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Published in: European Radiology 5/2019

01-05-2019 | Neuro

Wavelet-based reconstruction of dynamic susceptibility MR-perfusion: a new method to visualize hypervascular brain tumors

Authors: Thomas Huber, Lukas Rotkopf, Benedikt Wiestler, Wolfgang G. Kunz, Stefanie Bette, Jens Gempt, Christine Preibisch, Jens Ricke, Claus Zimmer, Jan S. Kirschke, Wieland H. Sommer, Kolja M. Thierfelder

Published in: European Radiology | Issue 5/2019

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Abstract

Objectives

Parameter maps based on wavelet-transform post-processing of dynamic perfusion data offer an innovative way of visualizing blood vessels in a fully automated, user-independent way. The aims of this study were (i) a proof of concept regarding wavelet-based analysis of dynamic susceptibility contrast (DSC) MRI data and (ii) to demonstrate advantages of wavelet-based measures compared to standard cerebral blood volume (CBV) maps in patients with the initial diagnosis of glioblastoma (GBM).

Methods

Consecutive 3-T DSC MRI datasets of 46 subjects with GBM (mean age 63.0 ± 13.1 years, 28 m) were retrospectively included in this feasibility study. Vessel-specific wavelet magnetic resonance perfusion (wavelet-MRP) maps were calculated using the wavelet transform (Paul wavelet, order 1) of each voxel time course. Five different aspects of image quality and tumor delineation were each qualitatively rated on a 5-point Likert scale. Quantitative analysis included image contrast and contrast-to-noise ratio.

Results

Vessel-specific wavelet-MRP maps could be calculated within a mean time of 2:27 min. Wavelet-MRP achieved higher scores compared to CBV in all qualitative ratings: tumor depiction (4.02 vs. 2.33), contrast enhancement (3.93 vs. 2.23), central necrosis (3.86 vs. 2.40), morphologic correlation (3.87 vs. 2.24), and overall impression (4.00 vs. 2.41); all p < .001. Quantitative image analysis showed a better image contrast and higher contrast-to-noise ratios for wavelet-MRP compared to conventional perfusion maps (all p < .001).

Conclusions

wavelet-MRP is a fast and fully automated post-processing technique that yields reproducible perfusion maps with a clearer vascular depiction of GBM compared to standard CBV maps.

Key Points

Wavelet-MRP offers high-contrast perfusion maps with a clear delineation of focal perfusion alterations.
• Both image contrast and visual image quality were beneficial for wavelet-MRP compared to standard perfusion maps like CBV.
• Wavelet-MRP can be automatically calculated from existing dynamic susceptibility contrast (DSC) perfusion data.
Appendix
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Literature
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Metadata
Title
Wavelet-based reconstruction of dynamic susceptibility MR-perfusion: a new method to visualize hypervascular brain tumors
Authors
Thomas Huber
Lukas Rotkopf
Benedikt Wiestler
Wolfgang G. Kunz
Stefanie Bette
Jens Gempt
Christine Preibisch
Jens Ricke
Claus Zimmer
Jan S. Kirschke
Wieland H. Sommer
Kolja M. Thierfelder
Publication date
01-05-2019
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 5/2019
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-018-5892-2

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