Implementation of a parallel-beam optical-CT apparatus for three-dimensional radiation dosimetry using a high-resolution CCD camera

Huang, Wen‐Tzeng; Chen, Chin-Hsing; Hung, Chao-Nan; Tuan, Chiu-Ching; Chang, You-Soon

doi:10.1016/j.nima.2015.01.050

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…Three-dimensional (3D) gel dosimetry was used to validate the dose distribution agreement of VMAT, and the results showed good performance [12]. The passing rate can be remarkably high at approximately 95% agreement compared with that of TPS, with 3%/3 mm criterion [13,14]. The dose verification of single square-field and multifield irradiation of IMRT was also performed by the 3D gel dosimeters [15].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional dose comparison of flattening filter (FF) and flattening filter-free (FFF) radiation therapy by using NIPAM gel dosimetry

et al. 2019

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Intensity-modulated radiotherapy and volumetric modulated arc therapy are modern radiation therapy technologies that can create the desired dose distribution by multileaf collimator movement and dose-rate control. However, the homogeneous dose delivery of small-field irradiation techniques shows disagreement with that of treatment planning system. The removal of the flattening filter by flattening filter free (FFF) beam irradiation increases dose conformity and further reduces treatment delivery time in radiosurgery. This study aims to investigate the dose distribution of FFF and flattened beams for small-field irradiation by using the 3D gel dosimeter. The N -isopropylacrylamide (NIPAM) polymer gel dosimeter was employed to record the 3D dose distribution. In addition, flattened and FFF beams were compared using the gamma evaluation technique. The use of an FFF accelerator resulted in excellent radiation treatments with short delivery times and low doses to normal tissues and organs. Results also showed that the passing rate increased with the decrease of field size (30 × 30, 20 × 20, and 10 × 10 mm 2 ) at post-irradiation times of 24, 48, 72, and 96 h. The passing rates for each field size were retained at the same level when gamma criteria, namely, distance-to-agreement (DTA) = 3 mm/dose difference (DD) = 3%, were used. Nevertheless, the passing rates for each field size decreased slowly after 48 h when DTA = 2 mm/DD = 2%. The Wilcoxon signed-rank test was used to determine statistical difference with a significant level of p < 0.05. The passing rates of flattened and FFF beams showed no significant difference. The edge enhancement effect in the flattened beam was more evident than in the FFF beam. The 3D NIPAM gel dosimeter can be used for dose verification of small field for radiation therapy with high dose rate.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional dose comparison of flattening filter (FF) and flattening filter-free (FFF) radiation therapy by using NIPAM gel dosimetry

et al. 2019

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Dose verification of volumetric modulation arc therapy by using a NIPAM gel dosimeter combined with a parallel-beam optical computed tomography scanner

Yao

Chang

Tsai

et al. 2017

J Radioanal Nucl Chem

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Three-Dimensional Dose Verification of High-Dose-Rate (HDR) Flattening Filter Free (FFF) Radiation Therapy by Using NIPAM Gel Dosimetry

Yao

Chang

Lin

et al. 2019

Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)

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Flattening filter free (FFF) beam exhibits higher dose rate, lower head scatter photons, and less treatment time for patient than that of a flattened beam. The profile shape of the FFF beam is considerably sharper than that of the flattened beam due to the lack of flattening filter. However, the dose accuracy irradiated by the FFF beam should be investigated. In this study, a square irradiation field with 30 × 30 mm 2 was used for the two beam modes, namely, FFF and flattened beams. A three-dimensional N-isopropylacrylamide gel dosimeter was adopted to measure the dose distribution. A gamma evaluation was performed to compare the measured dose with the treatment planning system calculated data with gamma evaluation criteria, i.e., 3% dose difference and 3 mm distance-to-agreement. In addition, the experiment was repeated three times to compare the passing rates of FFF and flattened beams.

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Implementation of a parallel-beam optical-CT apparatus for three-dimensional radiation dosimetry using a high-resolution CCD camera

Cited by 3 publications

References 34 publications

Three-dimensional dose comparison of flattening filter (FF) and flattening filter-free (FFF) radiation therapy by using NIPAM gel dosimetry

Three-dimensional dose comparison of flattening filter (FF) and flattening filter-free (FFF) radiation therapy by using NIPAM gel dosimetry

Dose verification of volumetric modulation arc therapy by using a NIPAM gel dosimeter combined with a parallel-beam optical computed tomography scanner

Three-Dimensional Dose Verification of High-Dose-Rate (HDR) Flattening Filter Free (FFF) Radiation Therapy by Using NIPAM Gel Dosimetry

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