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:: Volume 8, Issue 2 (9-2010) ::
Int J Radiat Res 2010, 8(2): 61-74 Back to browse issues page
Dosimetry limitations and pre-treatment dose profile correction for sliding window IMRT
G. Grigorov, J.C.L. Chow, N. Yazdani
, grigor.grigorov@grhosp.on.ca
Abstract:   (12189 Views)
Background: This work investigated the dosimetry limitations of the random and systematic uncertainties of sliding window (SW) intensity modulated radiation therapy (IMRT). Materials and Methods: A Varian 21EX linear accelerator, Pinnacle3 treatment planning system and radiographic film dosimetry was used. The limitations of the SW were studied using beam modulation ranging from 2 to 100 MU/beam, DR from 100 to 600 MU min-1, LV from 1 to 5 cm s-1 and field size up to 12 × 12 cm2. The random and systematic errors were investigated using clinical and flat beams, as well as beams of high profile modulation including linear, exponential, and sinusoidal profiles. Results: The leading edge and plateau of the SW profiles have a significant deformation for higher DR and for beams of < 10 MUs/beam. It was found that the error is directly proportional to the DR and LV, and inversely proportional to the number of MU/beam. Conclusion: The high DR and LV are limiting factors, producing random profile deformation when SW beams of small number of MU/beam are delivered. A very good agreement was found between the planned and delivered geometrical and clinical dose profiles when beams > 10 MUs irradiated by a DR from 100 to 600 MU min-1 and LV from 1 to 5 cm s-1. After the proposed correction, an average difference < 0.5% for clinical profiles was measured for beams irradiated with DR = 600 MU min-1 and LV= 5 cm s-1. It was concluded that this correction methodology may serve as a pre-treatment Quality Assurance tool for SW IMRT beams. Iran. J. Radiat. Res., 2010 8 (2): 61-74
Keywords: IMRT, sliding window, pre-treatment QA and pre-treatment dose correction.
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Type of Study: Original Research | Subject: Radiation Biology
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Grigorov G, Chow J, Yazdani N. Dosimetry limitations and pre-treatment dose profile correction for sliding window IMRT. Int J Radiat Res 2010; 8 (2) :61-74
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Volume 8, Issue 2 (9-2010) Back to browse issues page
International Journal of Radiation Research
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