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Proceedings Paper

CMUT-based volumetric ultrasonic imaging array design for forward looking ICE and IVUS applications
Author(s): Coskun Tekes; Jaime Zahorian; Toby Xu; Muhammad W. Rashid; Sarp Satir; Gokce Gurun; Mustafa Karaman; Jennifer Hasler; F. Levent Degertekin
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Paper Abstract

Designing a mechanically flexible catheter based volumetric ultrasonic imaging device for intravascular and intracardiac imaging is challenging due to small transducer area and limited number of cables. With a few parallel channels, synthetic phased array processing is necessary to acquire data from a large number of transducer elements. This increases the data collection time and hence reduces frame rate and causes artifacts due to tissue-transducer motion. Some of these drawbacks can be resolved by different array designs offered by CMUT-on-CMOS approach. We recently implemented a 2.1-mm diameter single chip 10 MHz dual ring CMUT-on-CMOS array for forward looking ICE with 64-transmit and 56-receive elements along with associated electronics. These volumetric arrays have the small element size required by high operating frequencies and achieve sub mm resolution, but the system would be susceptible to motion artifacts. To enable real time imaging with high SNR, we designed novel arrays consisting of multiple defocused annular rings for transmit aperture and a single ring receive array. The annular transmit rings are utilized to act as a high power element by focusing to a virtual ring shaped line behind the aperture. In this case, image reconstruction is performed by only receive beamforming, reducing total required firing steps from 896 to 14 with a trade-off in image resolution. The SNR of system is improved more than 5 dB for the same frequency and frame rate as compared to the dual ring array, which can be utilized to achieve the same resolution by increasing the operating frequency.

Paper Details

Date Published: 29 March 2013
PDF: 6 pages
Proc. SPIE 8675, Medical Imaging 2013: Ultrasonic Imaging, Tomography, and Therapy, 86750B (29 March 2013); doi: 10.1117/12.2007042
Show Author Affiliations
Coskun Tekes, Georgia Institute of Technology (United States)
Jaime Zahorian, Georgia Institute of Technology (United States)
Toby Xu, Georgia Institute of Technology (United States)
Muhammad W. Rashid, Georgia Institute of Technology (United States)
Sarp Satir, Georgia Institute of Technology (United States)
Gokce Gurun, Georgia Institute of Technology (United States)
Mustafa Karaman, Isik Univ. (Turkey)
Jennifer Hasler, Georgia Institute of Technology (United States)
F. Levent Degertekin, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8675:
Medical Imaging 2013: Ultrasonic Imaging, Tomography, and Therapy
Johan G. Bosch; Marvin M. Doyley, Editor(s)

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