紀要論文

デコンボリューション法による静止型マルチピンホールＳＰＥＣＴの空間分解能改善

IMPROVEMENT OF THE SPATIAL RESOLUTION WITH A DECONVOLUTION METHOD FOR A MULTI-PINHOLE SPECT SYSTEM

jpn

24368083

https://doi.org/10.15002/00025372

法政大学大学院理工学研究科

法政大学大学院紀要. 理工学研究科編

63

1

5

2022-03-24

Version of Record

We propose a method to improve the spatial resolution of an image for a static multi-pinhole SPECT system. This system has a advantage of measuring dynamic function of organs, which could not be performed by conventional systems. However, the image quality is sensitive to the pinhole size of a collimator. Especially, in the case of a large pinhole, the widely applied 7-rays method could not sufficiently correct the image resolution. Therefore, we propose a point spread function (PSF) deconvolution method for a multi-pinhole SPECT system. In this paper, we assumed a shift-variant PSF at each pixel of the detector, and performs PSF deconvolution on projection data. The feasibility of this method was investigated with a simulation. Projection data were obtained by a Monte Carlo method. The reconstruction images with our proposed method had significantly higher spatial resolution and reproduced more detail structures compared with those of the 7-rays method. This results indicated the effectiveness of our proposed method.

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