J Korean Soc Magn Reson Med.  2012 Apr;16(1):55-66. 10.13104/jksmrm.2012.16.1.55.

Head Motion Detection and Alarm System during MRI scanning

• Pae C
• Park HJ
• Kim DJ

• KMID: 2099838
• DOI: http://doi.org/10.13104/jksmrm.2012.16.1.55

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.

Keyword

Magnetic resonance imaging; Functional MRI; Head motion; Motion detection

MeSH Terms

Brain
Calibration
Eyeglasses
Glass
Head
Head Movements
Imidazoles
Magnetic Resonance Imaging
Magnetics
Magnets
Nitro Compounds
Track and Field
Imidazoles
Nitro Compounds

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