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A system for the acquisition and digital analysis of lower limb flow waveforms
A PC based waveform acquisition and analysis system has been developed for use in aorta-iliac arterial assessment. A Motorola DSP56001 based system containing dual Analog to Digital converters is used to sample phase quadrature demodulated signals from a commercially available continuous wave Dopple...
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| Format: | Thesis |
| Language: | English |
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Division of Biomedical Engineering
2018
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| _version_ | 1867613315682795520 |
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| access_status_str | Open Access |
| author | Smith, Leonard |
| author2 | Capper, Wayne L |
| author_browse | Capper, Wayne L Smith, Leonard |
| author_facet | Capper, Wayne L Smith, Leonard |
| author_sort | Smith, Leonard |
| collection | Thesis |
| description | A PC based waveform acquisition and analysis system has been developed for use in aorta-iliac arterial assessment. A Motorola DSP56001 based system containing dual Analog to Digital converters is used to sample phase quadrature demodulated signals from a commercially available continuous wave Doppler unit. The Power Spectral Density is calculated using an autoregressive model from which the mean velocity waveform is calculated. This waveform is used to calculate the damping factor, vessel compliance and runoff resistance of a simple electrical model of the lower limb arterial circulation using a non-linear regression technique of curve fitting in the time domain. A pilot study using the system shows a significant separation (p < 0.001 Mann Whitney U-test) between the damping factors of a normal control group (quartile range = 0. 15 - 0.25 ; median = 0. 19) and a patient group with angiographically determined aorta-iliac arterial disease (quartile range = 0.45 - 0.89 ; median= 0.49). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/27049 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:10.861Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Division of Biomedical Engineering |
| publisherStr | Division of Biomedical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/27049 A system for the acquisition and digital analysis of lower limb flow waveforms Smith, Leonard Capper, Wayne L Bunn, Anthony E Immelman, E J Biomedical Engineering Blood Flow Velocity - instrumentation Leg - blood supply A PC based waveform acquisition and analysis system has been developed for use in aorta-iliac arterial assessment. A Motorola DSP56001 based system containing dual Analog to Digital converters is used to sample phase quadrature demodulated signals from a commercially available continuous wave Doppler unit. The Power Spectral Density is calculated using an autoregressive model from which the mean velocity waveform is calculated. This waveform is used to calculate the damping factor, vessel compliance and runoff resistance of a simple electrical model of the lower limb arterial circulation using a non-linear regression technique of curve fitting in the time domain. A pilot study using the system shows a significant separation (p < 0.001 Mann Whitney U-test) between the damping factors of a normal control group (quartile range = 0. 15 - 0.25 ; median = 0. 19) and a patient group with angiographically determined aorta-iliac arterial disease (quartile range = 0.45 - 0.89 ; median= 0.49). 2018-01-29T07:13:54Z 2018-01-29T07:13:54Z 1994 Master Thesis Masters MSc (Med) http://hdl.handle.net/11427/27049 eng application/pdf Division of Biomedical Engineering Faculty of Health Sciences University of Cape Town |
| spellingShingle | Biomedical Engineering Blood Flow Velocity - instrumentation Leg - blood supply Smith, Leonard A system for the acquisition and digital analysis of lower limb flow waveforms |
| thesis_degree_str | Master's |
| title | A system for the acquisition and digital analysis of lower limb flow waveforms |
| title_full | A system for the acquisition and digital analysis of lower limb flow waveforms |
| title_fullStr | A system for the acquisition and digital analysis of lower limb flow waveforms |
| title_full_unstemmed | A system for the acquisition and digital analysis of lower limb flow waveforms |
| title_short | A system for the acquisition and digital analysis of lower limb flow waveforms |
| title_sort | system for the acquisition and digital analysis of lower limb flow waveforms |
| topic | Biomedical Engineering Blood Flow Velocity - instrumentation Leg - blood supply |
| url | http://hdl.handle.net/11427/27049 |
| work_keys_str_mv | AT smithleonard asystemfortheacquisitionanddigitalanalysisoflowerlimbflowwaveforms AT smithleonard systemfortheacquisitionanddigitalanalysisoflowerlimbflowwaveforms |