Iterative list mode reconstruction for coincidence data of gamma camera

Stefaan Vandenberghe; Yves D'Asseler; Michel Koole; Luc Bouwens; Rik Van de Walle; Ignace L. Lemahieu; Rudi A. Dierckx

doi:10.1117/12.387667

6 June 2000 Iterative list mode reconstruction for coincidence data of gamma camera

Stefaan Vandenberghe, Yves D'Asseler, Michel Koole, Luc Bouwens, Rik Van de Walle, Ignace L. Lemahieu, Rudi A. Dierckx

Proceedings Volume 3979, Medical Imaging 2000: Image Processing; (2000) https://doi.org/10.1117/12.387667
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

The 3D acquisition data from positron coincidence detection on a gamma camera, can be stored in list-mode or histogram format. The standard processing of the list mode-data is Single Slice Rebinning (with a maximum acceptance angle) to 2D histogrammed projections followed by Ordered Subsets Expectation Maximization reconstruction. This method has several disadvantages: sampling accuracy is lost by histogramming events, axial resolution degrades with increasing distance from the center of rotation and useful events, with angle bigger than the acceptance angle, are not included in the reconstruction. Therefore an iterative reconstruction algorithm, operating directly on list-mode data, has been implemented. The 2D and 3D version of this iterative list-mode algorithm have been compared with the aforementioned standard reconstruction method. A higher number of events is used in the reconstruction, which results in a lower standard deviation. Resolution is fairly constant over the Field of View. The use of a fast projector and backprojector reduces the reconstruction time to clinical acceptable times.

Citation Download Citation

Stefaan Vandenberghe, Yves D'Asseler, Michel Koole, Luc Bouwens, Rik Van de Walle, Ignace L. Lemahieu, and Rudi A. Dierckx "Iterative list mode reconstruction for coincidence data of gamma camera", Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000); https://doi.org/10.1117/12.387667

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