Figure 1
From: Non-invasive cardiac pacing with image-guided focused ultrasound
Schematic of the ex vivo experimental setup and corresponding MR image.
A beating pig heart (Langendorff perfusion) is set in a tank filled with a mix of Tyrode buffer and autologous blood. The ultrasonic probe (256 elements phased-array operating at 1 MHz) is positioned underneath and can sonicate the different heart cavities through the acoustic window. This setup is placed inside a 1.5T MR scan for image guidance. Electrical and intraventricular recordings are recorded in the different heart cavities from MRI compatible catheters and the ultrasound pulses are synchronized on the heart cycle with adjustable delays.
