By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Ultrasound Technology. According to news reporting originating in Rochester, Minnesota, by VerticalNews journalists, research stated, "Elasticity imaging is a medical imaging modality that measures tissue elasticity as an aid in the diagnosis of certain diseases. Shear wave-based methods have been developed to perform elasticity measurements in soft tissue."
The news reporters obtained a quote from the research from Mayo Clinic, "These methods often use the radiation force mechanism of focused ultrasound to induce shear waves in soft tissue such as liver, kidney, breast, thyroid and skeletal muscle. The efficiency of the ultrasound beam in producing broadband extended shear waves in soft tissue is very important to the widespread use of this modality. Hybrid beamforming combines two types of focusing, conventional spherical focusing and axicon focusing, to produce a beam for generating a shear wave that has increased depth-of-field (DOF) so that measurements can be made with a shear wave with a consistent wave front. Spherical focusing is used in many applications to achieve high lateral resolution, but has low DOF. Axicon focusing, with a cone-shaped transducer, can provide good lateral resolution with large DOF. We describe our linear aperture design and beam optimization performed using angular spectrum simulations. We performed a large parametric simulation study in which we varied the focal depth for the spherical focusing portion of the aperture, the numbers of elements devoted to the spherical and axicon focusing portions of the aperture and the opening angle used for axicon focusing. The hybrid beamforming method was experimentally tested in two phantoms, and shear wave speed measurement accuracy and DOF for each hybrid beam were evaluated. We compared our results with those for shear waves generated using only spherical focusing."
According to the news reporters, the research concluded: "The results of this study indicate that hybrid beamforming is capable of producing a beam with increased DOF over which accurate shear wave speed measurements can be made for different-size apertures and at different focal depths."
For more information on this research see: Optimized Shear Wave Generation Using Hybrid Beamforming Methods. Ultrasound in Medicine and Biology, 2014;40(1):188-199. Ultrasound in Medicine and Biology can be contacted at: Elsevier Science Inc, 360 Park Ave South, New York, NY 10010-1710, USA. (Elsevier - www.elsevier.com; Ultrasound in Medicine and Biology - www.elsevier.com/wps/product/cws_home/525490)
Our news correspondents report that additional information may be obtained by contacting A. Nabavizadeh, Mayo Clinic, Coll Med, Dept. of Physiol & Biomed Engn, Rochester, MN 55905, United States. Additional authors for this research include J.F. Greenleaf, M. Fatemi and M.W. Urban.
Keywords for this news article include: Rochester, Minnesota, United States, Ultrasound Technology, North and Central America
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