Design and implementation of a 'cheese' phantom-based Tomotherapy TLD dose intercomparison
| Autor: | Simon Heinze, Guido Henke, H. Schiefer, Konrad Buchauer, Ludwig Plasswilm |
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| Rok vydání: | 2015 |
| Předmět: |
medicine.medical_specialty
Radiobiology Phantoms Imaging business.industry medicine.medical_treatment Reproducibility of Results Radiotherapy Dosage Equipment Design Sensitivity and Specificity Tomotherapy Imaging phantom Equipment Failure Analysis Radiation therapy Oncology Biomimetics medicine Dosimetry Thermoluminescent Dosimetry Radiology Nuclear Medicine and imaging Medical physics Radiotherapy Intensity-Modulated Thermoluminescent dosimeter Nuclear medicine business Quality assurance |
| Zdroj: | Strahlentherapie und Onkologie. 191:855-861 |
| ISSN: | 1439-099X 0179-7158 |
| DOI: | 10.1007/s00066-015-0850-2 |
| Popis: | The unique beam-delivery technique of Tomotherapy machines (Accuray Inc., Sunnyvale, Calif.) necessitates tailored quality assurance. This requirement also applies to external dose intercomparisons. Therefore, the aim of the 2014 SSRMP (Swiss Society of Radiobiology and Medical Physics) dosimetry intercomparison was to compare two set-ups with different phantoms.A small cylindrical Perspex phantom, which is similar to the IROC phantom (Imaging and Radiation Oncology Core, Houston, Tex.), and the "cheese" phantom, which is provided by the Tomotherapy manufacturer to all institutions, were used. The standard calibration plans for the TomoHelical and TomoDirect irradiation techniques were applied. These plans are routinely used for dose output calibration in Tomotherapy institutions. We tested 20 Tomotherapy machines in Germany and Switzerland. The ratio of the measured (Dm) to the calculated (Dc) dose was assessed for both phantoms and irradiation techniques. The Dm/Dc distributions were determined to compare the suitability of the measurement set-ups investigated.The standard deviations of the TLD-measured (thermoluminescent dosimetry) Dm/Dc ratios for the "cheese" phantom were 1.9 % for the TomoHelical (19 measurements) and 1.2 % (11 measurements) for the TomoDirect irradiation techniques. The corresponding ratios for the Perspex phantom were 2.8 % (18 measurements) and 1.8 % (11 measurements).Compared with the Perspex phantom-based set-up, the "cheese" phantom-based set-up without individual planning was demonstrated to be more suitable for Tomotherapy dose checks. Future SSRMP dosimetry intercomparisons for Tomotherapy machines will therefore be based on the "cheese" phantom set-up. |
| Databáze: | OpenAIRE |
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