MR Compatible Sensor for Measuring Respiratory Motion Based on Acceleration.

Laure Rousselet^1,2, Marina Filipovic^1,2, Zhor Ramdan-Cherif^1,2, Valrie Laurent, ^2,3, Cdric Pasquier⁴, Jacques Felblinger^1,2

MR acquisitions have to be synchronized with respiration to avoid motion artifacts. Pneumatic belts are the most current tool for this purpose. However, these belts suffer from signal drifts, leaks in pneumatic system and give only an average displacement. We present a MR compatible sensor which aims at measuring the acceleration of a localized region. Accelerometer is well correlated to image-based displacement measures and gives similar results to respiratory belts. The sensor presents practical advantages: it is small, easy to position on the patient, less cumbersome than respiratory bellows and allows for local displacement estimation.