Movement Measurement Systems for fMRI Motion Studies

Abstract

In this study, functional magnetic resonance image (fMRI)-compatible movement measurement system was developed. The movement measurement system consisted of a sensor module with a three-axis accelerometer and a two-axis gyroscope, a modulator, and a demodulator. Velcro was used to attach the sensor module to a finger or wrist. Interactive effects in a human subject were tested by measuring fMRI and motion signals simultaneously. Images were obtained using the field echo planar imaging method using a 3 T MR scanner and the signal-to-noise ratio was calculated. The entire system can be made with low cost, and its direct implementation is available in a clinical MR scanner without any additional installation. Various kinematic variables, such as angle, acceleration, and jerk, can be measured and calculated by using the movement measurement system. Therefore, it is expected that this system could be used for the study of the relationship between various kinematic variables and brain function.