Title :
Shear waves induced by moving needle in MR elastography
Author :
Chan, Q.C.C. ; Li, G. ; Ehman, R.L. ; Rossman, P.J. ; Cao, G. ; Li, R. ; Yang, E.S.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
Abstract :
Magnetic resonance elastography (MRE) is a phase contrast-based method for observing shear wave propagation in a material to determine its stiffness. The objective of this study was to determine whether shear waves suitable for MRE could be induced using a moving acupuncture needle. Tissue-simulating bovine gel phantom and a 0.4 mm diameter acupuncture needle were used in the experiment. The results showed that observable shear waves could be induced in the gel phantom by cyclic needle motion. The observed wavelength varied with excitation frequency, as expected. Generating shear waves using moving needles may be a useful tool to study the basic mechanism of acupuncture with MRE. Further study will be conducted to observe the wave motion in inhomogeneous media and acupuncture-induced effects in in-vivo studies.
Keywords :
biological tissues; biomechanics; biomedical MRI; biomedical equipment; biomedical materials; elasticity; image sequences; magnetoelastic waves; medical image processing; needles; phantoms; 0.4 mm; acupuncture needle; cyclic needle motion; imaging sequence; magnetic resonance elastography; phase contrast method; shear wave propagation; stiffness; tissue-simulating bovine gel phantom; Biomedical engineering; Bovine; Frequency measurement; Frequency synchronization; Imaging phantoms; In vivo; Magnetic resonance imaging; Muscles; Needles; Radiology; Acupuncture; MR Elastography; shear wave; stiffness;
Conference_Titel :
Engineering in Medicine and Biology Society, 2004. IEMBS '04. 26th Annual International Conference of the IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-8439-3
DOI :
10.1109/IEMBS.2004.1403336
