Volumetric-modulated arc therapy lung stereotactic body radiation therapy dosimetric quality assurance: A comparison between radiochromic film and chamber array

Colodro, J.F. Mata; Berná, A. Serna; Puchades, V.; Amores, D. Ramos; Baños, Miguel Alcaraz

doi:10.4103/jmp.jmp_130_16

Cited by 7 publications

(7 citation statements)

References 38 publications

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“…This presented a challenge, because historically the Gamma Knife has been considered capable of delivering dose distributions accurately without the necessity of patient‐specific measurements. A number of reports have described PSQA for linac‐based SRS and SBRT . In general, these articles described results similar to those we achieved with our PSQA program.…”

Section: Discussionsupporting

confidence: 73%

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Development and validation of a comprehensive patient‐specific quality assurance program for a novel stereotactic radiation delivery system for breast lesions

Becker

Niu

Mutaf

et al. 2019

J Applied Clin Med Phys

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Purpose: The GammaPod is a dedicated prone breast stereotactic radiosurgery (SRS) machine composed of 25 cobalt-60 sources which rotate around the breast to create highly conformal dose distributions for boosts, partial-breast irradiation, or neo-adjuvant SRS. We describe the development and validation of a patient-specific quality assurance (PSQA) system for the GammaPod. Methods: We present two PSQA methods: measurement based and calculation based PSQA. The measurements are performed with a combination of absolute and relative dose measurements. Absolute dosimetry is performed in a single point using a 0.053-cc pinpoint ionization chamber in the center of a polymethylmethacrylate (PMMA) breast phantom and a water-filled breast cup. Relative dose distributions are verified with EBT3 film in the PMMA phantom. The calculationbased method verifies point doses with a novel semi-empirical independent-calculation software.Results: The average (± standard deviation) breast and target sizes were 1263 ± 335.3 cc and 66.9 ± 29.9 cc, respectively. All ion chamber measurements performed in water and the PMMA phantom agreed with the treatment planning system (TPS) within 2.7%, with average (max) difference of -1.3% (−1.9%) and −1.3% (−2.7%), respectively. Relative dose distributions measured by film showed an average gamma pass rate of 97.0 ± 3.2 when using a 3%/1 mm criteria. The lowest gamma analysis pass rate was 90.0%. The independent calculation software had average agreements (max) with the patient and QA plan calculation of 0.2% (2.2%) and −0.1% (2.0%), respectively. Conclusion:We successfully implemented the first GammaPod PSQA program.These results show that the GammaPod can be used to calculate and deliver the predicted dose precisely and accurately. For routine PSQA performed prior to treatments, the independent calculation is recommended as it verifies the accuracy of the planned dose without increasing the risk of losing vacuum due to prolonged waiting times.---

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Section: Discussionsupporting

confidence: 73%

“…Kim et al achieved an average gamma of 97.0 ± 2.5% for stereotactic ablative radiotherapy/volumetric‐modulated arc therapy (VMAT) with 2%/1‐mm criteria. Colodro et al achieved an average gamma pass rate of 92.7 ± 2.9% with 3%/1.5‐mm gamma criteria for VMAT SBRT.…”

Section: Discussionmentioning

confidence: 99%

Development and validation of a comprehensive patient‐specific quality assurance program for a novel stereotactic radiation delivery system for breast lesions

Becker

Niu

Mutaf

et al. 2019

J Applied Clin Med Phys

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“…Hence, the demand for reliable patient-specific quality assurance (PSQA) tools has dramatically increased. [7][8][9]10 During the last decade, many new commercial dosimetry tools, and techniques (both hardware and software) have become available for PSQA, replacing more cumbersome film and ionization chamber measurements. 11 Current IMRT and VMAT QA methods which use non-EPID-based QA devices, such as two-dimensional (2D) diode and IC arrays, have several inherent limitations such as reduced density of measurement points, reduced efficiency, and lesser ease of use compared with EPID.…”

Section: Background and Rationalementioning

confidence: 99%

“…Since the publication of TG‐58, there has been widespread implementation of sophisticated treatment delivery techniques such as IMRT, volumetric modulated arc therapy (VMAT), and adaptive radiotherapy (ART). Hence, the demand for reliable patient‐specific quality assurance (PSQA) tools has dramatically increased 7–9,10 . During the last decade, many new commercial dosimetry tools, and techniques (both hardware and software) have become available for PSQA, replacing more cumbersome film and ionization chamber measurements 11 .…”

