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Proceedings Paper

Radiation force imaging: challenges and opportunities
Author(s): Gregg E. Trahey; Mark Palmeri; Kathryn Nightingale; Jeremy Dahl
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Paper Abstract

A number of novel imaging modalities have been developed to interrogate the mechanical properties of tissue. A subset of these methods utilize acoustic radiation force to mechanically excite tissue and form images from the local responses of tissue to these excitations. These methods are attractive because of the ability to focus and steer the excitatory beams and to control their spatial and temporal characteristics using techniques similar to those employed in conventional ultrasonic imaging. These capabilities allow for a wide variety of imaging methods whose features are only beginning to be explored. However, radiation force based methods also present significant challenges. Tissue and transducer heating limit the tissue displacements achievable with radiation force applications and restrict image frame rates and fields-of-view. The small tissue displacements are difficult to detect and may be obscured by physiologic tissue motion. We review the fundamental limits of imaging methods based on radiation force generated by patient safety concerns and the impact of these limits on achievable image signal-to-noise ratios and frame rates. We also review our progress to date in the development and clinical evaluation of one class of radiation force imaging methods employing very brief impulses of radiation force.

Paper Details

Date Published: 12 March 2007
PDF: 9 pages
Proc. SPIE 6513, Medical Imaging 2007: Ultrasonic Imaging and Signal Processing, 65130E (12 March 2007); doi: 10.1117/12.719470
Show Author Affiliations
Gregg E. Trahey, Duke Univ. (United States)
Mark Palmeri, Duke Univ. (United States)
Kathryn Nightingale, Duke Univ. (United States)
Jeremy Dahl, Duke Univ. (United States)

Published in SPIE Proceedings Vol. 6513:
Medical Imaging 2007: Ultrasonic Imaging and Signal Processing
Stanislav Y. Emelianov; Stephen A. McAleavey, Editor(s)

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