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Proceedings Paper

In vivo real-time volumetric synthetic aperture ultrasound imaging
Author(s): Hamed Bouzari; Morten Fischer Rasmussen; Andreas Hjelm Brandt M.D.; Matthias Bo Stuart; Svetoslav Nikolov; Jørgen Arendt Jensen
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Paper Abstract

Synthetic aperture (SA) imaging can be used to achieve real-time volumetric ultrasound imaging using 2-D array transducers. The sensitivity of SA imaging is improved by maximizing the acoustic output, but one must consider the limitations of an ultrasound system, both technical and biological. This paper investigates the in vivo applicability and sensitivity of volumetric SA imaging. Utilizing the transmit events to generate a set of virtual point sources, a frame rate of 25 Hz for a 90° × 90° field-of-view was achieved. data were obtained using a 3.5 MHz 32 × 32 elements 2-D phased array transducer connected to the experimental scanner (SARUS). Proper scaling is applied to the excitation signal such that intensity levels are in compliance with the U.S. Food and Drug Administration regulations for in vivo ultrasound imaging. The measured Mechanical Index and spatial-peak-temporal-average intensity for parallel beam-forming (PB) are 0.83 and 377.5mW/cm2, and for SA are 0.48 and 329.5mW/cm2. A human kidney was volumetrically imaged with SA and PB techniques simultaneously. Two radiologists for evaluation of the volumetric SA were consulted by means of a questionnaire on the level of details perceivable in the beam-formed images. The comparison was against PB based on the in vivo data. The feedback from the domain experts indicates that volumetric SA images internal body structures with a better contrast resolution compared to PB at all positions in the entire imaged volume. Furthermore, the autocovariance of a homogeneous area in the in vivo SA data, had 23.5% smaller width at the half of its maximum value compared to PB.

Paper Details

Date Published: 17 March 2015
PDF: 10 pages
Proc. SPIE 9419, Medical Imaging 2015: Ultrasonic Imaging and Tomography, 94190I (17 March 2015); doi: 10.1117/12.2081631
Show Author Affiliations
Hamed Bouzari, Technical Univ. of Denmark (Denmark)
Morten Fischer Rasmussen, Technical Univ. of Denmark (Denmark)
Andreas Hjelm Brandt M.D., Copenhagen Univ. Hospital Rigshopitalet (Denmark)
Matthias Bo Stuart, Technical Univ. of Denmark (Denmark)
Svetoslav Nikolov, BK Medical ApS (Denmark)
Jørgen Arendt Jensen, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 9419:
Medical Imaging 2015: Ultrasonic Imaging and Tomography
Johan G. Bosch; Neb Duric, Editor(s)

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