Key result
A 7 MHz, 2-D array transducer built on a silicon substrate inside a 9-French catheter achieved a spatial resolution of 2 mm at 1 cm depth in real-time volumetric imaging of in-vitro sheep hearts.
A novel 7 MHz 2-D array transducer on a silicon substrate demonstrates feasibility for real-time intracardiac volumetric imaging with adequate spatial resolution in vitro.
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Demonstrates feasibility of silicon-based 2-D arrays for volumetric ICE; leaves open in-vivo validation and clinical translation.
The design, fabrication, and characterization of a 7 MHz, two-dimensional (2-D) array transducer built on a silicon substrate is described. The array fits inside a 9-French (2.9 mm O.D.) catheter for use in real-time intracardiac volumetric imaging. The -6 dB fractional bandwidth of the transducer is 30%, the 50 ohm pitch-catch insertion loss is 78 dB, and the interelement crosstalk is -25 dB. Real-time volumetric images in phantoms and in-vitro images of a sheep heart have been acquired yielding measured spatial resolution of 2 mm at a depth of 1 cm. The cardiac structures imaged include ventricular chambers, interventricular septum, mitral and tricuspid valves and real-time 3-D rendered volumes of the tricuspid valve in the open and closed position.
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Lee et al. (2002) studied this question. 7 MHz, 2-D array transducer on a silicon substrate was evaluated on Transducer characterization and imaging capability. A 7 MHz, 2-D array transducer built on a silicon substrate inside a 9-French catheter achieved a spatial resolution of 2 mm at 1 cm depth in real-time volumetric imaging of in-vitro sheep hearts.
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