Independent assessment of source transit time for the BEBIG SagiNova® cobalt-60 high dose rate brachytherapy afterloader

Kanani, Abolfazl; Karbasi, Sareh; Mosleh-Shirazi, Mohammad Amin

doi:10.1007/s13246-019-00788-9

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Another important quality control (QC) test is verification of delivered dose by HDR equipment prior to the first treatment. This dosimetric QC item is required for commissioning/QA a new treatment planning system (TPS) or new HDR-BT equipment as well as for audit purposes [4,[14][15][16][17][18].…”

Section: Purposementioning

confidence: 99%

Development of a multi-purpose quality control phantom for MRI-based treatment planning in high-dose-rate brachytherapy of cervical cancer

Kanani¹,

Owrangi²,

Yazdi³

et al. 2023

jcb

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Purpose: Suitable commissioning and quality control (QC) tests for high-dose-rate brachytherapy (HDR-BT) is necessary to ensure dosimetric and geometric accuracy of the treatment. This study aimed to present the methodology of developing a novel multi-purpose QC phantom (AQuA-BT) and examples of its' application in 3D image-based (particularly magnetic resonance imaging [MRI]-based) planning for cervix BT.Material and methods: Design criteria led to a phantom with sufficient size waterproof box for dosimetry and capability for inserting other components inside the phantom for: (A) Validating dose calculation algorithms in treatment planning systems (TPSs) using a small-volume ionization chamber; (B) Testing volume calculation accuracy in TPSs for bladder, rectum, and sigmoid organs at risk (OARs) constructed by 3D printing; (C) Quantification of MRI distortions using 17 semi-elliptical plates with 4,317 control points to mimic a realistic female's pelvis size; and (D) Quantification of image distortions and artifacts induced by MRI-compatible applicators using a specific radial fiducial marker. The utility of the phantom was tested in various QC procedures.Results: The phantom was successfully implemented for examples of intended QC procedures. The maximum deviation between the absorbed doses to water assessed with our phantom and those calculated by SagiPlan TPS was 1.7%. The mean discrepancy in volumes of TPS-calculated OARs was 1.1%. The differences between known distances within the phantom on MR imaging were within 0.7 mm compared with computed tomography.Conclusions: This phantom is a promising useful tool for dosimetric and geometric quality assurance (QA) in MRIbased cervix BT.

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Section: Purposementioning

confidence: 99%

Development of a multi-purpose quality control phantom for MRI-based treatment planning in high-dose-rate brachytherapy of cervical cancer

Kanani¹,

Owrangi²,

Yazdi³

et al. 2023

jcb

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“…Several techniques have been proposed to evaluate the transit dose component, but most are based on ionization chambers and electronic portal imaging devices (EPID), unsuitable for radiation processing dosimetry [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Transit dose measurements using alanine and diode-based dosimeters

Gonçalves

Somessari

et al. 2022

Braz. J. Rad. Sci.

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The growing interest in low-dose (< 100 Gy) radiation processing applications has raised concerns about accurately measuring the absorbed dose in irradiated materials. Depending on the irradiator design, the transit time due to the radioactive source movement (or the product itself) until the stable irradiation position might affect the predicted absorbed dose. This work aims to evaluate the transit dose in a 60Co Gammacell 220-Nordion irradiator, which has radioactive sources settled at the bottom of a lead shielding. When the facility is on, the product and the dosimeter are mechanically guided down to the irradiation position, and hereafter the selected exposure time starts to be counted. At the end of irradiation, both product and dosimeter rise to the initial position enabling them to be gathered by the operator. The product is continuously irradiated at different dose rates during its fall and rise movement, preventing the transit dose from being obtained straightforward. The experimental approach adopted is to assess the transit time, and thus the transit dose, using an online diode-based dosimetry system previously calibrated against reference standard alanine dosimeters. The agreement between the transit doses attained with the diode (0.41 ± 0.02) Gy and alanine ((0.38 ± 0.01) Gy validates the method herein proposed.

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Independent assessment of source transit time for the BEBIG SagiNova® cobalt-60 high dose rate brachytherapy afterloader

Cited by 2 publications

References 18 publications

Development of a multi-purpose quality control phantom for MRI-based treatment planning in high-dose-rate brachytherapy of cervical cancer

Development of a multi-purpose quality control phantom for MRI-based treatment planning in high-dose-rate brachytherapy of cervical cancer

Transit dose measurements using alanine and diode-based dosimeters

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