Performance characteristics of a novel clustered multi-pinhole technology for simultaneous high-resolution SPECT/PET

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• 作者：Kenta Miwa ; Masayuki Inubushi ; Yasuto Takeuchi…
• 关键词：VECTor ; Simultaneous imaging ; Clustered multi ; pinhole ; Small ; animal imaging ; SPECT/PET
• 刊名：Annals of Nuclear Medicine
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：29
• 期：5
• 页码：460-466
• 全文大小：821 KB
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• 作者单位：Kenta Miwa (1) (2) (3)
  Masayuki Inubushi (4)
  Yasuto Takeuchi (1)
  Tetsuro Katafuchi (5)
  Mitsuru Koizumi (1) (2)
  Tsuneo Saga (1)
  Masayuki Sasaki (3)
  
  1. Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-shi, Chiba, 263-8555, Japan
  2. Department of Nuclear Medicine, Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan
  3. Division of Medical Quantum Science, Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
  4. Division of Nuclear Medicine, Department of Radiology, Kawasaki Medical School, 577 Matsushima Kurashiki, Okayama, 701-0192, Japan
  5. Department of Radiological Technology, Gifu University of Medical Science, 795-1 Nagamine, Ichihiraga, Seki-shi, Gifu, 501-3892, Japan
  
• 刊物主题：Nuclear Medicine; Imaging / Radiology;
• 出版者：Springer Japan
• ISSN：1864-6433

文摘

Objective Versatile emission computed tomography (VECTor) for small-animal imaging enables fully simultaneous SPECT/PET image acquisition based on clustered multi-pinhole collimation. The present study experimentally evaluated the detailed performance characteristics of the clustered multi-pinhole system for simultaneous 99mTc and 18F imaging from the user perspective. Methods Spatial resolution, sensitivity, count rate linearity were determined for the VECTor system (MILabs). Two hot-rod micro-resolution phantoms with 6 sectors were created to test the resolution of 99mTc and 18F. Sensitivity and count rate linearity were measured by scanning 99mTc and 18F point sources positioned at the center of the field of view. Furthermore, we quantified the influence of 18F on 99mTc SPECT images. The ratios of SPECT counts on the 99mTc-only and simultaneous 18F-99mTc at various time points were evaluated as a function of the 18F-to-99mTc activity concentration ratio. Results The 0.5-mm hot-rods can be visually distinguished in the 99mTc image, and 0.8-mm rods for 18F remained clearly visible. The point-source sensitivity was 2800?cps/MBq for 99mTc and 2899?cps/MBq for 18F, respectively. Count rates up to 120,000?cps for one bed position were linear for the activity. Spill-over from 18F into 99mTc SPECT images was negligible when the activity concentration of the administered 18F solution exceeded that of the 99mTc solution by up to a factor of 2. Conclusions We evaluated the performance characteristics of the VECTor that lead to determination of the optimal administered doses of 99mTc and 18F tracers. We found that the VECTor achieved high resolution and high sensitivity as well as good 99mTc and 18F linearity. Simultaneous SPECT/PET imaging with 99mTc and 18F tracers, and stand-alone 99mTc and 18F imaging using clustered-pinhole collimators is feasible and practical for a wide range of research applications using small animals.