Section: Introductionmentioning

confidence: 99%

AAPM Task Group Report 307: Use of EPIDs for Patient‐Specific IMRT and VMAT QA

et al. 2023

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PurposeElectronic portal imaging devices (EPIDs) have been widely utilized for patient‐specific quality assurance (PSQA) and their use for transit dosimetry applications is emerging. Yet there are no specific guidelines on the potential uses, limitations, and correct utilization of EPIDs for these purposes. The American Association of Physicists in Medicine (AAPM) Task Group 307 (TG‐307) provides a comprehensive review of the physics, modeling, algorithms and clinical experience with EPID‐based pre‐treatment and transit dosimetry techniques. This review also includes the limitations and challenges in the clinical implementation of EPIDs, including recommendations for commissioning, calibration and validation, routine QA, tolerance levels for gamma analysis and risk‐based analysis.MethodsCharacteristics of the currently available EPID systems and EPID‐based PSQA techniques are reviewed. The details of the physics, modeling, and algorithms for both pre‐treatment and transit dosimetry methods are discussed, including clinical experience with different EPID dosimetry systems. Commissioning, calibration, and validation, tolerance levels and recommended tests, are reviewed, and analyzed. Risk‐based analysis for EPID dosimetry is also addressed.ResultsClinical experience, commissioning methods and tolerances for EPID‐based PSQA system are described for pre‐treatment and transit dosimetry applications. The sensitivity, specificity, and clinical results for EPID dosimetry techniques are presented as well as examples of patient‐related and machine‐related error detection by these dosimetry solutions. Limitations and challenges in clinical implementation of EPIDs for dosimetric purposes are discussed and acceptance and rejection criteria are outlined. Potential causes of and evaluations of pre‐treatment and transit dosimetry failures are discussed. Guidelines and recommendations developed in this report are based on the extensive published data on EPID QA along with the clinical experience of the TG‐307 members.ConclusionTG‐307 focused on the commercially available EPID‐based dosimetric tools and provides guidance for medical physicists in the clinical implementation of EPID‐based patient‐specific pre‐treatment and transit dosimetry QA solutions including intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) treatments.

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“…The papers' topics are reported in measurements of plans modified with known errors rather than by comparing measurements with predicted dose distribution (Alharthi et al 2021b). In many cases, the detectors used for measurement did not have sufficient spatial resolution to adequately sample the treatment volume due to the sparse detector location and large physical separation from each other (Colodro et al 2017, Ramachandran et al 2017, Bruschi et al 2018.…”

Section: Resultsmentioning

confidence: 99%

Patient specific quality assurance in SBRT: a systematic review of measurement-based methods

Malatesta,

Scaggion,

Giglioli

et al. 2023

Phys. Med. Biol.

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This topical review focuses on Patient-Specific Quality Assurance (PSQA) approaches to stereotactic body radiation therapy (SBRT). SBRT requires stricter accuracy than standard radiation therapy due to the high dose per fraction and the limited number of fractions. The review considered various PSQA methods reported in 36 articles between 01/2010-07/2022 for SBRT treatment. In particular comparison among devices and devices designed for SBRT, sensitivity and resolution, verification methodology, gamma analysis were specifically considered. The review identified a list of essential data needed to reproduce the results in other clinics, highlighted the partial miss of data reported in scientific papers, and formulated recommendations for successful implementation of a PSQA protocol.

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Volumetric-modulated arc therapy lung stereotactic body radiation therapy dosimetric quality assurance: A comparison between radiochromic film and chamber array

Cited by 7 publications

References 38 publications

Development and validation of a comprehensive patient‐specific quality assurance program for a novel stereotactic radiation delivery system for breast lesions

Development and validation of a comprehensive patient‐specific quality assurance program for a novel stereotactic radiation delivery system for breast lesions

AAPM Task Group Report 307: Use of EPIDs for Patient‐Specific IMRT and VMAT QA

Patient specific quality assurance in SBRT: a systematic review of measurement-based methods

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