A simple 5-DoF MR-compatible motion signal measurement system

 

 

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A simple 5-DoF MR-compatible motion signal measurement system

via Behavior Research Methods (Browse Results) op 13-4-11

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.

• Content Type Journal Article
• Pages 1-5
• DOI 10.3758/s13428-011-0082-z
• Authors
  • Soon-Cheol Chung, 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
  • Hyung-Sik Kim, 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
  • Jae-Woong Yang, 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
  • Su-Jeong Lee, 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
  • Mi-Hyun Choi, 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
  • Ji-Hye Kim, 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
  • Hong-Won Yeon, 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
  • Jang-Yeon Park, 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
  • Jeong-Han Yi, 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
  • Gye-Rae Tack, 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

• Journal Behavior Research Methods
• Online ISSN 1554-3528
• Print ISSN 1554-351X

 

 

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