Monitoring Linear Accelerator Output Constancy Using the PTW Linacheck

McDermott, G.; Buckle, A.

doi:10.1016/j.meddos.2009.12.001

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…This guideline also enables each radiotherapy center to appropriately reduce the monitoring frequency according to the business characteristics and workload of the particular unit. We obtained the same conclusion as Mcdermott et al (18) We all believe that a morning quality check of the linear accelerator is useful for monitoring the stability of the output parameters of the linear accelerator at two measurements based on the ionization chamber, which can be confirmed and debugged at the ionization chamber in a timely manner when a problem is detected.…”

Section: Discussionsupporting

confidence: 78%

“…According to retrospective studies, the clinical tolerance for random and systematic uncertainties and variations in the output trends of a linear accelerator should be within ±3% (11)(12)(13)(14)(15)(16)(17) . Some scholars suggest that the detection equipment requires sufficient accuracy and precision to detect this level of variation (18,19) .…”

Section: Introductionmentioning

confidence: 99%

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Systematic and comprehensive analysis of the dose-response characteristics of a morning quality check of a linear accelerator and an important application of accelerator performance prediction

et al. 2020

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Background: This paper aimed to analyze the output constancy of a medical linear accelerator using PTW QUICKCHECK webline and studied the sensitivity of the PTW QUICKCHECK webline . Materials and Methods: The paper statistically analyzed the output doses of 6 MV and 10 MV of photons and 6 MeV, 9 MeV, and 12 MeV of electrons from a medical linear accelerator measured before the daily treatment to assess the output stability of a medical linear accelerator. Some modifications were introduced by artificially altering the external irradiation conditions, and the percent variations from baseline values were noted. The gantry angle was changed and some deviations were established in the vertical, longitudinal and lateral directions to study the sensitivity of the PTW QUICKCHECK webline . The beam flatness, symmetry, radiation quality and output energy of 6 MV of photon energy were statistically analyzed. Results: Among the measurements, no parameters exceeded the tolerance of ±3%. QUICKCHECK webline was capable of detecting the variations in the central axis dose, flatness, symmetry and radiation quality under the testing conditions. Similar to the photon energy, electron energy measurements also confirmed that the detector was sensitive to a small variation in output introduced by the testing conditions. An important application of accelerator performance prediction in this study confirms the irreplaceable and important function of morning quality checks of a linear accelerator. Conclusions: The output dose measured before daily treatment using PTW QUICKCHECK webline to analyze the linear accelerator output constancy helps to decrease the system error, effectively reduces the errors of the accelerator system, and avoids serious mistakes.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Systematic and comprehensive analysis of the dose-response characteristics of a morning quality check of a linear accelerator and an important application of accelerator performance prediction

et al. 2020

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“…An established daily output dose monitoring mechanism and an effective routine (daily/ weekly/ monthly) measurement system should be an essential part of radiation therapy linear accelerator system quality assurance [1,2]. Similar study have been performed elsewhere [9,10,12,14,19,20] where various dosimetric parameters of the linear accelerator were studied with the help of different daily QA equipment. Nicewonger D et.…”

Section: Discussionmentioning

confidence: 86%

“…Daily QA, having the highest frequency, are used to evaluate radiotherapy machines prior to using them in daily practice of treating patients. Multiple systems are utilized to perform daily QA in clinical radiotherapy [8][9][10][11][12][13][14][15][16][17]. Daily morning QA are generally done with conventional phantom that, besides being time consuming, only measures beam quality via Tissue Phantom Ratio (TPR 20,10 ), for available photon beams.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Linear Accelerator Output Constancy and Overall Performance Using the PTW Quickcheckwebline

et al. 2022

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Daily morning quality assurance (QA) for all available beams using conventional phantom measures only output and beam quality. PTW QUICKCHECKwebline (PTW QCw) is a compact movable light-weight dosimetry equipment used for daily QA, capable of measuring flatness, symmetry, beam quality and output constancy of a given beam in a single exposure. The purpose of this study was to analyze and monitor the output constancy of a medical linear accelerator using PTW QCw and assess the overall performance of the PTW QCw. The output parameters of 4, 6 and 15 MV photon beams and 4, 6, 8, 10, 12 and 15 MeV electron beams of the Elekta Synergy linear accelerator in Kathmandu Cancer Center were analyzed. It was found in the study that all the parameters were well within the recommended tolerance limit of ±3%. Some known modifications in the settings of the linear accelerator gantry, couch, and collimator were introduced separately during the exposures, and the percentage variations from the baseline values were noted to check the sensitivity of the PTW QCw using 6 MV photon beam. The PTW QCw was able to detect the deviations introduced to the external irradiation conditions for both photon and electron beams under daily testing conditions. The results from this study suggest that daily dosimetric consistency measurements using the PTW QCw helps to monitor the overall performance of the linear accelerator.

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“…Several studies were undertaken to validate MPC with other output measurement devices. Barnes et al 4 evaluated MPC beam output change with an ionization chamber (IC) whereas others 5,6 were focused on geometry tests using (IsoCal) phantom.…”

Section: Introductionmentioning

confidence: 99%

Bland and Altman analysis: Machine performance check output

Rodríguez¹

2023

Int. J. Sci. Res. Updates

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Background: The aim of this study was to evaluate the variation in the daily output of a linac Varian Edge TrueBeam over a month, using a Daily QA3 (QA3) and machine performance check (MPC), after Task Group 51protocol and baseline data had been established. Methods and Materials: The daily output data were collected for all photons (6, 10 MV, and 6, 10 FFF) and electrons (6, 9, 12, and 15 MeV) energies. A Bland-Altman-Plot and intraclass correlation coefficients were used to assess agreement and reliability. Results: MPC data showed small random deviations of ≤ 2% and agreed with the QA3 measurements. The maximum mean absolute difference between the QA3 and MPC data was observed with 6 MeV (0.5633), with limits of agreement of (−0.5392–1.6658). Conclusion: These results suggest that MPC data closely track QA3 data and that the two forms are interchangeable

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Monitoring Linear Accelerator Output Constancy Using the PTW Linacheck

Cited by 5 publications

References 6 publications

Systematic and comprehensive analysis of the dose-response characteristics of a morning quality check of a linear accelerator and an important application of accelerator performance prediction

Systematic and comprehensive analysis of the dose-response characteristics of a morning quality check of a linear accelerator and an important application of accelerator performance prediction

Monitoring Linear Accelerator Output Constancy and Overall Performance Using the PTW Quickcheckwebline

Bland and Altman analysis: Machine performance check output

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