Unlike many other engineering designs, the heart, a pressure vessel, shows variations within its chambers and surface in terms of mechanical function. This necessitates a whole field technique with high spatial resolution. Computer aided speckle interferometry (CASI), a nondestructive examination technique, is herein developed for this purpose. A speckle pattern was created on the surface of isolated rabbit hearts. Images of the beating hearts werc acquired with a charge-couple device (CCD) camera for one second at a rate of 50 frames per second. CASI was used to determine the 2-D displacement vectors over regions of approximately 4 × 6 mm. Regional area stroke work (the integral of the left ventricular pressure with respect to area), the first invariant of the 2-D strain tensor, and the principle strains were used to determine the regional function. After occluding the blood supply to a region of the heart, significant changes were detected in all the previously mentioned parameters. Commonly used techniques cannot determine 2-D strain and lack the high spatial resolution of CASI. Determination of the 2-D strain can provide useful data on the functionality of the heart.
Determination of the Regional Function of the Heart
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Azeloglu, EU, Gaudette, GR, Krukenkamp, IB, & Chiang, F. "Determination of the Regional Function of the Heart." Proceedings of the ASME 2002 Pressure Vessels and Piping Conference. Piping and Component Analysis and Diagnosis. Vancouver, BC, Canada. August 5–9, 2002. pp. 137-145. ASME. https://doi.org/10.1115/PVP2002-1528
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