A multileaf collimator phantom for the quality assurance of radiation therapy planning systems and CT simulators

McNiven, Andrea; Kron, Tomas; Dyk, Jake Van

doi:10.1016/j.ijrobp.2004.06.013

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…Simultaneously, the radiation dose to the surrounding normal tissues is limited to minimize the risk of acute side effects and chronic complications. For this purpose, it is vital to establish a treatment plan with accurate and precise dose measurements and to reduce inconsistencies in treatments [1,2].…”

Section: Introductionmentioning

confidence: 99%

Radiation detection materials for quality assurance and dose distribution assessment of small fields of high-energy X-rays

Noh¹,

Kim²,

Kim³

et al. 2020

J. Inst.

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A: This paper present a system for an integrated radiotherapy quality assurance (QA) protocol that maintains dose measurement accuracy through a dosimeter capable of accurate smallfield dosimetry. The beam pulse data of a linear accelerator (LINAC) was obtained, and its conformity with the photoconductor material detection signal was evaluated. To determine the radiation detection material for dose measurement, unit-cell-type specimens were fabricated through sedimentation from four candidate materials (lead II iodide, PbI 2 ; lead II oxide, PbO; mercury II iodide, HgI 2 ; and a mixture of HgI 2 and titanium dioxide, TiO 2 ). Based on evaluations of dark current, output current, rising time (10%-90%), falling time, and response delay, the mixed TiO 2 and HgI 2 material exhibited the best characteristics. Accordingly, we fabricated 3 × 3 and 6 × 6 multipixel arrays capable of small-field dosimetry. The 3 × 3 multi-pixel array had a pixel size of 3 cm × 3 cm; the thickness of the detection material was approximately 400 µm. LabVIEW was used to design the arrays. Analog signals generated in each pixel were converted to digital signals through an analog-to-digital converter, displayed in a waveform, and stored. The 6 × 6 multipixel array had pixels of diameter of 1 mm and pixel pitch of 1 mm; thickness of the detection material was approximately 485 µm. A LINAC was used to evaluate the arrays according to the detection characteristics and dose changes at acceleration voltages of 4, 6, 10, and 15 MV. Excellent reproducibility, linearity, and accuracy were confirmed by comparing the dose detector and response characteristics to actual cases. This study verifies the applicability of photoconductor-based solidstate detectors, which can replace existing dosimeters for small-field QA, and proposes a new protocol to simplify complex and difficult radiotherapy QA procedures, thereby increasing user convenience.

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Section: Introductionmentioning

confidence: 99%

Radiation detection materials for quality assurance and dose distribution assessment of small fields of high-energy X-rays

Noh¹,

Kim²,

Kim³

et al. 2020

J. Inst.

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show abstract

“…The IMRT dose quality assurance measurements need to explicit and include a quantitative registration process for independently validating the spatial location of the dose gradients (McNiven et al, 2004). The spatial location of measurement points must be known to high accuracy to enable quantitative evaluation of the calculated doses at those points.…”

Section: Introductionmentioning

confidence: 99%

TL and OSL dose response of LiF:Mg,Ti and Al2O3:C dosimeters using a PMMA phantom for IMRT technique quality assurance

Matsushima

Veneziani

Sakuraba

et al. 2015

Applied Radiation and Isotopes

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“…To achieve an accurate dose delivery, complete and comprehensive quality assurance (QA) measurements for the MLC are necessary. Previous works on the QA measurements for the MLC such as transmission/leakage, position, interlock and overshoot effect (Klein et al 1995, Ezzell and Chungbin 2001, Yang and Xing 2004, McNiven et al 2004, Chang et al 2004 focused less on the travel velocities of the MLC leaves. For a linear accelerator (linac) such as the Varian 21 EX with a single-focused MLC of 120 leaves used in our centre, 120 motors, controlled by an MLC controller board linked to the console computer, control the 120 leaves individually.…”

Section: Introductionmentioning

confidence: 99%

Measurement for the MLC leaf velocity profile by considering the leaf leakage using a radiographic film

Chow

Григоров

2006

Phys. Med. Biol.

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A method to measure the velocity profile of a multi-leaf collimator (MLC) leaf along its travel range using a radiographic film is reported by considering the intra-leaf leakage. A specific dynamic MLC field with leaves travelling from the field edge to the isocentre line was designed. The field was used to expose a radiographic film, which was then scanned, and the dose profile along the horizontal leaf axis was measured. The velocity at a sampling point on the film can be calculated by considering the horizontal distance between the sampling point and the isocentre line, dose at the sampling point, dose rate of the linear accelerator, the total leaf travel time from the field edge to isocentre line and the pre-measured dose rate of leaf leakage. With the leaf velocities and velocity profiles for all MLC leaves measured routinely, a comprehensive and simple QA for the MLC can be set up to test the consistency of the leaf velocity performance which is essential to the IMRT delivery using a sliding window technique.

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A multileaf collimator phantom for the quality assurance of radiation therapy planning systems and CT simulators

Cited by 7 publications

References 7 publications

Radiation detection materials for quality assurance and dose distribution assessment of small fields of high-energy X-rays

Radiation detection materials for quality assurance and dose distribution assessment of small fields of high-energy X-rays

TL and OSL dose response of LiF:Mg,Ti and Al2O3:C dosimeters using a PMMA phantom for IMRT technique quality assurance

Measurement for the MLC leaf velocity profile by considering the leaf leakage using a radiographic film

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