title: Concurrent Visualization of Acoustic Radiation Force Displacement and Shear Wave Propagation with 7T MRI.
abstract: Manual palpation is a common and very informative diagnostic tool based on estimation of changes in the stiffness of tissues that result from pathology. In the case of a small lesion or a lesion that is located deep within the body, it is difficult for changes in mechanical properties of tissue to be detected or evaluated via palpation. Furthermore, palpation is non-quantitative and cannot be used to localize the lesion. Magnetic Resonance-guided Focused Ultrasound (MRgFUS) can also be used to evaluate the properties of biological tissues non-invasively. In this study, an MRgFUS system combines high field (7T) MR and 3 MHz focused ultrasound to provide high resolution MR imaging and a small ultrasonic interrogation region (~0.5 x 0.5 x 2 mm), as compared with current clinical systems. MR-Acoustic Radiation Force Imaging (MR-ARFI) provides a reliable and efficient method for beam localization by detecting micron-scale displacements induced by ultrasound mechanical forces. The first aim of this study is to develop a sequence that can concurrently quantify acoustic radiation force displacements and image the resulting transient shear wave. Our motivation in combining these two measurements is to develop a technique that can rapidly provide both ARFI and shear wave velocity estimation data, making it suitable for use in interventional radiology. Secondly, we validate this sequence in vivo by estimating the displacement before and after high intensity focused ultrasound (HIFU) ablation, and we validate the shear wave velocity in vitro using tissue-mimicking gelatin and tofu phantoms. Such rapid acquisitions are especially useful in interventional radiology applications where minimizing scan time is highly desirable.
authors.affiliation: Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, United States of America.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, United States of America.
authors.forename: Brett Z
authors.initials: BZ
authors.lastname: Fite
authors.affiliation: Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, United States of America.
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Mahakian
authors.affiliation: Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, United States of America.
authors.forename: Sarah M
authors.initials: SM
authors.lastname: Johnson
authors.affiliation: UNité d'Imagerie par Résonance Magnétique et Spectroscopie, NeuroSpin, CEA, Gif Sur Yvette, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Larrat
authors.affiliation: Image Guided Therapy, Pessac, France.
authors.forename: Erik
authors.initials: E
authors.lastname: Dumont
authors.affiliation: Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, United States of America.
authors.forename: Katherine W
authors.initials: KW
authors.lastname: Ferrara
mesh_terms: D000818:Animals; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D057086:High-Intensity Focused Ultrasound Ablation / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D051379:Mice; D008962:Models, Theoretical; D010173:Palpation