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Research ArticleImaging

Continuous Bed Motion in a Silicon Photomultiplier–Based Scanner Provides Equivalent Spatial Resolution and Image Quality in Whole-Body PET Images at Similar Acquisition Times Using the Step-and-Shoot Method

Kodai Kumamoto, Hideaki Sato, Yuji Tsutsui, Shinichi Awamoto, Yasuo Yamashita, Shingo Baba and Masayuki Sasaki
Journal of Nuclear Medicine Technology December 2022, 50 (4) 335-341; DOI: https://doi.org/10.2967/jnmt.121.263240
Kodai Kumamoto
1Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan;
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Hideaki Sato
1Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan;
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Yuji Tsutsui
2Department of Radiological Science, Faculty of Health Science, Junshin Gakuen University, Fukuoka, Japan;
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Shinichi Awamoto
3Division of Radiological Technology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan;
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Yasuo Yamashita
3Division of Radiological Technology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan;
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Shingo Baba
4Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and
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Masayuki Sasaki
5Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
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Abstract

This study investigated the spatial resolution and image quality of the continuous-bed-motion (CBM) method in a sensitive silicon photomultiplier–based PET/CT system compared with the traditional step-and-shoot (SS) method. Methods: A PET/CT scanner was used in this study. Data acquisition using the SS method was performed for 3 min per bed position. In the CBM method, the bed speed ranged from 0.5 to 3.3 mm/s. The acquisition time equivalent to the SS method was 1.1 mm/s for 2-bed-position ranges and 0.8 mm/s for 7-bed-position ranges. The spatial resolution was investigated using 18F point sources and evaluated using the full width at half maximum. Image quality was investigated using a National Electrical Manufacturers Association International Electrotechnical Commission body phantom with 6 spheres 10, 13, 17, 22, 28, and 37 mm in inner diameter. The radioactivity concentration ratio of the 18F solution in all spheres and the background was approximately 4:1. The detectability of each sphere was visually evaluated using a 5-step score. Image quality was physically evaluated using the noise-equivalent count rate, contrast percentage of the 10-mm hot sphere, background variability percentage, and contrast-to-noise ratio. Results: The spatial resolution was not affected by the difference in acquisition methods or bed speeds. The detectability of the 10-mm sphere with a bed speed of 2.2 mm/s or faster was significantly inferior to that of the SS 2-bed-position method. In evaluating image quality, we observed no significant difference in contrast percentage among the acquisition methods or speeds in the CBM method. However, the increasing bed speed in the CBM method increased the background variability percentage and decreased the noise-equivalent count rate. When comparing the SS 2-bed-position method with the CBM method at 0.8 mm/s, we observed no significant differences in any parameters. Conclusion: In whole-body PET images obtained with a silicon photomultiplier–based PET/CT scanner, the CBM method provides spatial resolution and image quality equivalent to the SS method, with the same acquisition time.

  • continuous bed motion
  • step-and-shoot
  • SiPM
  • spatial resolution
  • image quality

Footnotes

  • Published online Apr. 19, 2022.

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Journal of Nuclear Medicine Technology: 50 (4)
Journal of Nuclear Medicine Technology
Vol. 50, Issue 4
December 1, 2022
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Continuous Bed Motion in a Silicon Photomultiplier–Based Scanner Provides Equivalent Spatial Resolution and Image Quality in Whole-Body PET Images at Similar Acquisition Times Using the Step-and-Shoot Method
Kodai Kumamoto, Hideaki Sato, Yuji Tsutsui, Shinichi Awamoto, Yasuo Yamashita, Shingo Baba, Masayuki Sasaki
Journal of Nuclear Medicine Technology Dec 2022, 50 (4) 335-341; DOI: 10.2967/jnmt.121.263240

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Continuous Bed Motion in a Silicon Photomultiplier–Based Scanner Provides Equivalent Spatial Resolution and Image Quality in Whole-Body PET Images at Similar Acquisition Times Using the Step-and-Shoot Method
Kodai Kumamoto, Hideaki Sato, Yuji Tsutsui, Shinichi Awamoto, Yasuo Yamashita, Shingo Baba, Masayuki Sasaki
Journal of Nuclear Medicine Technology Dec 2022, 50 (4) 335-341; DOI: 10.2967/jnmt.121.263240
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Keywords

  • continuous bed motion
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  • SiPM
  • spatial resolution
  • image quality
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