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Head Motion Detection and Alarm System during MRI scanning  

Pae, Chong-Won (Brain Korea 21 Project for Medical Science, Yonsei University)
Park, Hae-Jeong (Brain Korea 21 Project for Medical Science, Yonsei University)
Kim, Dae-Jin (Department of Radiology and Division of Nuclear Medicine, College of Medicine, Yonsei University)
Publication Information
Investigative Magnetic Resonance Imaging / v.16, no.1, 2012 , pp. 55-66 More about this Journal
Abstract
Purpose : During brain MRI scanning, subject's head motion can adversely affect MRI images. To minimize MR image distortion by head movement, we developed an optical tracking system to detect the 3-D movement of subjects. Materials and Methods: The system consisted of 2 CCD cameras, two infrared illuminators, reflective sphere-type markers, and frame grabber with desktop PC. Using calibration which is the procedure to calculate intrinsic/extrinsic parameters of each camera and triangulation, the system was desiged to detect 3-D coordinates of subject's head movement. We evaluated the accuracy of 3-D position of reflective markers on both test board and the real MRI scans. Results: The stereo system computed the 3-D position of markers accurately for the test board and for the subject with glasses with attached optical reflective marker, required to make regular head motion during MRI scanning. This head motion tracking didn't affect the resulting MR images even in the environment varying magnetic gradient and several RF pulses. Conclusion: This system has an advantage to detect subject's head motion in real-time. Using the developed system, MRI operator is able to determine whether he/she should stop or intervene in MRI acquisition to prevent more image distortions.
Keywords
Magnetic resonance imaging; Functional MRI; Head motion; Motion detection;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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