Choice of the regularization parameter for perfusion quantification with MRI.

Steven Sourbron, Robert Luypaert, Peter Van Schuerbeek, Martine Dujardin, Tadeusz Stadnik

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Truncated singular value decomposition (TSVD) is an effective method for the deconvolution of dynamic contrast enhanced (DCE) MRI. Two robust methods for the selection of the truncation threshold on a pixel-by-pixel basis--generalized cross validation (GCV) and the L-curve criterion (LCC)--were optimized and compared to paradigms in the literature. GCV and LCC were found to perform optimally when applied with a smooth version of TSVD, known as standard form Tikhonov regularization (SFTR). The methods lead to improvements in the estimate of the residue function and of its maximum, and converge properly with SNR. The oscillations typically observed in the solution vanish entirely, and perfusion is more accurately estimated at small mean transit times. This results in improved image contrast and increased sensitivity to perfusion abnormalities, at the cost of 1-2 min in calculation time and hyperintense clusters in the image. Preliminary experience with clinical data suggests that the latter problem can be resolved using spatial continuity and/or hybrid thresholding methods. In the simulations GCV and LCC are equivalent in terms of performance, but GCV thresholding is faster.
Original languageEnglish
Pages (from-to)3307-33024
Number of pages17
JournalPhysics in Medicine and Biology
Volume49
Publication statusPublished - 21 Jun 2004

Keywords

  • MRI
  • Perfusion
  • Deconvolution

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