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Iranian Journal of Medical Physics، جلد ۱۵، شماره Special Issue-۱۲th. Iranian Congress of Medical Physics، صفحات ۲۶۹-۲۶۹
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عنوان انگلیسی Conventional Voxel in Tomographic Reconstruction Based upon Plane-Integral Projections – Use It or Lose It?
چکیده انگلیسی مقاله Introduction: While the necessity of replacing voxels with blobs in conventional tomographic reconstruction based upon line-integrals is clear, it is not however well-investigated in plane- integral-based reconstruction. The problem is more challenging in convergent-plane projection reconstruction. In this work, we are aiming at utilizing blobs as alternative to voxels. Materials and Methods: To doing so, a spinning slithole collimated small-animal SPECT scanner was modeled within GATE simulator and SPECT data acquisition was performed for NEMA IQ phantom. The slithole provides convergent-plane-integral projections of the object being imaged. The collimation data were then reconstructed using an ad hoc 3D OSEM algorithm based upon plane-integral projections using cubic voxels. The image reconstruction was repeated for blobs. Various figures of merit were assessed in order to compare voxel and blob reconstructions. Results: Both voxel and blob reconstruction algorithms were verified using a noisy 3D Shepp- Logan phantom prior to reconstructing the simulation data, with an error of 6% and 9%, respectively. Blob modeling leads to a lower computation burden by a factor of ~2.1 in on- the-fly calculation of the system matrix. A 13% increase in SNR of the hottest rod of the NEMA IQ phantom is obtained when voxels are replaced by blobs. Blob reconstruction shows an advantage over voxel reconstruction by offering a monotonically decreasing NSE across all iterations indicating a more robust statistical noise handling. Conclusion: Voxels are simple and easy-to-implement, but blobs outperforms them by exhibiting a much more efficient projector/backprojector pair due to their inherent symmetric and smooth shape. Therefore, blobs should be the basis functions of choice in the case of plane-integral-based reconstruction.
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نویسندگان مقاله | Hojjat Mahani
Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.


| Gholamreza Raisali
Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.


| Alireza Kamali-Asl
Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran.


| Mohammad Reza Ay
Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran. Research Center for Molecular and Cellular Imaging, Tehran University of Medical Sciences, Tehran, Iran.
نشانی اینترنتی http://ijmp.mums.ac.ir/article_12913.html
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Conference Proceedings
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