Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging
Dissertation (MSc)--University of Pretoria, 2011.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Published: |
University of Pretoria
2013
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613576673361920 |
|---|---|
| access_status_str | Open Access |
| author2 | Sathekge, Mike Machaba |
| author_browse | Sathekge, Mike Machaba |
| author_facet | Sathekge, Mike Machaba |
| collection | Thesis |
| dc_rights_str_mv | © 2010, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2011. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26128 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:38:21.029Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/26128 Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging Sathekge, Mike Machaba s2763625@tuks.co.za Katua, Agatha Mary Osem Filtered back projection Bladder artifacts Pelvic UCTD Dissertation (MSc)--University of Pretoria, 2011. Bladder artifacts during bone single photon emission computed tomography (SPECT) is a common source of errors. The extent and severity of bladder artifacts have been described for filtered back projection (FBP) reconstruction. OSEM may help to address this poor record of bladder artifacts, which render up to 20% of the images unreadable. Aims and objectives To evaluate the relationship of the bladder to acetabulum ratio in guiding the choice of the number of iterations and subsets used for OSEM reconstruction, for reducing bladder artifacts found on FBP reconstruction. Materials and Methods 105 patients with various indications for bone scans were selected and planar and SPECT images were acquired. The SPECT images were reconstructed with both filtered back projection and OSEM using four different combinations of iterations and subsets. The images were given to three well experienced Nuclear Physicians who were blinded to the diagnosis and type of reconstruction used. They then labelled images from the best to the worst after which the data was analysed. The bladder to acetabulum ratio for each image was determined which was then correlated with the different iterations and subsets used. Results The study demonstrated that reconstruction using OSEM led to better lesion detectability compared to filtered back projection in 87.62% of cases. It further demonstrated that the iterations and subsets used for reconstruction of an image correlates to the bladder to acetabulum ratio. Four iterations and 8 subsets yielded the best results in 48.5% of the images whilst two iterations and 8 subsets yielded the best results in 33.8%. The number of reconstructed images which yielded the best results with 2 iterations and 8 subsets were the same as or more than those with 4 iterations and 8 subsets when the bladder/acetabulum ratio was between 0.2-0.39. A ratio below 0.2 or above 0.39 supports the usage of 4 iterations and 8 subsets over 2 iterations and 8 subsets. Conclusion Bladder to acetabulum ratio can be used to select the optimum number of iterations and subsets for reconstruction of bone SPECT for accurate characterization of lesions. This study also confirms that reconstruction with OSEM (vs FBP) leads to better lesion detectability and characterisation. Nuclear Medicine unrestricted 2013-09-07T02:41:00Z 2011-07-14 2013-09-07T02:41:00Z 2011-04-08 2011-07-14 2011-07-08 Dissertation Katau, AM 2010, Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26128 > E11/302/gm http://hdl.handle.net/2263/26128 http://upetd.up.ac.za/thesis/available/etd-07082011-151635/ © 2010, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Osem Filtered back projection Bladder artifacts Pelvic UCTD Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging |
| title | Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging |
| title_full | Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging |
| title_fullStr | Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging |
| title_full_unstemmed | Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging |
| title_short | Comparison of filtered back projection and Osem in reducing bladder artifacts in pelvic spect imaging |
| title_sort | comparison of filtered back projection and osem in reducing bladder artifacts in pelvic spect imaging |
| topic | Osem Filtered back projection Bladder artifacts Pelvic UCTD |
| url | http://hdl.handle.net/2263/26128 http://upetd.up.ac.za/thesis/available/etd-07082011-151635/ |