In the Czech Republic, a more advanced version of postal audit in radiotherapy (RT) is available. It covers dose measurements with thermoluminescent dosemeters (TLD) in more complex conditions of irradiation, when dose distribution is affected by heterogeneities in the irradiated volume. Relative deviation between doses measured with TLDs and doses stated by RT centre should not exceed 3%. During 2015-2017, all Czech RT centres equipped with modern linear accelerators were subjected to this more advanced TLD audit. A total of 70% of participants complied with the limit of 3% in the first round of this audit.
- MeSH
- částice - urychlovače normy MeSH
- celková dávka radioterapie MeSH
- fotony MeSH
- lidé MeSH
- plánování radioterapie pomocí počítače metody normy MeSH
- řízení kvality MeSH
- termoluminiscenční dozimetrie normy MeSH
- zajištění kvality zdravotní péče normy MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
UNLABELLED: The International Atomic Energy Agency (IAEA) has a long tradition of supporting development of methodologies for national networks providing quality audits in radiotherapy. A series of co-ordinated research projects (CRPs) has been conducted by the IAEA since 1995 assisting national external audit groups developing national audit programs. The CRP 'Development of Quality Audits for Radiotherapy Dosimetry for Complex Treatment Techniques' was conducted in 2009-2012 as an extension of previously developed audit programs. MATERIAL AND METHODS: The CRP work described in this paper focused on developing and testing two steps of dosimetry audit: verification of heterogeneity corrections, and treatment planning system (TPS) modeling of small MLC fields, which are important for the initial stages of complex radiation treatments, such as IMRT. The project involved development of a new solid slab phantom with heterogeneities containing special measurement inserts for thermoluminescent dosimeters (TLD) and radiochromic films. The phantom and the audit methodology has been developed at the IAEA and tested in multi-center studies involving the CRP participants. RESULTS: The results of multi-center testing of methodology for two steps of dosimetry audit show that the design of audit procedures is adequate and the methodology is feasible for meeting the audit objectives. A total of 97% TLD results in heterogeneity situations obtained in the study were within 3% and all results within 5% agreement with the TPS predicted doses. In contrast, only 64% small beam profiles were within 3 mm agreement between the TPS calculated and film measured doses. Film dosimetry results have highlighted some limitations in TPS modeling of small beam profiles in the direction of MLC leave movements. DISCUSSION: Through multi-center testing, any challenges or difficulties in the proposed audit methodology were identified, and the methodology improved. Using the experience of these studies, the participants could incorporate the auditing procedures in their national programs.
- MeSH
- dozimetry MeSH
- fantomy radiodiagnostické MeSH
- lidé MeSH
- mezinárodní agentury MeSH
- plánování radioterapie pomocí počítače metody normy MeSH
- radiometrie přístrojové vybavení metody normy MeSH
- řízení kvality MeSH
- termoluminiscenční dozimetrie přístrojové vybavení metody normy MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
Since 2002, the postal audit in dental radiography has been supplementing standard quality control (QC) tools for dental intraoral X-ray machines. An aim of the audit is to check basic X-ray machine parameters (field size, exposure reproducibility), and a quality of the whole process of diagnostic imaging (entrance surface air-kerma measurement, a check of film processing and an image quality evaluation). The standard QC tests, performed by private companies, check mainly the X-ray unit. Conversely, the audit gives better information about the patient examination practices. During the period of January 2002 to May 2004 approximately 4000 audits were performed. The results confirmed that main problems in dental radiography are due to incorrect film processing, non-optimised setting of the exposure parameters and use of obsolete X-ray machines. Only approximately 30% of performed audits were satisfactory with respect to all checked parameters.
- MeSH
- dentální audit MeSH
- filmová dozimetrie normy statistika a číselné údaje MeSH
- lékařská praxe - způsoby provádění normy statistika a číselné údaje MeSH
- průzkumy a dotazníky MeSH
- rentgendiagnostika zubní normy statistika a číselné údaje MeSH
- směrnice pro lékařskou praxi jako téma MeSH
- termoluminiscenční dozimetrie normy statistika a číselné údaje MeSH
- zajištění kvality zdravotní péče MeSH
- Geografické názvy
- Česká republika MeSH
- MeSH
- fantomy radiodiagnostické MeSH
- finanční podpora výzkumu jako téma MeSH
- lidé MeSH
- nádory MeSH
- plánování radioterapie pomocí počítače normy MeSH
- revize kvality lékařské péče MeSH
- termoluminiscenční dozimetrie normy přístrojové vybavení MeSH
- zajištění kvality zdravotní péče MeSH
- Check Tag
- lidé MeSH
- Geografické názvy
- Česká republika MeSH
