Is the dose distribution distorted in IMRT and RapidArc treatment when patient plans are swapped across beam-matched machines?
| Autor: | Vendhan Subramani, Chockkalingam Krishnappan, Chandrasekaran Anu Radha, Madhan Kumar Gunasekaran |
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| Rok vydání: | 2016 |
| Předmět: |
Male
beam‐matched linacs Dose distribution Two stages Pelvis 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Humans Radiation Oncology Physics Medicine Radiology Nuclear Medicine and imaging Radiometry Head and neck Instrumentation Radiation business.industry Radiotherapy Planning Computer-Assisted Prostatic Neoplasms Radiotherapy Dosage Dose prescription beam‐matching criteria TPS commissioning Head and Neck Neoplasms 030220 oncology & carcinogenesis dosimetric evaluation Maximum dose Radiotherapy Intensity-Modulated business Nuclear medicine |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| DOI: | 10.1120/jacmp.v17i5.6104 |
| Popis: | The purpose of this study is to evaluate the degree of dose distribution distortion in advanced treatments like IMRT and RapidArc when patient plans are swapped across dosimetrically equivalent so‐called “beam‐matched” machines. For this purpose the entire work is divided into two stages. At forefront stage all basic beam properties of 6 MV X‐rays like PDD, profiles, output factors, TPR20/10 and MLC transmission of two beam‐matched machines — Varian Clinac iX and Varian 600 C/D Unique — are compared and evaluated for differences. At second stage 40 IMRT and RapidArc patient plans from the pool of head and neck (H&N) and pelvis sites are selected for the study. The plans are swapped across the machines for dose recalculation and the DVHs of target and critical organs are evaluated for dose differences. Following this, the accuracy of the beam‐matching at the TPS level for treatments like IMRT and RapidArc are compared. On PDD, profile (central 80%) and output factor comparison between the two machines, a maximum percentage disagreement value of −2.39%,−2.0% and −2.78%, respectively, has been observed. The maximum dose difference observed at volumes in IMRT and RapidArc treatments for H&N dose prescription of 69.3 Gy/33 fractions is 0.88 Gy and 0.82 Gy, respectively. Similarly, for pelvis, with a dose prescription of 50 Gy/25 fractions, a maximum dose difference of 0.55 Gy and 0.53 Gy is observed at volumes in IMRT and RapidArc treatments, respectively. Overall results of the swapped plans between two machines' 6 MV X‐rays are well within the limits of accepted clinical tolerance. PACS number(s): 87.56.bd |
| Databáze: | OpenAIRE |
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