NDLI: A phantom study to cross-validate multimodality shear wave elastography techniques

Content Provider	IEEE Xplore Digital Library
Author	Hua Xie Shamdasani, V. Heng Zhao Pengfei Song Shiwei Zhou Robert, J.-L. Greenleaf, J. Shigao Chen
Copyright Year	2012
Description	Author affiliation: Philips Healthcare, Bothell, WA, USA (Shamdasani, V.) \|\| Dept. of Physiol. & Biomed. Eng., Mayo Clinic Coll. of Med., Rochester, MN, USA (Heng Zhao; Pengfei Song; Greenleaf, J.; Shigao Chen) \|\| Philips Res. North America, Briarcliff Manor, NY, USA (Hua Xie; Shiwei Zhou; Robert, J.-L.)
Abstract	As various quantitative shear wave elastography techniques are being implemented commercially and used clinically, it is important to understand what elastic modulus is measured by those techniques and to assess technical factors influencing measurement accuracy. Cross-validated in this study were four shear wave elastography techniques including ultrasound elastography point quantification (ElastPQ), magnetic resonance elastography (MRE), 1-D transient elastography (TE), and a Verasonics ultrasound system based elastography feature. ElastPQ is an acoustic radiation force (ARF) based technique implemented on an ultrasound system iU22 for a curvilinear probe C5-1. MRE measurements were made at a shear wave frequency of 100 Hz. The 1-D TE system uses an external mechanical vibrator at 100 Hz to generate shear waves and a 7.5 MHz single element transducer to track shear wave propagation. The Verasonics ultrasound system with a linear probe L7-4 uses a plane wave transmit imaging mode to measure propagation speed of shear waves induced by ARF. Six custom-made elasticity phantoms were measured selectively and were assumed purely elastic by the four techniques. The results show good agreement between two ARF based techniques: ElastPQ and Verasonics based feature. When comparing ElastPQ to 1-D TE, the discrepancy for the hardest phantom could be explained by the diffraction artifact in the latter system. Further improvements on the 1D-TE reconstruction algorithm are ongoing. The overestimation by ElastPQ and Verasonics against MRE could be attributed to frequency dispersion due to slight viscosity in phantoms. MRE measures shear wave speed at a single frequency 100 Hz, whereas the other two estimate an effective group velocity over a larger bandwidth for a broadband shear wave signal. 1-D TE and MRE measurements are in closest agreement due to similar shear wave frequencies. More validation of these techniques is required on real patients in clinical settings.
Starting Page	1858
Ending Page	1861
File Size	1526990
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0466
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phantoms Ultrasonic imaging Ultrasonic variables measurement Acoustics Frequency measurement Acoustic measurements shear wave dispersion ultrasound shear wave elastography magnetic resonance elastography shear modulus shear viscosity
Content Type	Text
Resource Type	Article

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