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Iterative reconstruction of SiPM light response functions in a square-shaped compact gamma camera.

Abstract：

:Compact gamma cameras with a square-shaped monolithic scintillator crystal and an array of silicon photomultipliers (SiPMs) are actively being developed for applications in areas such as small animal imaging, cancer diagnostics and radiotracer guided surgery. Statistical methods of position reconstruction, which are potentially superior to the traditional centroid method, require accurate knowledge of the spatial response of each photomultiplier. Using both Monte Carlo simulations and experimental data obtained with a camera prototype, we show that the spatial response of all photomultipliers (light response functions) can be parameterized with axially symmetric functions obtained iteratively from flood field irradiation data. The study was performed with a camera prototype equipped with a 30  ×  30  ×  2 mm3 LYSO crystal and an 8  ×  8 array of SiPMs for 140 keV gamma rays. The simulations demonstrate that the images, reconstructed with the maximum likelihood method using the response obtained with the iterative approach, exhibit only minor distortions: the average difference between the reconstructed and the true positions in X and Y directions does not exceed 0.2 mm in the central area of 22  ×  22 mm2 and 0.4 mm at the periphery of the camera. A similar level of image distortions is shown experimentally with the camera prototype.

journal_name

Phys Med Biol

journal_title

Physics in medicine and biology

authors

Morozov A,Alves F,Marcos J,Martins R,Pereira L,Solovov V,Chepel V

doi

10.1088/1361-6560/aa6029

subject

Has Abstract

pub_date

2017-05-07 00:00:00

pages

3619-3638

issue

9

eissn

0031-9155

issn

1361-6560

journal_volume

62

pub_type

杂志文章

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