Basic Science and Instrumentation Scientific Session 3
Low element count 2D array for forward-viewing robotically steered guidewire to guide endovascular revascularization
Tuesday, April 9, 2024
5:07pm – 5:19pm
Location: 412
Authors: Adeoye Olomodosi, Georgia Institute of Technology Stephan Strassle Rojas, Georgia Institute of Technology Brooks Lindsey, Georgia Institute of Technology and Emory University
Peripheral artery disease affects over 200 million people globally. Approximately 2% of people with PAD present with critical limb ischemia each year, requiring urgent revascularization to avoid loss of limb. Minimally-invasive (i.e. endovascular) revascularization is preferable due to decreased recovery time and decreased complication rate compared to open surgery. However, >20% of revascularization procedures fail when patients have chronic total occlusions (CTOs) because the interventionalist cannot route the guidewire beyond the CTO encountered before reaching the symptomatic lesion. We designed and developed a low element count (3 3) 2D array for the tip of a robotically-steered guidewire. Images are formed through synthetic aperture beamforming by combining signals acquired on all elements as the mechanically-steered guidewire is steered through the arteries. Beamformed SNR increased by 3 dB and lateral resolution increased by 9% compared to single element imaging. 3D images of a peripheral stent and ex vivo porcine iliac artery demonstrate sufficient resolution and sensitivity for 3D guidance. For applications where some mechanical steering of the tip is possible, a hybrid approach combining advantages of synthetic aperture and phased array imaging can provide forward-viewing guidance with increased SNR and sensitivity to motion in a 1 mm device at a lower system cost than a high element count 2D array.