Transient MR elastography (t-MRE) using ultrasound radiation force: Theory, safety, and initial experiments in vitro
✍ Scribed by Rémi Souchon; Rares Salomir; Olivier Beuf; Laurent Milot; Denis Grenier; Denis Lyonnet; Jean-Yves Chapelon; Olivier Rouvière
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 949 KB
- Volume
- 60
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
The purpose of our study was to assess the feasibility of using ultrasound radiation force as a safe vibration source for transient MR elastography (t‐MRE). We present a theoretical framework to predict the phase shift of the complex MRE signal, the temperature elevation due to ultrasound, and safety indicators (I~SPPA~, I~SPTA~, MI). Next, we report wave images acquired in porcine liver samples in vitro. MR thermometry was used to estimate the temperature elevation induced by ultrasound. Finally, we discuss the implications of our results with regard to the feasibility of using radiation force for t‐MRE in a clinical setting, and a specific echo‐planar imaging (EPI) MRE sequence is proposed. Magn Reson Med 60:871–881, 2008. © 2008 Wiley‐Liss, Inc.