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Author 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
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2011
Language English
Subject Domain (in DDC) Philosophy & psychology ♦ Psychology
Subject Keyword MR compatible ♦ 5-DoF motion signal ♦ Three-axis accelerometer ♦ Two-axis gyroscope ♦ Cognitive Psychology
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.
ISSN 07433808
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-04-13
Publisher Place New York
e-ISSN 15543528
Journal Behavior Research Methods
Volume Number 43
Issue Number 3
Page Count 5
Starting Page 897
Ending Page 901


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Source: SpringerLink