Study on the established customized limits for the daily quality assurance procedure
| Autor: | Jian-Bo Song, Xiao-Li Jin, Jin-Xin Peng, Xiao-Peng Pan, Rui Guo, Xiao-Fen Xing |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Quality Control
daily QA3 Quality Assurance Health Care Computer science Health Toxicology and Mutagenesis Process capability Oncology/Medicine Range (statistics) Proton Therapy Process control Humans Radiology Nuclear Medicine and imaging Control chart Limit (mathematics) Radiation business.industry Radiotherapy Planning Computer-Assisted daily QA procedure Statistical process control statistical process control (SPC) Reliability engineering Data point AcademicSubjects/SCI00960 Radiotherapy Intensity-Modulated AcademicSubjects/MED00870 business Quality assurance |
| Zdroj: | Journal of Radiation Research |
| ISSN: | 1349-9157 |
| Popis: | Since there are no corresponding specification limits for some new daily quality assurance (QA) items in the TG-142, it is a compromise that the specification limits used in the monthly or annual QA procedures are used for the daily QA procedure in work. But there is no basis for whether this is feasible. The purpose of this article is to analyze QA results using SPC to determine the tolerance limits at our institution, and to present the usefulness of the analysis method using SPC. The data of three groups daily QA processes performed with Daily QA3 in three years were analyzed using statistical process control (SPC). For calculating capability indices (Cp, Cpk, Cpm and Cpmk) of processes, the appropriate number of calculation points was analyzed firstly. Then, in calculating the capability indices for output, limits ±3% of the daily QA in the TG-142 were used as the specification limit, while for flatness and symmetry, an annual QA limits of ±1% was used. For putting forward measures to solve the problem, customized tolerance and action limits were established for each process. And the process control charts calculated using data measured by the five therapists and a medical physicist were compared. At least six to eight weeks of control daily check data points (i.e. 30–40 points) should be used for calculating the individuals and moving range (I-MR) control chart to ensure the stability of control lines. Process capability indices of output were all ≥1, some were up to 3–4. While for symmetry, some processes failed to meet the requirements that capability indices were |
| Databáze: | OpenAIRE |
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