Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy

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dc.contributor.advisorVaughan, Christopher Leonard (Kit)en_ZA
dc.contributor.authorHough, Jan Ken_ZA
dc.date.accessioned2018-01-09T14:11:43Z
dc.date.available2018-01-09T14:11:43Z
dc.date.issued1999en_ZA
dc.descriptionSummary in English.en_ZA
dc.descriptionBibliography: pages 125-129.en_ZA
dc.description.abstractThis thesis describes the construction and use of the facemask at the National Accelerator Centre (NAC) as used to both immobilise and position patients for precision proton radiotherapy. The precision achieved using the stereophotogrammetric (SPG) positioning system is measured, and the shortcomings and errors in using the facemask by the SPG system are measured and analysed. The implementation of improvements made to the SPG system is reported upon, and alternative means of both supporting the fiducial markers and immobilising the patient are investigated and evaluated. The accuracy of positioning a facemask using the SPG system is 1.4 mm and of positioning a newly designed frame is 1.6 mm. These measurements were made without using a patient. It is estimated that the total uncertainty of positioning a patient's tumour at the isocentre is 1.6 (1SD) mm using the facemask and it is estimated that the precision using the frame will be less than this value. The largest component of this error (1.39 mm) is due to the error in obtaining the CT scanner co-ordinates. These results are comparable to those obtained by other investigators. The movement of patient bony landmarks within the facemask was measured to be 1.0 ± 0.8 mm. Three main recommendations are that the CT scanner co-ordinating procedure be improved, the SPG computer program be rewritten in parts to achieve greater speed and accuracy, and that the new frame be used. The frame is easier to manufacture than the facemask and allows real time monitoring of the position of the patient's head by the SPG system thus allowing faster throughput of patients and better positioning quality control.en_ZA
dc.identifier.apacitationHough, J. K. (1999). <i>Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy</i>. (Thesis). University of Cape Town ,Faculty of Health Sciences ,Division of Medical Physics. Retrieved from http://hdl.handle.net/11427/26784en_ZA
dc.identifier.chicagocitationHough, Jan K. <i>"Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy."</i> Thesis., University of Cape Town ,Faculty of Health Sciences ,Division of Medical Physics, 1999. http://hdl.handle.net/11427/26784en_ZA
dc.identifier.citationHough, J. 1999. Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hough, Jan K AB - This thesis describes the construction and use of the facemask at the National Accelerator Centre (NAC) as used to both immobilise and position patients for precision proton radiotherapy. The precision achieved using the stereophotogrammetric (SPG) positioning system is measured, and the shortcomings and errors in using the facemask by the SPG system are measured and analysed. The implementation of improvements made to the SPG system is reported upon, and alternative means of both supporting the fiducial markers and immobilising the patient are investigated and evaluated. The accuracy of positioning a facemask using the SPG system is 1.4 mm and of positioning a newly designed frame is 1.6 mm. These measurements were made without using a patient. It is estimated that the total uncertainty of positioning a patient's tumour at the isocentre is 1.6 (1SD) mm using the facemask and it is estimated that the precision using the frame will be less than this value. The largest component of this error (1.39 mm) is due to the error in obtaining the CT scanner co-ordinates. These results are comparable to those obtained by other investigators. The movement of patient bony landmarks within the facemask was measured to be 1.0 ± 0.8 mm. Three main recommendations are that the CT scanner co-ordinating procedure be improved, the SPG computer program be rewritten in parts to achieve greater speed and accuracy, and that the new frame be used. The frame is easier to manufacture than the facemask and allows real time monitoring of the position of the patient's head by the SPG system thus allowing faster throughput of patients and better positioning quality control. DA - 1999 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1999 T1 - Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy TI - Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy UR - http://hdl.handle.net/11427/26784 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/26784
dc.identifier.vancouvercitationHough JK. Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy. [Thesis]. University of Cape Town ,Faculty of Health Sciences ,Division of Medical Physics, 1999 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/26784en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDivision of Medical Physicsen_ZA
dc.publisher.facultyFaculty of Health Sciencesen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMedical Physicsen_ZA
dc.titleAssessment of and improvements to a stereophotogrammetric patient positioning system for proton therapyen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMPhilen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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