Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters
We discuss data filtering prior to image reconstruction. For this kind of filtering, the radial direction of the sinogram is routinely employed. Recently, we have introduced an alternative approach to sinogram data processing, exploiting the angular information in a novel way. This new stackgram rep...
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| Format: | Article |
| Language: | English |
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Wiley
2007-01-01
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| Series: | International Journal of Biomedical Imaging |
| Online Access: | http://dx.doi.org/10.1155/2007/38516 |
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| _version_ | 1832559926516383744 |
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| author | Antti P. Happonen Matti O. Koskinen |
| author_facet | Antti P. Happonen Matti O. Koskinen |
| author_sort | Antti P. Happonen |
| collection | DOAJ |
| description | We discuss data filtering prior to image reconstruction. For this kind of filtering, the radial direction of the sinogram is routinely employed. Recently, we have introduced an alternative approach to sinogram data processing, exploiting the angular information in a novel way. This new stackgram representation can be regarded as an intermediate form of the sinogram and image domains. In this experimental study, we compare the radial sinogram and angular stackgram filtering methods using physical SPECT phantoms. Our study is carried out by employing simple linear and nonlinear filters with ten different Gaussian kernels, in order to provide a comparable investigation. According to our results, angular stackgram filtering with the nonlinear filters provides the best resolution-noise tradeoff of the compared methods. Besides, stackgram filtering with these filters seems to preserve the resolution in an exceptional way. Visually, noise in the reconstructed images after stackgram filtering appears more “powdery” in comparison with radial sinogram filtering. |
| format | Article |
| id | doaj-art-b74e212c084649529177d89e64985b5d |
| institution | Kabale University |
| issn | 1687-4188 1687-4196 |
| language | English |
| publishDate | 2007-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Biomedical Imaging |
| spelling | doaj-art-b74e212c084649529177d89e64985b5d2025-02-03T01:29:00ZengWileyInternational Journal of Biomedical Imaging1687-41881687-41962007-01-01200710.1155/2007/3851638516Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear FiltersAntti P. Happonen0Matti O. Koskinen1Department of Clinical Physiology, Medical Imaging Center, Tampere University Hospital, P.O. Box 2000, Tampere 33521, FinlandDepartment of Clinical Physiology, Medical Imaging Center, Tampere University Hospital, P.O. Box 2000, Tampere 33521, FinlandWe discuss data filtering prior to image reconstruction. For this kind of filtering, the radial direction of the sinogram is routinely employed. Recently, we have introduced an alternative approach to sinogram data processing, exploiting the angular information in a novel way. This new stackgram representation can be regarded as an intermediate form of the sinogram and image domains. In this experimental study, we compare the radial sinogram and angular stackgram filtering methods using physical SPECT phantoms. Our study is carried out by employing simple linear and nonlinear filters with ten different Gaussian kernels, in order to provide a comparable investigation. According to our results, angular stackgram filtering with the nonlinear filters provides the best resolution-noise tradeoff of the compared methods. Besides, stackgram filtering with these filters seems to preserve the resolution in an exceptional way. Visually, noise in the reconstructed images after stackgram filtering appears more “powdery” in comparison with radial sinogram filtering.http://dx.doi.org/10.1155/2007/38516 |
| spellingShingle | Antti P. Happonen Matti O. Koskinen Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters International Journal of Biomedical Imaging |
| title | Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters |
| title_full | Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters |
| title_fullStr | Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters |
| title_full_unstemmed | Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters |
| title_short | Experimental Investigation of Angular Stackgram Filtering for Noise Reduction of SPECT Projection Data: Study with Linear and Nonlinear Filters |
| title_sort | experimental investigation of angular stackgram filtering for noise reduction of spect projection data study with linear and nonlinear filters |
| url | http://dx.doi.org/10.1155/2007/38516 |
| work_keys_str_mv | AT anttiphapponen experimentalinvestigationofangularstackgramfilteringfornoisereductionofspectprojectiondatastudywithlinearandnonlinearfilters AT mattiokoskinen experimentalinvestigationofangularstackgramfilteringfornoisereductionofspectprojectiondatastudywithlinearandnonlinearfilters |