Simulation study on a stationary data acquisition SPECT system with multi-pinhole collimators attached to a triple-head gamma camera system

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• 作者：Koichi Ogawa (1)
  Yuta Ichimura (1)
  
• 关键词：Multi ; detector ; SPECT ; Multi ; pinhole collimator ; Stationary data acquisition
• 刊名：Annals of Nuclear Medicine
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：28
• 期：8
• 页码：716-724
• 全文大小：1,632 KB
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• 作者单位：Koichi Ogawa (1)
  Yuta Ichimura (1)
  
  1. Department of Applied Informatics, Faculty of Science and Engineering, Hosei University, 3-7-2 Kajinocho, Koganei, Tokyo, 184-8584, Japan
  
• ISSN：1864-6433

文摘

Objectives The aim of the study was to develop a new SPECT system that makes it possible to acquire projection data stationary using a triple-head gamma camera system. Methods We evaluated several data acquisition geometry with multi-pinhole collimators attached to a triple-head gamma camera system. The number of pinholes for each camera was three to twelve, and we located these holes on collimator plates adequately. These collimator holes were tilted by predefined angles to efficiently cover the field of view of the data acquisition system. Acquired data were reconstructed with the OS-EM method. In the simulations, we used a three-dimensional point source phantom, brain phantom, and myocardial phantom. Attenuation correction was conducted with the x-ray CT image of the corresponding slice. Results Reconstructed images of the point source phantom showed that the spatial resolution could be improved with the small number of pinholes. On the other hand, reconstructed images of the brain phantom showed that the large number of pinholes yielded images with less artifact. The results of the simulations with the myocardial phantom showed that more than eight pinholes could yield an accurate distribution of activity when the source was distributed only in the myocardium. Conclusions The results of the simulations confirmed that more than eight pinholes for each detector were required to reconstruct an artifact free image in the triple-head SPECT system for imaging of brain and myocardium.