Investigation of Elekta AQUA software for kilovoltage to megavoltage radiation isocenter coincidence

Norvill, Craig; Bockelmann, Felix; Patrick, Blumenberg,; Goodall, Simon

doi:10.1007/s13246-021-01014-1

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…Elekta Machine QA can additionally interface with select third-party measurement devices including (but not limited to) the UNIDOS electrometers and STARCHECK detector arrays (PTW, Freiburg, Germany), the SuperMax electrometer and BeamCheck Plus detector array (Standard Imaging, Middleton, WI, USA), and the DailyQA3 and IC Profiler (Sun Nuclear Corporation, Melbourne, FL, USA). As a tool for MIQC, Elekta Machine QA/AQUA has seen limited but ongoing technical evaluation (Norvill et al 2021, Roberts et al 2021, Norvill 2023).…”

Section: Accuray Essential and Advanced Tomotherapy Qa (Tqa)mentioning

confidence: 99%

IPEM topical report: results of a 2022 UK survey on the use of linac manufacturer integrated quality control (MIQC)

Pearson,

Barnes,

Brown

et al. 2023

Phys. Med. Biol.

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In recent years Radiotherapy linear accelerator (linac) vendors have developed their own integrated quality control (QC) systems. Such manufacturer-integrated-quality-control (MIQC) has the potential to improve both the quality and efficiency of linac QC but is currently being developed and utilised in the absence of specific best-practice guidance. An Institute of Physics and Engineering in Medicine working party was commissioned with a view to develop guidance for the commissioning and implementation of MIQC. This study is based upon a survey of United Kingdom (UK) radiotherapy departments performed by the working party. The survey was distributed to all heads of radiotherapy physics in the UK and investigated availability and uptake, community beliefs and opinions, utilisation, user experience and associated procedures. The survey achieved a 95% response rate and demonstrated strong support (>95%) for its use and further development. MIQC systems are available in 79% of respondents’ centres, and are in clinical use in 66%. The most common MIQC system was Varian MPC, in clinical use in 58% of responding centres, with CyberKnife AQA\E2E in 11%, TomoTherapy TQA in 8% and no users of Elekta Machine QA. A majority of users found their MIQC to be easy to use, reliable, and had five or more years of experience. Most users reported occasions of discrepancy in results between MIQC and conventional testing, but the majority considered this acceptable, indicating a false reporting frequency of quarterly or less. MIQC has shown value in preventative maintenance and early detection of machine deviations. There were inconsistent approaches in the utilisation and commissioning tests performed. Fewer than half of users perform QC of MIQC. 45% of responders have modified their QC processes with the introduction of MIQC, via replacement of conventional tests or reduction in their frequency. Future guidance is recommended to assist in the implementation of MIQC.

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Section: Accuray Essential and Advanced Tomotherapy Qa (Tqa)mentioning

confidence: 99%

IPEM topical report: results of a 2022 UK survey on the use of linac manufacturer integrated quality control (MIQC)

Pearson,

Barnes,

Brown

et al. 2023

Phys. Med. Biol.

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“…Before measuring the PSF, the linac isocenter lasers were confirmed to be coincident with the MV isocenter within a tolerance of 0.5 mm via a Winston-Lutz test. [8,9] The PSF was determined by capturing images of the Elekta beam limiting device (BLD) calibration plate, positioned at isocenter. The plate was positioned on the treatment couch and aligned using the linac crosshairs at gantry 0 • and collimator 0 • .…”

Section: Pixel Scale Factor (Psf)mentioning

confidence: 99%

Variation in Elekta iView electronic portal imager pixel scale factor with gantry angle, and impact on multi‐leaf collimator quality assurance

Goodall

Norvill²

2022

J Applied Clin Med Phys

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For Elekta Agility linear accelerators, the iViewGT electronic portal imaging device (EPID) is positioned at a nominal X-Ray source-to-panel distance of 1600 mm. For display, image registration, and data processing purposes, the image pixels are scaled to spatial units at the treatment isocenter plane. This is achieved by applying a pixel scaling factor (PSF). During this investigation, the dependence of the PSF at cardinal gantry angles was determined along with the resulting effects on the multi-leaf collimator (MLC) quality assurance (QA) results for three linear accelerators (linacs). The PSF was found to vary by 0.0018-0.0022 mm/pixel during gantry rotation, which resulted in variations in the mean MLC reported error of up to 0.8 mm at 100 mm off -axis with the gantry rotated to 180 • . Measurement and application of a gantry angle-specific PSF is a simple process that can be implemented to improve the accuracy of EPID-based MLC QA at cardinal gantry angles.

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Accuracy of the catalyst surface guidance system for patient monitoring during cranial SRS treatments

Tonkin¹,

Goodall

2023

Phys Eng Sci Med

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Investigation of Elekta AQUA software for kilovoltage to megavoltage radiation isocenter coincidence

Cited by 5 publications

References 12 publications

IPEM topical report: results of a 2022 UK survey on the use of linac manufacturer integrated quality control (MIQC)

IPEM topical report: results of a 2022 UK survey on the use of linac manufacturer integrated quality control (MIQC)

Variation in Elekta iView electronic portal imager pixel scale factor with gantry angle, and impact on multi‐leaf collimator quality assurance

Accuracy of the catalyst surface guidance system for patient monitoring during cranial SRS treatments

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