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Proceedings Paper

Investigation of an acoustical holography system for real-time imaging
Author(s): Barbara A. Fecht; Michael P. Andre; George F. Garlick; Ronald L. Shelby; Jerod O. Shelby; Constance D. Lehman
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Paper Abstract

A new prototype imaging system based on ultrasound transmission through the object of interest -- acoustical holography -- was developed which incorporates significant improvements in acoustical and optical design. This system is being evaluated for potential clinical application in the musculoskeletal system, interventional radiology, pediatrics, monitoring of tumor ablation, vascular imaging and breast imaging. System limiting resolution was estimated using a line-pair target with decreasing line thickness and equal separation. For a swept frequency beam from 2.6 - 3.0 MHz, the minimum resolution was 0.5 lp/mm. Apatite crystals were suspended in castor oil to approximate breast microcalcifications. Crystals from 0.425 - 1.18 mm in diameter were well resolved in the acoustic zoom mode. Needle visibility was examined with both a 14-gauge biopsy needle and a 0.6 mm needle. The needle tip was clearly visible throughout the dynamic imaging sequence as it was slowly inserted into a RMI tissue-equivalent breast biopsy phantom. A selection of human images was acquired in several volunteers: a 25 year-old female volunteer with normal breast tissue, a lateral view of the elbow joint showing muscle fascia and tendon insertions, and the superficial vessels in the forearm. Real-time video images of these studies will be presented. In all of these studies, conventional sonography was used for comparison. These preliminary investigations with the new prototype acoustical holography system showed favorable results in comparison to state-of-the-art pulse-echo ultrasound and demonstrate it to be suitable for further clinical study. The new patient interfaces will facilitate orthopedic soft tissue evaluation, study of superficial vascular structures and potentially breast imaging.

Paper Details

Date Published: 24 July 1998
PDF: 7 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317008
Show Author Affiliations
Barbara A. Fecht, Advanced Diagnostics, Inc. (United States)
Michael P. Andre, Veterans Affairs Medical Ctr.-Univ. of California/San Diego (United States)
George F. Garlick, Advanced Diagnostics, Inc. (United States)
Ronald L. Shelby, Advanced Diagnostics, Inc. (United States)
Jerod O. Shelby, Advanced Diagnostics, Inc. (United States)
Constance D. Lehman, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 3336:
Medical Imaging 1998: Physics of Medical Imaging
James T. Dobbins III; John M. Boone, Editor(s)

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