A simple 5-DoF MR-compatible motion signal measurement system |
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Authors: | Chung Soon-Cheol Kim Hyung-Sik Yang Jae-Woong Lee Su-Jeong Choi Mi-Hyun Kim Ji-Hye Yeon Hong-Won Park Jang-Yeon Yi Jeong-Han Tack Gye-Rae |
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Institution: | Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, 322 Danwol-dong, Chungju, Chungbuk 380-701, Korea. |
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Abstract: | The purpose of this study was to develop a simple motion measurement system with magnetic resonance (MR) compatibility and
safety. The motion measurement system proposed here can measure 5-DoF motion signals without deteriorating the MR images,
and it has no effect on the intense and homogeneous main magnetic field, the temporal-gradient magnetic field (which varies
rapidly with time), the transceiver radio frequency (RF) coil, and the RF pulse during MR data acquisition. A three-axis accelerometer
and a two-axis gyroscope were used to measure 5-DoF motion signals, and Velcro was used to attach a sensor module to a finger
or wrist. To minimize the interference between the MR imaging system and the motion measurement system, nonmagnetic materials
were used for all electric circuit components in an MR shield room. To remove the effect of RF pulse, an amplifier, modulation
circuit, and power supply were located in a shielded case, which was made of copper and aluminum. The motion signal was modulated
to an optic signal using pulse width modulation, and the modulated optic signal was transmitted outside the MR shield room
using a high-intensity light-emitting diode and an optic cable. The motion signal was recorded on a PC by demodulating the
transmitted optic signal into an electric signal. Various kinematic variables, such as angle, acceleration, velocity, and
jerk, can be measured or calculated by using the motion measurement system developed here. This system also enables motion
tracking by extracting the position information from the motion signals. It was verified that MR images and motion signals
could reliably be measured simultaneously. |
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