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A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities.
Thesis (MSc)--Stellenbosch University, 2022.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2022
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| _version_ | 1867613887403130880 |
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| access_status_str | Open Access |
| author | Boonzaier, Willem Petrus Engelbrecht |
| author2 | Trauernicht, C. J. |
| author_browse | Boonzaier, Willem Petrus Engelbrecht Trauernicht, C. J. |
| author_facet | Trauernicht, C. J. Boonzaier, Willem Petrus Engelbrecht |
| author_sort | Boonzaier, Willem Petrus Engelbrecht |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2022. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/124540 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:43:16.997Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/124540 A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. Boonzaier, Willem Petrus Engelbrecht Trauernicht, C. J. Stellenbosch University. Faculty of Medicine and Health Sciences. Dept. of Medical Imaging and Clinical Oncology. Medical Physics. Linear accelerators -- Computer simulation -- South Africa Radiation dosimetry -- South Africa Radiotherapy -- South Africa Cancer -- Radiotherapy -- South Africa UCTD Thesis (MSc)--Stellenbosch University, 2022. ENGLISH SUMMARY: When patients are treated with modern radiotherapy, multi-leaf collimators (MLC) are used to shape treatment fields. With recent advances in technology, MLCs have also been used to modulate dose in certain areas inside patients to obtain better treatment outcomes. For the desired treatment outcomes to be valid, the equipment used to deliver the radiotherapy must function optimally. This study was aimed at creating software that can measure the accuracy of the MLC independently with routine picket fence test measurements. With this in place, the software was used to conduct a national survey of the accuracy of MLC systems on various medical linear accelerators in South Africa. Using on-board imaging and the in-house created software, MLC position and width errors could be found efficiently and with a very low degree of user input. When the results from the software were validated with measurements, other commercial software, and log files from linear accelerators, the average errors found agreed within 0.27mm, 0.49mm and 0.11mm for the measurements, commercial software and log file comparisons respectively. A national survey could be done with data from participating volunteer centres. A distinction could be made between units with more advanced capabilities such as VMAT and SRS capabilities by including picket fence tests acquired during arc delivery and picket fence tests done as a measure of the performance of the MLC for VMAT and SRS applications. The results showed that the software was easy and non-costly to compile. Results indicate that the software is robust enough to be used across a multitude of vendor types but sensitive enough to detect MLC errors in the order of 1 pixel of the onboard detector used. The software indicated that all units that participated in this study met the national standards of 2mm MLC accuracy. SRS capable units all had MLC accuracies under 1mm. AFRIKAANSE OPSOMMING: Geen opsomming Masters 2022-02-24T08:59:15Z 2022-04-29T09:18:45Z 2022-02-24T08:59:15Z 2022-04-29T09:18:45Z 2022-04 Thesis http://hdl.handle.net/10019.1/124540 en_ZA Stellenbosch University 159 pages : illustrations, includes annexures application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Linear accelerators -- Computer simulation -- South Africa Radiation dosimetry -- South Africa Radiotherapy -- South Africa Cancer -- Radiotherapy -- South Africa UCTD Boonzaier, Willem Petrus Engelbrecht A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. |
| title | A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. |
| title_full | A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. |
| title_fullStr | A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. |
| title_full_unstemmed | A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. |
| title_short | A multi-institutional quantitative survey of multi-leaf collimator accuracy using a digital picket fence test with sub-millimetre detection capabilities. |
| title_sort | multi institutional quantitative survey of multi leaf collimator accuracy using a digital picket fence test with sub millimetre detection capabilities |
| topic | Linear accelerators -- Computer simulation -- South Africa Radiation dosimetry -- South Africa Radiotherapy -- South Africa Cancer -- Radiotherapy -- South Africa UCTD |
| url | http://hdl.handle.net/10019.1/124540 |
| work_keys_str_mv | AT boonzaierwillempetrusengelbrecht amultiinstitutionalquantitativesurveyofmultileafcollimatoraccuracyusingadigitalpicketfencetestwithsubmillimetredetectioncapabilities AT boonzaierwillempetrusengelbrecht multiinstitutionalquantitativesurveyofmultileafcollimatoraccuracyusingadigitalpicketfencetestwithsubmillimetredetectioncapabilities |