Volume 2 Supplement 1

Proceedings of the 4th PSMR Conference on PET/MR and SPECT/MR

Open Access

Dynamic brain PET/MR using TOF reconstruction

  • Mohammad Mehdi Khalighi1,
  • Gaspar Delso2,
  • Michel Tohme1,
  • Andrei Iagaru3 and
  • Greg Zaharchuk1
EJNMMI Physics20152(Suppl 1):A60


Published: 18 May 2015

In a functional PET/MR study, it is difficult to get good temporal resolution of activity distribution from PET images because of the need to image for a certain length of time to get sufficient count statistics (image SNR). Time-of-flight (TOF) reconstruction can be used to increase PET images SNR and therefore increase the temporal resolution. Five patients were injected with 410±80 MBq of FDG and scanned 140±30 minutes post-injection on a simultaneous TOF-enabled PET/MR scanner. PET images were reconstructed with and without TOF. TOF reconstruction shows faster convergence while it achieves a temporal SNR improvement of 5-45% (25±5%) compared to non-TOF reconstruction. With this additional SNR gain, frame durations as short as 30s are possible while preserving reasonable image quality. This in turn effectively increases the temporal resolution of dynamic brain studies using simultaneous PET/MR imaging.

Authors’ Affiliations

GE Healthcare
UniversitätsSpital Zürich
Stanford University


© Khalighi et al; licensee Springer. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.