Statistical control process to compare and rank treatment plans in radiation oncology: impact of heterogeneity correction on treatment planning in lung cancer

Chaikh, Abdulhamid; Balosso, Jacques

doi:10.21037/tlcr.2016.09.04

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…For IMRT QA using the Gafchromic EBT3 film dosimetry, it requires an efficient data analysis tool. 41,42 GAH is an efficient tool to calculate DD for IMRT QA because it can indicate the region where calculated dose differs from the measurement. The DDs calculated by GAHs have to ensure that the dimensions are properly registered with planned dose within the analysing software so that we can approximate the limits of dose beam modelling and calculation algorithms.…”

Section: Resultsmentioning

confidence: 99%

Selection of gamma analysis acceptance criteria in IMRT QA using Gafchromic EBT3 film dosimetry

et al. 2018

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Background and purposeThis study reported the justification and selection of acceptable γ criteria with respect to low (6 MV) and high (15 MV) photon beams for intensity-modulated radiation therapy quality assurance (IMRT QA) using the Gafchromic external beam therapy 3 (EBT3) film.Materials and methodsFive-field step-and-shoot IMRT was used to treat 16 brain IMRT patients using the dual-energy DHX-S linear accelerator (Varian Medical System, Palo Alto, CA, USA). Dose comparisons between computed values of the treatment planning system (TPS) and Gafchromic EBT3 film were evaluated based on γ analysis using the Film QA Pro software. The dose distribution was analysed with gamma area histograms (GAHs) generated using different γ criteria (3%/2 mm, 3%/3 mm and 5%/3 mm) for the 6 and 15 MV photon beams, to optimise the best distance-to-agreement (DTA) criteria with respect to the beam energy.ResultsFrom the comparison between the dose distributions acquired from the TPS and EBT3 film, a DTA criterion of 3%/2 mm showed less dose differences (DDs) with passing rates up to 93% for the 6 MV photon beams, while for the 15 MV a relaxed DTA criterion of 5%/3 mm was consistent with the DD acceptability criteria with a 95% passing rate.ConclusionsOur results suggested that high-energy photon beams required relaxed DTA criteria for the brain IMRT QA, while low-energy photon beams showed better results even with tight DTA criteria.

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Section: Resultsmentioning

confidence: 99%

Selection of gamma analysis acceptance criteria in IMRT QA using Gafchromic EBT3 film dosimetry

et al. 2018

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“…The process capability index (Cpk) that represented the process behavior was utilized to assess the state of QC process. The Cpk demonstrated how data set closed to CL when considering its mean (15,28) . If the Cpk was more than 1, the process variation was within the specification limits.…”

Section: Data Collection and Analysismentioning

confidence: 99%

“…Compared to the number of articles and conference abstracts for radiation therapy using SPC, the proportion of setup uncertainty in radiation therapy is 14.71% as shown in figure 1. A plethora of papers reports the SPC is applied comprehensively to QC and QA for beam output and symmetry, dose, treatment plan and proton beam range design in radiotherapy, but less for NPC patient setup uncertainty (13)(14)(15)(16) . This is beyond our expectation, so it necessitates us paying more attention to NPC patient positioning reproducibility using SPC tools.…”

Section: Introductionmentioning

confidence: 99%

Statistical process control tools for setup reproducibility in quality control practices during nasopharyngeal carcinoma radiotherapy

Li²,

J.³

et al. 2022

Int J Radiat Res

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Background: This study aims to perform quality control (QC) practices for setup reproducibility during radiotherapy for nasopharyngeal carcinoma (NPC) using statistical process control (SPC) tools. Materials and Methods: A total of 480 fractional images from 48 NPC patients with the first 10 fractions of the treatment were collected. In QC practices, setup errors were described using the histogram and normal curve, cumulative frequencies of absolute setup errors and 3D Euclidean Distance (E u ) were analyzed; the X ̅ -S chart and process capability index (Cpk) with the variable E u were utilized to identify whether the outlier occurred and to evaluate the QC process. Results: The translational setup error distributions were almost normal in Lateral, Longitudinal and Vertical directions and were narrower in Lateral and Vertical directions. Vertical translational errors and E u with a larger magnitude sag appeared the most frequently. Between the couch sag and no sag, the E u mean of 7 to 7 NPC patients with the same 3 patients was out of control and the standard deviation of E u of nil to 2 patients was outlier based on the X ̅ -S chart, and the Cpk was 1.05 and 1.36 respectively, when the specification limit of translational errors was ±3 mm. Conclusion: Daily imaging is necessary to increase setup reproducibility for NPC patients and more measures should be taken to facilitate quality assurance procedures. SPC is better applied to QC practices depending on the reliable data and the acceptable tolerance levels in further studies.

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Moving towards process-based radiotherapy quality assurance using statistical process control

Raveendran,

P.T.

et al. 2023

Physica Medica

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Statistical control process to compare and rank treatment plans in radiation oncology: impact of heterogeneity correction on treatment planning in lung cancer

Cited by 4 publications

References 18 publications

Selection of gamma analysis acceptance criteria in IMRT QA using Gafchromic EBT3 film dosimetry

Selection of gamma analysis acceptance criteria in IMRT QA using Gafchromic EBT3 film dosimetry

Statistical process control tools for setup reproducibility in quality control practices during nasopharyngeal carcinoma radiotherapy

Moving towards process-based radiotherapy quality assurance using statistical process control

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