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Annals of Nuclear Medicine

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21.03.2018 | Original Article

Implementation of GPU accelerated SPECT reconstruction with Monte Carlo-based scatter correction

verfasst von: Tobias Bexelius, Antti Sohlberg

Erschienen in: Annals of Nuclear Medicine | Ausgabe 5/2018

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Abstract

Objective

Statistical SPECT reconstruction can be very time-consuming especially when compensations for collimator and detector response, attenuation, and scatter are included in the reconstruction. This work proposes an accelerated SPECT reconstruction algorithm based on graphics processing unit (GPU) processing.

Methods

Ordered subset expectation maximization (OSEM) algorithm with CT-based attenuation modelling, depth-dependent Gaussian convolution-based collimator-detector response modelling, and Monte Carlo-based scatter compensation was implemented using OpenCL. The OpenCL implementation was compared against the existing multi-threaded OSEM implementation running on a central processing unit (CPU) in terms of scatter-to-primary ratios, standardized uptake values (SUVs), and processing speed using mathematical phantoms and clinical multi-bed bone SPECT/CT studies.

Results

The difference in scatter-to-primary ratios, visual appearance, and SUVs between GPU and CPU implementations was minor. On the other hand, at its best, the GPU implementation was noticed to be 24 times faster than the multi-threaded CPU version on a normal 128 × 128 matrix size 3 bed bone SPECT/CT data set when compensations for collimator and detector response, attenuation, and scatter were included.

Conclusions

GPU SPECT reconstructions show great promise as an every day clinical reconstruction tool.

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Titel: Implementation of GPU accelerated SPECT reconstruction with Monte Carlo-based scatter correction
verfasst von: Tobias Bexelius
Antti Sohlberg
Publikationsdatum: 21.03.2018
Verlag: Springer Japan
Erschienen in: Annals of Nuclear Medicine / Ausgabe 5/2018
Print ISSN: 0914-7187
Elektronische ISSN: 1864-6433
DOI: https://doi.org/10.1007/s12149-018-1252-1

Springer Medizin

Abstract

Objective

Methods

Results

Conclusions

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