To propose adding index of achievement (IOA) to IMRT QA process

Autor: So-Hyun Park, Yu-Yun Noh, Min-Seok Cho, Jin-Beom Chung, Kyeong-Hyeon Kim, Dong-Seok Shin, Dong-Su Kim, Tae Suk Suh, Siyong Kim, Seong-Hee Kang, T Kim
Rok vydání: 2018
Předmět:
lcsh:Medical physics. Medical radiology. Nuclear medicine
Male
medicine.medical_specialty
Index (economics)
Quality Assurance
Health Care
lcsh:R895-920
lcsh:RC254-282
Sensitivity and Specificity
030218 nuclear medicine & medical imaging
03 medical and health sciences
0302 clinical medicine
Acceptance testing
Dose painting
Humans
Medicine
Radiology
Nuclear Medicine and imaging
Medical physics
Sensitivity (control systems)
IMRT
Patient specific QA
Measure (data warehouse)
business.industry
Research
Radiotherapy Planning
Computer-Assisted
Process (computing)
Prostatic Neoplasms
IMRT QA
Radiotherapy Dosage
lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens
Volumetric modulated arc therapy
QA index
Oncology
Head and Neck Neoplasms
030220 oncology & carcinogenesis
Feasibility Studies
Radiotherapy
Intensity-Modulated
business
Quality assurance
Algorithms
Zdroj: Radiation Oncology (London, England)
Radiation Oncology, Vol 13, Iss 1, Pp 1-14 (2018)
ISSN: 1748-717X
DOI: 10.1186/s13014-018-1055-5
Popis: Background In intensity modulated radiation therapy (IMRT) quality assurance (QA), evaluation of QA result using a pass/non-pass strategy under an acceptance criterion often suffers from lack of information on how good the plan is in absolute manner. In this study, we suggested adding an index system, previously developed for dose painting technique, to current IMRT QA process for better understanding of QA result. Methods The index system consists of three indices, index of achievement (IOA), index of hotness (IOH) and index of coldness (IOC). As indicated by its name, IOA does measure the level of agreement. IOH and IOC, on the other hand, measure the magnitude of overdose and underdose, respectively. A systematic analysis was performed with three 1-dimensional hypothetical dose distributions to investigate the characteristics of the index system. The feasibility of the system was also assessed with clinical volumetric modulated arc therapy (VMAT) QA cases from 8 head & neck and 5 prostate patients. In both simulation studies, certain amount of errors was intentionally induced to each dose distribution. Furthermore, we applied the proposed system to compare calculated with actual measured data for a total of 60 patients (30 head & neck and 30 prostate cases). QA analysis was made using both the index system and gamma method, and results were compared. Results While the gamma evaluation showed limited sensitivity in evaluating QA result depending on the level of tolerance criteria used, the proposed indices tended to better distinguish plans in terms of the amount of errors. Hotness and coldness of prescribed dose in the plan could be evaluated quantitatively by the indices. Conclusions The proposed index system provides information with which IMRT QA result would be better evaluated, especially when gamma pass rates are identical or similar among multiple plans. In addition, the independency of the index system on acceptance criteria would help making clear communications among readers of published articles and researchers in multi-institutional studies.
Databáze: OpenAIRE
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