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Perceptual depth cues in support of medical data visualisation
This work investigates methods to provide clinically useful visualisations of the data produced by an X-ray /CT scanner. Specifically, it examines the use of perceptual depth cues (PDCs) and perceptual depth cue theory to create effective visualisations. Two visualisation systems are explored: one...
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| Format: | Thesis |
| Language: | English |
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Department of Computer Science
2024
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| _version_ | 1867613251063250945 |
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| access_status_str | Open Access |
| author | Lyness, Caleb A |
| author2 | Blake, Edwin |
| author_browse | Blake, Edwin Lyness, Caleb A |
| author_facet | Blake, Edwin Lyness, Caleb A |
| author_sort | Lyness, Caleb A |
| collection | Thesis |
| description | This work investigates methods to provide clinically useful visualisations of the data produced by an X-ray /CT scanner. Specifically, it examines the use of perceptual depth cues (PDCs) and perceptual depth cue theory to create effective visualisations. Two visualisation systems are explored: one to display X-ray data and the other to display volumetric data. The systems are enhanced using stereoscopic and motion PDCs. The presented analyses show that these are the only possible enhancements common to both systems. The theoretical and practical aspects of implementing these enhancements are presented. Volume rendering techniques are explored to find an approach which gracefully handles poorly sampled data and provides the interactive rendering needed for motion cues. A low cost real time volume rendering system is developed and a novel stereo volume rendering technique is presented. The developed system uses commodity graphics hardware and Open-GL. To evaluate the visualisation systems a task-based user test is designed and implemented. The test requires the subjects to be observed while they complete a 3D diagnostic task using each system. The speed and accuracy with which the task is performed are used as metrics. The experimental results are used to compare the effectiveness of the augmented perceptual depth cues and to cross-compare the systems. The experiments show that the user performance in the visualisation systems are statistically equivalent. This suggests that the enhanced X-ray visualisation can be used in place of CT data for some tasks. The benefits of this are two fold: a decrease in the patient's exposure to radiation and a reduction in the data acquisition time. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/40052 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:10.259Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Department of Computer Science |
| publisherStr | Department of Computer Science |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/40052 Perceptual depth cues in support of medical data visualisation Lyness, Caleb A Blake, Edwin Marais, Patrick Science This work investigates methods to provide clinically useful visualisations of the data produced by an X-ray /CT scanner. Specifically, it examines the use of perceptual depth cues (PDCs) and perceptual depth cue theory to create effective visualisations. Two visualisation systems are explored: one to display X-ray data and the other to display volumetric data. The systems are enhanced using stereoscopic and motion PDCs. The presented analyses show that these are the only possible enhancements common to both systems. The theoretical and practical aspects of implementing these enhancements are presented. Volume rendering techniques are explored to find an approach which gracefully handles poorly sampled data and provides the interactive rendering needed for motion cues. A low cost real time volume rendering system is developed and a novel stereo volume rendering technique is presented. The developed system uses commodity graphics hardware and Open-GL. To evaluate the visualisation systems a task-based user test is designed and implemented. The test requires the subjects to be observed while they complete a 3D diagnostic task using each system. The speed and accuracy with which the task is performed are used as metrics. The experimental results are used to compare the effectiveness of the augmented perceptual depth cues and to cross-compare the systems. The experiments show that the user performance in the visualisation systems are statistically equivalent. This suggests that the enhanced X-ray visualisation can be used in place of CT data for some tasks. The benefits of this are two fold: a decrease in the patient's exposure to radiation and a reduction in the data acquisition time. 2024-06-28T12:54:00Z 2024-06-28T12:54:00Z 2004 2024-06-27T20:03:03Z Thesis / Dissertation Masters Masters http://hdl.handle.net/11427/40052 eng application/pdf Department of Computer Science Faculty of Science |
| spellingShingle | Science Lyness, Caleb A Perceptual depth cues in support of medical data visualisation |
| thesis_degree_str | Master's |
| title | Perceptual depth cues in support of medical data visualisation |
| title_full | Perceptual depth cues in support of medical data visualisation |
| title_fullStr | Perceptual depth cues in support of medical data visualisation |
| title_full_unstemmed | Perceptual depth cues in support of medical data visualisation |
| title_short | Perceptual depth cues in support of medical data visualisation |
| title_sort | perceptual depth cues in support of medical data visualisation |
| topic | Science |
| url | http://hdl.handle.net/11427/40052 |
| work_keys_str_mv | AT lynesscaleba perceptualdepthcuesinsupportofmedicaldatavisualisation |