The cardiovascular health of the human population is a major concern for medical clinicians, with cardiovascular diseases responsible for 48% of all deaths worldwide, according to the World Health Organization. The development of new diagnostic tools that are practicable and economical to scrutinize the cardiovascular health of humans is a major driver for clinicians. We offer a new technique to obtain seismocardiographic signals up to 54 Hz covering both ballistocardiography (below 20 Hz) and audible heart sounds (20 Hz upward), using a system based on curvature sensors formed from fiber optic long period gratings. This system can visualize the real-time three-dimensional (3-D) mechanical motion of the heart by using the data from the sensing array in conjunction with a bespoke 3-D shape reconstruction algorithm. Visualization is demonstrated by adhering three to four sensors on the outside of the thorax and in close proximity to the apex of the heart; the sensing scheme revealed a complex motion of the heart wall next to the apex region of the heart. The detection scheme is low-cost, portable, easily operated and has the potential for ambulatory applications.
Bibliographical noteThomas Allsop ; Glynn Lloyd ; Ranjeet S. Bhamber ; Ljupco Hadzievski ; Michael Halliday, et al., "Cardiac-induced localized thoracic motion detected by a fiber optic sensing scheme", J. Biomed. Opt. 19(11), 117006 (Nov 13, 2014).
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Funding: Grant No. EP/J010413 UK Engineering and Physical Sciences Research Council
- cardio measurement
- curvature sensing
- long period gratings