DocumentCode :
2691789
Title :
An axial array for three-dimensional intravascular ultrasound
Author :
Alles, Erwin J. ; van Dijk, Gerrit J. ; van der Steen, Anton F. W. ; Gisolf, Andries ; van Dongen, K.W.A.
Author_Institution :
Lab. of Acoust. Wavefield Imaging, Delft Univ. of Technol., Delft, Netherlands
fYear :
2012
fDate :
7-10 Oct. 2012
Firstpage :
1153
Lastpage :
1156
Abstract :
With intravascular ultrasound, high resolution cross-sectional images of arterial walls can be obtained. By pulling a catheter through the artery in the axial direction and stacking consecutive cross-sectional images, a three-dimensional image is obtained. However, cardiac and respiratory motion, combined with a high pull-back rate and a narrow axial radiation pattern, result in poor axial resolution and significant image distortion. To avoid these limitations, in this work the design of an axial linear transducer array is presented with which volumetric rather than cross-sectional images are obtained in every pullback position. The prototype consists of eight elements of dimensions 100 μm by 350 μm, with a kerf of 100 μm, operating at a center frequency of 21 MHz with a bandwidth of more than 80 %. For both an ex vivo bovine artery and a stent-emulating phantom, the image quality in the circumferential and radial directions is similar to that of a conventional catheter. However, in the axial direction a significant increase in image quality is achieved. With the array, it is possible to image both the struts of a stent phantom and the underlying structures, whereas with the conventional catheter the struts are not properly localised and the underlying tissue is not distinguishable from the stent.
Keywords :
biomedical transducers; biomedical ultrasonics; blood vessels; catheters; haemodynamics; phantoms; pneumodynamics; stents; ultrasonic transducer arrays; arterial walls; axial linear transducer array; cardiac motion; catheter; ex vivo bovine artery; high resolution cross-sectional images; narrow axial radiation pattern; respiratory motion; size 100 mum; size 350 mum; stent-emulating phantom; three-dimensional image; three-dimensional intravascular ultrasound axial array; Arrays; Arteries; Catheters; Image quality; Image resolution; Phantoms; Ultrasonic imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium (IUS), 2012 IEEE International
Conference_Location :
Dresden
ISSN :
1948-5719
Print_ISBN :
978-1-4673-4561-3
Type :
conf
DOI :
10.1109/ULTSYM.2012.0287
Filename :
6562251
Link To Document :
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