Combined Deadtime and Pile-up correction for the MR-compatible BrainPET Scanner

Scanners in PET (Positron Emission Tomography) suffer from deadtime, i.e. the effect of sensitivity reduction with increasing count rates [1]. The reduction may be significant and its correction is a prerequisite for quantitative PET imaging. Conducting phantom studies with the Siemens 3T MR-BrainPE...

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Bibliographic Details
Main Authors: Weirich, Christoph, Scheins, Jurgen, Gaens, Michaela, Herzog, Hans, Shah, N. Jon
Format: Conference Proceeding
Language:English
Subjects:
Computational fluid dynamics
Crystals
Detectors
Image reconstruction
Phantoms
Positron emission tomography
Sensitivity
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Summary:Scanners in PET (Positron Emission Tomography) suffer from deadtime, i.e. the effect of sensitivity reduction with increasing count rates [1]. The reduction may be significant and its correction is a prerequisite for quantitative PET imaging. Conducting phantom studies with the Siemens 3T MR-BrainPET [2] it has been observed that deadtime is not a globally homogeneous effect but detector block dependent. Furthermore, a minor shift of crystal efficiencies on the same block due to pulse pile-up has been identified as a further component of this dynamic effect. This requires the treatment of deadtime on block and crystal level. Here, a block level deadtime correction combined with a pile-up correction is presented, implemented and assessed. The method is compared to the global deadtime correction method, as is standard in most commercial PET scanners.
ISSN:1082-3654
2577-0829
DOI:10.1109/NSSMIC.2013.6829401