Influence of the Pixel Sizes of Reference Computed Tomography on Single-photon Emission Computed Tomography Image Reconstruction Using Conjugate-gradient Algorithm
| Autor: | Shota Sakimoto, Kyohei Okuda, Tomonobu Ida, Shigeru Moriyama, Susumu Fujii |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Tomography Emission-Computed Single-Photon Image fusion Tomographic reconstruction medicine.diagnostic_test business.industry Phantoms Imaging Industrial computed tomography General Medicine Iterative reconstruction Single-photon emission computed tomography Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics 030220 oncology & carcinogenesis medicine Image Processing Computer-Assisted business Emission computed tomography Algorithms Image-guided radiation therapy |
| Zdroj: | Nihon Hoshasen Gijutsu Gakkai zasshi. 73(10) |
| ISSN: | 0369-4305 |
| Popis: | Purpose The frame-of-reference using computed-tomography (CT) coordinate system on single-photon emission computed tomography (SPECT) reconstruction is one of the advanced characteristics of the xSPECT reconstruction system. The aim of this study was to reveal the influence of the high-resolution frame-of-reference on the xSPECT reconstruction. Methods 99mTc line-source phantom and National Electrical Manufacturers Association (NEMA) image quality phantom were scanned using the SPECT/CT system. xSPECT reconstructions were performed with the reference CT images in different sizes of the display field-of-view (DFOV) and pixel. Results The pixel sizes of the reconstructed xSPECT images were close to 2.4 mm, which is acquired as originally projection data, even if the reference CT resolution was varied. The full width at half maximum (FWHM) of the line-source, absolute recovery coefficient, and background variability of image quality phantom were independent on the sizes of DFOV in the reference CT images. Conclusion The results of this study revealed that the image quality of the reconstructed xSPECT images is not influenced by the resolution of frame-of-reference on SPECT reconstruction. |
| Databáze: | OpenAIRE |
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