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Proceedings Paper

Projection ultrasound and ultrasound CT using a PE-CMOS sensor: a preliminary study
Author(s): Chu Chuan Liu; Shih-Chung Benedict Lo; Matthew T. Freedman; David Rich; John Kula; Bob Lasser; Marvin E. Lasser; JianChao Zeng; Doug Ro
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Paper Abstract

The purpose of this study is to investigate the feasibility of generating 3D projection ultrasound computed tomography images using a transmission ultrasound system via a piezoelectric material coated CMOS ultrasound sensing array. There are four main components in the laboratory setup: (1) a transducer operated at 5MHz frequency generating unfocused ultrasound plane waves, (2) an acoustic compound lens that collects the energy and focuses ultrasound signals onto the detector array, and (3) a CMOS ultrasound sensing array (Model I100, Imperium Inc. Silver Spring, MD) that receives the ultrasound and converts the energy to analog voltage followed by a digital conversion, and (4) a stepping motor that controls the rotation of the target for each projection view. The CMOS array consists of 128×128 pixel elements with 85μm per pixel. The system can generate an ultrasound attenuation image similar to a digital image obtained from an x-ray projection system. A computed tomography (CT) study using the ultrasound projection was performed. The CMOS array acquired ultrasound attenuation images of the target. A total of 400 projections of the target image were generated to cover 180o rotation of the CT scan, each with 0.45° increment. Based on these 400 projection views, we rearranged each line profile in the corresponding projection views to form a sinogram. For each sinogram, we computed the cross section image of the target at the corresponding slice. Specifically, the projection ultrasound computed tomography (PUCT) images were reconstructed by applying the filtered back-projection method with scattering compensation technique. Based on the sequential 2D PUCT images of the target, we generated the 3D PUCT image.

Paper Details

Date Published: 28 April 2004
PDF: 9 pages
Proc. SPIE 5373, Medical Imaging 2004: Ultrasonic Imaging and Signal Processing, (28 April 2004); doi: 10.1117/12.537672
Show Author Affiliations
Chu Chuan Liu, Georgetown Univ. Medical Ctr. (United States)
Virginia Polytechnic Institute and State Univ. (United States)
Shih-Chung Benedict Lo, Georgetown Univ. Medical Ctr. (United States)
Matthew T. Freedman, Georgetown Univ. Medical Ctr. (United States)
David Rich, Imperium, Inc. (United States)
John Kula, Imperium, Inc. (United States)
Bob Lasser, Imperium, Inc. (United States)
Marvin E. Lasser, Imperium, Inc. (United States)
JianChao Zeng, Howard Univ. (United States)
Doug Ro, Virginia Commonwealth Univ. Health System (United States)

Published in SPIE Proceedings Vol. 5373:
Medical Imaging 2004: Ultrasonic Imaging and Signal Processing
William F. Walker; Stanislav Y. Emelianov, Editor(s)

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