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The development of a real-time photogrammetric system for patient positioning in proton therapy
This thesis concerns the development of a real-time photogrammetric system for the positioning of patients undergoing proton therapy. The positioning of patients involves moving their tumours into a horizontal proton beam. In the past, patients have been mechanically positioned and restrained. Howev...
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| Format: | Thesis |
| Language: | English English |
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Division of Geomatics
2026
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| _version_ | 1867613246528159744 |
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| access_status_str | Open Access |
| author | Van der Vlugt, Graeme |
| author2 | Ruther, Heinz |
| author_browse | Ruther, Heinz Van der Vlugt, Graeme |
| author_facet | Ruther, Heinz Van der Vlugt, Graeme |
| author_sort | Van der Vlugt, Graeme |
| collection | Thesis |
| description | This thesis concerns the development of a real-time photogrammetric system for the positioning of patients undergoing proton therapy. The positioning of patients involves moving their tumours into a horizontal proton beam. In the past, patients have been mechanically positioned and restrained. However, with the development of this new "StereoPhotoGrammetric" (SPG) system, patients will be positioned using CCD cameras and digital photogrammetric techniques. A specially designed mechanical chair will move the patients at the command of the SPG system. The tumour is located relative to reference targets on a patient's head using medical imaging. In the treatment room these same targets are imaged and identified by the SPG system. The positions of these reference targets are determined in three-dimensional space and hence the relative position of the tumour can be computed. Using this knowledge, the mechanical chair is automatically sent instructions to move the patient into the desired treatment position. Once the proton beam is switched on, the SPG system monitors the patient in order to detect any movements. The beam is immediately switched off if any substantial movement takes place. As a basis, some general theory of photogrammetry is covered. The development of reliable and efficient processing routines for the SPG system and the photogrammetric procedures involved in the system, are reported in detail. The routines are composed of a combination of automatic and computer-aided manual processes. The reliability and efficiency of these various routines are evaluated. The hardware and software were successfully integrated into a functional unit, capable of positioning and monitoring patients. A number of tests of target positioning accuracy were executed with the SPG system and satisfactory results were achieved. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/42873 |
| institution | University of Cape Town (South Africa) |
| language | English eng |
| last_indexed | 2026-06-10T12:33:05.164Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| publisher | Division of Geomatics |
| publisherStr | Division of Geomatics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/42873 The development of a real-time photogrammetric system for patient positioning in proton therapy Van der Vlugt, Graeme Ruther, Heinz Geomatics This thesis concerns the development of a real-time photogrammetric system for the positioning of patients undergoing proton therapy. The positioning of patients involves moving their tumours into a horizontal proton beam. In the past, patients have been mechanically positioned and restrained. However, with the development of this new "StereoPhotoGrammetric" (SPG) system, patients will be positioned using CCD cameras and digital photogrammetric techniques. A specially designed mechanical chair will move the patients at the command of the SPG system. The tumour is located relative to reference targets on a patient's head using medical imaging. In the treatment room these same targets are imaged and identified by the SPG system. The positions of these reference targets are determined in three-dimensional space and hence the relative position of the tumour can be computed. Using this knowledge, the mechanical chair is automatically sent instructions to move the patient into the desired treatment position. Once the proton beam is switched on, the SPG system monitors the patient in order to detect any movements. The beam is immediately switched off if any substantial movement takes place. As a basis, some general theory of photogrammetry is covered. The development of reliable and efficient processing routines for the SPG system and the photogrammetric procedures involved in the system, are reported in detail. The routines are composed of a combination of automatic and computer-aided manual processes. The reliability and efficiency of these various routines are evaluated. The hardware and software were successfully integrated into a functional unit, capable of positioning and monitoring patients. A number of tests of target positioning accuracy were executed with the SPG system and satisfactory results were achieved. 2026-02-20T09:40:46Z 2026-02-20T09:40:46Z 1991 2024-07-19T10:53:37Z Thesis / Dissertation Masters MSc http://hdl.handle.net/11427/42873 en eng application/pdf Division of Geomatics Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Geomatics Van der Vlugt, Graeme The development of a real-time photogrammetric system for patient positioning in proton therapy |
| thesis_degree_str | Master's |
| title | The development of a real-time photogrammetric system for patient positioning in proton therapy |
| title_full | The development of a real-time photogrammetric system for patient positioning in proton therapy |
| title_fullStr | The development of a real-time photogrammetric system for patient positioning in proton therapy |
| title_full_unstemmed | The development of a real-time photogrammetric system for patient positioning in proton therapy |
| title_short | The development of a real-time photogrammetric system for patient positioning in proton therapy |
| title_sort | development of a real time photogrammetric system for patient positioning in proton therapy |
| topic | Geomatics |
| url | http://hdl.handle.net/11427/42873 |
| work_keys_str_mv | AT vandervlugtgraeme thedevelopmentofarealtimephotogrammetricsystemforpatientpositioninginprotontherapy AT vandervlugtgraeme developmentofarealtimephotogrammetricsystemforpatientpositioninginprotontherapy |