Multi-voxel algorithm for quantitative bi-exponential MRI T1 estimation

P. Bladt, G. Van Steenkiste, G. Ramos-Llordén, A. J. Den Dekker, J. Sijbers

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Abstract

Quantification of the spin-lattice relaxation time, T1, of tissues is important for characterization of tissues in clinical magnetic resonance imaging (MRI). In T1 mapping, T1 values are estimated from a set of T1-weighted MRI images. Due to the limited spatial resolution of the T1-weighted images, one voxel might consist of two tissues, causing partial volume effects (PVE). In conventional mono-exponential T1 estimation, these PVE result in systematic errors in the T1 map. To account for PVE, single-voxel bi-exponential estimators have been suggested. Unfortunately, in general, they suffer from low accuracy and precision. In this work, we propose a joint multi-voxel bi-exponential T1 estimator (JMBE) and compare its performance to a single-voxel bi-exponential T1 estimator (SBE). Results show that, in contrast to the SBE, and for clinically achievable single-voxel SNRs, the JMBE is accurate and efficient if four or more neighboring voxels are used in the joint estimation framework. This illustrates that, for clinically realistic SNRs, accurate results for quantitative biexponential T1 estimation are only achievable if information of neighboring voxels is incorporated.

Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationMedical Imaging 2016: Image Processing
EditorsMartin A. Styner, Elsa D. Angelini
Place of PublicationBellingham, WA, USA
PublisherSPIE
Number of pages14
Volume9784
ISBN (Electronic)978-1-510600195
DOIs
Publication statusPublished - 2016
EventMedical Imaging 2016: Image Processing - San Diego, United States
Duration: 1 Mar 20163 Mar 2016

Publication series

NameProceedings of SPIE
Volume9784
ISSN (Electronic)1605-7422

Conference

ConferenceMedical Imaging 2016: Image Processing
CountryUnited States
CitySan Diego
Period1/03/163/03/16

Keywords

  • Maximum likelihood estimation
  • Partial volume effects
  • Quantitative MRI
  • T1 relaxometry

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    Bladt, P., Van Steenkiste, G., Ramos-Llordén, G., Den Dekker, A. J., & Sijbers, J. (2016). Multi-voxel algorithm for quantitative bi-exponential MRI T1 estimation. In M. A. Styner, & E. D. Angelini (Eds.), Proceedings of SPIE: Medical Imaging 2016: Image Processing (Vol. 9784). [978402] (Proceedings of SPIE; Vol. 9784). SPIE. https://doi.org/10.1117/12.2216831