Statistical process control analysis for patient quality assurance of intensity modulated radiation therapy

• Published in: Journal of the Korean Physical Society Vol. 71; no. 10; pp. 717 - 721
• Main Authors: Lee, Rena, Kim, Kyubo, Cho, Samju, Lim, Sangwook, Lee, Suk, Shim, Jang Bo, Huh, Hyun Do, Lee, Sang Hoon, Ahn, Sohyun
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.11.2017; Springer Nature B.V; 한국물리학회
• Subjects: Breast; Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Process controls; Prostate; Quality assurance; Radiation therapy; Statistical process control; Theoretical; 물리학; Process capability index; Statistical process control; Gamma pass rate; IMRT/VMAT QA; Gamma index
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.71.717

This study applied statistical process control to set and verify the quality assurances (QA) tolerance standard for our hospital’s characteristics with the criteria standards that are applied to all the treatment sites with this analysis. Gamma test factor of delivery quality assurances (DQA) was based on 3%/3 mm. Head and neck, breast, prostate cases of intensity modulated radiation therapy (IMRT) or volumetric arc radiation therapy (VMAT) were selected for the analysis of the QA treatment sites. The numbers of data used in the analysis were 73 and 68 for head and neck patients. Prostate and breast were 49 and 152 by MapCHECK and ArcCHECK respectively. C p value of head and neck and prostate QA were above 1.0, C pml is 1.53 and 1.71 respectively, which is close to the target value of 100%. C pml value of breast (IMRT) was 1.67, data values are close to the target value of 95%. But value of was 0.90, which means that the data values are widely distributed. C p and C pml of breast VMAT QA were respectively 1.07 and 2.10. This suggests that the VMAT QA has better process capability than the IMRT QA. Consequently, we should pay more attention to planning and QA before treatment for breast Radiotherapy.