Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance

Stepanek, Chris J; Haynes, J.; Fletcher, Sally

doi:10.1016/j.phro.2023.100418

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…The interest on this topic is confirmed by the increase of articles focused on this point, which doubles every three years. Moreover, a new generation device based on complementary metal oxide semiconductor detectors was recently introduced with a pixel based resolution without any spacing (Stepanek et al 2023) and it proved to be suitable for routine verification (Padelli et al 2022).…”

Section: Discussion and Recommendationsmentioning

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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Section: Discussion and Recommendationsmentioning

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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“…Currently, the same correction factor is applied to all pixels, independent of their location on the sensor area. A previous characterization of the sensor at a C‐arm Linac concluded that this type of angular correction is sufficient 9 . Note that iso‐centric setup was used for this experiment because the angle between the radiation beam and the detector plan can be accurately known.…”

Section: Methodsmentioning

confidence: 99%

“…A previous characterization of the sensor at a C-arm Linac concluded that this type of angular correction is sufficient. 9 Note that iso-centric setup was used for this experiment because the angle between the radiation beam and the detector plan can be accurately known. The LUT would still be applicable to non-isocentric plans.…”

Section: Accounting For Angular Dependencymentioning

confidence: 99%

Angular correction methodology and characterization of a high‐resolution CMOS array for patient specific quality assurance on a robotic arm linac

Ashraf,

Krimmer,

Zalavri

et al. 2023

J Applied Clin Med Phys

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PurposeTo develop an angular correction methodology and characterize a high‐resolution complementary metal‐oxide‐semiconductor (CMOS) array for patient specific quality assurance on a robotic arm linear accelerator.MethodsBeam path files from the treatment planning software (TPS) were used to calculate the angle of radiation beam with respect to the detector plane. Beams from multiple discrete angles were delivered to the CMOS detector array and an angular dependency look up table (LUT) was created. The LUT was then used to correct for the angular dependency of the detector. An iso‐centric 5 mm fixed cone, non iso‐centric multi‐target fixed cone, 10 mm Iris and a multi‐leaf collimator (MLC) based collimated plan were delivered to the phantom and compared to the TPS with and without angular correction applied. Additionally, the CMOS array was compared to gafchromic film and a diode array.ResultsLarge errors of up to 30% were observed for oblique angles. When angular correction was applied, the gamma passing rate increased from 99.2% to 100% (average gamma value decreased from 0.29 to 0.14) for the 5‐mm iso‐centric cone plan. Similarly, the passing rate increased from 84.0% to 100% for the Iris plan and from 49.98% to 98.4% for the MLC plan when angular correction was applied. For the multi‐target plan, applying angular correction improved the gamma passing rate from 94% to 99.6%. The 5 mm iso‐centric fixed cone plan was also delivered to film, and the gamma passing rate was 91.3% when using gafchromic film as the reference dataset, whereas the diode array provided insufficient sampling for this plan.ConclusionA methodology of calculating the beam angle based on the beam path files was developed and validated. The array was demonstrated to be superior to other quality assurance tools because of its sub‐millimeter spatial resolution and immediate read out of the results.

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“…al [9] evaluated the performance on an Elekta Versa HD. This paper aims to describe the commissioning and implementation experience of the myQA SRS device for both SRS and SBRT treatments veri cation on a Varian TrueBeam STx linear accelerator (linac),characterise its performance for stereotactic beam PSQA and determine the potential for the device for MLC QA.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive characterisation of the IBA myQA SRS for SRS and SBRT patient specific quality assurance

Junis,

Yousif,

Stensmyr

et al. 2024

Phys Eng Sci Med

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The IBA myQA SRS device is a new to market 2D CMOS detector array with an active area 140x120 mm 2 and 0.4 mm resolution, making it a potential real-time dosimetry alternative to lm veri cation for stereotactic plan veri cations. Characterisation of the device was performed to assess performance. The devices dosimetric properties were measured for 6X and 6FFF beams from a Varian TrueBeam STx with HD-MLC. Clinical suitability of the device for PSQA was veri ed using ten SRS/SBRT plans, compared against other detectors, as well as MLC tests including picket fence and chair. Gamma analysis was performed using myQA software with criteria of 4%/1mm.The device demonstrated compliance with recommended speci cations for basic tests. After the required warm-up period, the maximum deviation in detector signal from initial readings was 0.2%. Short-term and long-term reproducibility was 0.1%(6X) and 1%(6FFF), respectively. Dose linearity was within 0.3%(6X) and 0.7%(6FFF) and dose-rate dependence within 1.70%(6X), and 2.93%(6FFF) compared to ionization chamber measurements. Angular dependence was quanti ed for coplanar and non-coplanar situations. Output factors and beam pro les showed agreements within 1% with the CC04 and CC13 chambers for eld sizes 1x1 to 10x10cm 2 . The minimum gamma (4%/1mm) pass rates for MLC-pattern tests were 96% and 98% for the myQA SRS device and lm, respectively. The average gamma (4%/1mm) pass rates for SBRT and SRS plans were 98.8% and 99.8% respectively. This work represents one of the rst studies performed on the commissioning and performance characterisation of this novel device, demonstrating its accuracy and reliability, making it highly useful as a lm alternative in stereotactic treatment plan veri cation.

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Evaluation of a complementary metal oxide semiconductor detector as a tool for stereotactic body radiotherapy plan quality assurance

Cited by 5 publications

References 25 publications

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

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

Angular correction methodology and characterization of a high‐resolution CMOS array for patient specific quality assurance on a robotic arm linac

Comprehensive characterisation of the IBA myQA SRS for SRS and SBRT patient specific quality assurance

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