 patients who passed or failed DQA results were retrospectively included in this study. Prostate (n = 66), rectal (n = 51), and large-field cancer patients, including lymph nodes (n = 35), were randomly selected. The absolute point dose difference (DD) and global gamma passing rate (GPR) were analyzed for all patients. Control charts were used to evaluate the upper and lower control limits (UCL and LCL) for all the assessed treatment planning parameters. Treatment planning parameters such as gantry period, leaf open time (LOT), pitch, field width, actual and planning modulation factor, treatment time, couch speed, and couch travel were analyzed to provide the optimal range using the DQA results. The classification and regression tree (CART) was used to predict the relative importance of variables in the DQA results from various treatment planning parameters. We confirmed that the proportion of patients with an LOT below 100 ms in the failure group was relatively higher than that in the passing group. SPC can detect QA failure prior to over dosimetric QA tolerance levels. The acceptable tolerance range of each planning parameter may assist in the prediction of DQA failures using the SPC tool in the future.

Abstract

The purpose of this study was to retrospectively investigate the upper and lower control limits of treatment planning parameters using EBT film based delivery quality assurance (DQA) results and to analyze the results of statistical process control (SPC) in helical tomotherapy (HT). A total of 152 patients who passed or failed DQA results were retrospectively included in this study. Prostate (n = 66), rectal (n = 51), and large-field cancer patients, including lymph nodes (n = 35), were randomly selected. The absolute point dose difference (DD) and global gamma passing rate (GPR) were analyzed for all patients. Control charts were used to evaluate the upper and lower control limits (UCL and LCL) for all the assessed treatment planning parameters. Treatment planning parameters such as gantry period, leaf open time (LOT), pitch, field width, actual and planning modulation factor, treatment time, couch speed, and couch travel were analyzed to provide the optimal range using the DQA results. The classification and regression tree (CART) was used to predict the relative importance of variables in the DQA results from various treatment planning parameters. We confirmed that the proportion of patients with an LOT below 100 ms in the failure group was relatively higher than that in the passing group. SPC can detect QA failure prior to over dosimetric QA tolerance levels. The acceptable tolerance range of each planning parameter may assist in the prediction of DQA failures using the SPC tool in the future.

참고문헌 (24)

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토모테라피에서 통계적공정관리를 이용한 EBT 필름 기반의 선량품질보증의 치료계획 가이드라인장경환대한방사선과학회 · Journal of Radiological Science and Technology2022 · 제45권 제5호방사선치료 시 다양한 기계학습을 이용한 선량품질관리 결과의 예측장경환대한방사선과학회 · Journal of Radiological Science and Technology2024 · 제47권 제4호Correlation between Treatment Planning Parameters and PSQA Results for Two Quality Assurance Devices장경환대한방사선과학회 · Journal of Radiological Science and Technology2025 · 제48권 제5호Evaluation of DQA for Tomotherapy using 3D Volumetric Phantom김정구, 이상욱대한방사선과학회 · Journal of Radiological Science and Technology2016 · 제39권 제4호A Comparison of Patient-specific Delivery Quality Assurance (DQA) Devices in Radiation Therapy장경환대한방사선과학회 · Journal of Radiological Science and Technology2023 · 제46권 제3호소프트웨어 기반 정도관리 시스템을 이용한 부피세기조절회전치료 환자 별 정도관리의 유용성 평가강동진, 권경태, 김연래, 민정환, 신영주, 정재용대한방사선과학회 · Journal of Radiological Science and Technology2018 · 제41권 제1호

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