A correction method of the spatial distortion in planar images from γ-Camera systems

被引：9
|
作者：
Thanasas, D. [1 ]
Georgiou, E. [2 ]
Giokaris, N. [1 ,3 ]
Karabarbounis, A. [1 ,3 ]
Maintas, D. [4 ]
Papanicolas, C. N. [1 ,3 ]
Polychronopoulou, A. [1 ]
Stiliaris, E. [1 ,3 ]
机构：
[1] Univ Athens, Dept Phys, GR-15771 Athens, Greece
[2] Univ Athens, Sch Med, Med Phys Lab, GR-15771 Athens, Greece
[3] Inst Accelerating Syst & Applicat, Athens 10024, Greece
[4] Med Ctr Athens, Inst Isotop Studies, Athens 15125, Greece
来源：
JOURNAL OF INSTRUMENTATION | 2009年 / 4卷
关键词：
Gamma camera; SPECT; PET PET/CT; coronary CT angiography (CTA); Medical-image reconstruction methods and algorithms; computer-; aided so; NONUNIFORMITY;
D O I：
10.1088/1748-0221/4/06/P06012
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A methodology for correcting spatial distortions in planar images for small Field Of View (FOV) gamma-Camera systems based on Position Sensitive Photomultiplier Tubes (PSPMT) and pixelated scintillation crystals is described. The process utilizes a correction matrix whose elements are derived from a prototyped planar image obtained through irradiation of the scintillation crystal by a Co-60 point source and without a collimator. The method was applied to several planar images of a SPECT experiment with a simple phantom construction at different detection angles. The tomographic images are obtained using the Maximum-Likelihood Expectation-Maximization (MLEM) reconstruction technique. Corrected and uncorrected images are compared and the applied correction methodology is discussed.
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页数：7
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