GPU-accelerated Monte Carlo based scatter correction in brain PET/MR

Michaela Gaens, Julien Bert, Uwe Pietrzyk, N. Jon Shah, Dimitris Visvikis

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)

Abstract

A main advantage of PET is that it can provide truly quantitative results. In order to achieve this goal an accurate scatter correction is essential. Despite some drawbacks, the currently used single scatter simulation approach is clinically applicable, whereas Monte Carlo (MC) simulations have been shown to provide accurate results, but are still too slow to be used routinely. In this work, the high computing capabilities of graphical processing units (GPUs) are exploited to accelerate PET MC simulations in order to facilitate their use in clinical practice. Starting from voxelized images, the annihilation photons are tracked through to their detection in the simulated PET scanner geometry, while retaining the information on their associated scattering interactions. The scatter distribution provided by the simulation can subsequently be used to correct the measured datasets. The new GPU implementation was validated by comparison with GATE simulation results and found to provide equivalent accuracy. The acceleration factor on the GPU compared to current GATE simulations was 135 for a voxelized brain phantom study. The speedup of MC simulations provided by the graphics processors represents a major step towards a clinically feasible and physically accurate scatter correction.

Original languageEnglish
Title of host publication2013 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages3
ISBN (Print)9781479905348
DOIs
Publication statusPublished - 2013
Externally publishedYes
EventIEEE Nuclear Science Symposium and Medical Imaging Conference 2013 - Seoul, Korea, Republic of (South)
Duration: 27 Oct 20132 Nov 2013
Conference number: 60th

Conference

ConferenceIEEE Nuclear Science Symposium and Medical Imaging Conference 2013
Abbreviated titleNSS/MIC 2013
Country/TerritoryKorea, Republic of (South)
CitySeoul
Period27/10/132/11/13

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