Measurement and correction of microscopic head motion during magnetic resonance imaging of the brain
| Autor: | Thomas Ernst, Ilja Y. Kadashevich, Maxim Zaitsev, Michael Herbst, Thomas E. Prieto, Robert T. Barrows, Todd P. Kusik, K. A. Danishad, Julian Maclaren, Oliver Speck, Brian S. R. Armstrong, Cris Lovell-Smith, Qiaotian Li, Peter Schulze, Colin L. Foster, Daniel Stucht, K. Gumus |
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| Přispěvatelé: | Hess, Christopher P |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Medical Physics
Computer science Image quality Image Processing Tracking (particle physics) 030218 nuclear medicine & medical imaging Diagnostic Radiology 0302 clinical medicine Engineering Electronics Engineering Computer-Assisted Magnetic resonance imaging of the brain Image Processing Computer-Assisted Computer vision screening and diagnosis Multidisciplinary medicine.diagnostic_test Orientation (computer vision) fMRI Tracking system Magnetic Resonance Imaging Detection Head Movements Calibration Biomedical Imaging Medicine Radiology Research Article General Science & Technology Science Biophysics Image processing Neuroimaging Bioengineering 03 medical and health sciences Clinical Research medicine Humans Biology business.industry Neurosciences Magnetic resonance imaging 4.1 Discovery and preclinical testing of markers and technologies Artificial intelligence business 030217 neurology & neurosurgery Software Neuroscience |
| Zdroj: | PLoS ONE, Vol 7, Iss 11, p e48088 (2012) PloS one, vol 7, iss 11 PLoS ONE |
| ISSN: | 1932-6203 |
| Popis: | Magnetic resonance imaging (MRI) is a widely used method for non-invasive study of the structure and function of the human brain. Increasing magnetic field strengths enable higher resolution imaging; however, long scan times and high motion sensitivity mean that image quality is often limited by the involuntary motion of the subject. Prospective motion correction is a technique that addresses this problem by tracking head motion and continuously updating the imaging pulse sequence, locking the imaging volume position and orientation relative to the moving brain. The accuracy and precision of current MR-compatible tracking systems and navigator methods allows the quantification and correction of large-scale motion, but not the correction of very small involuntary movements in six degrees of freedom. In this work, we present an MR-compatible tracking system comprising a single camera and a single 15 mm marker that provides tracking precision in the order of 10 m and 0.01 degrees. We show preliminary results, which indicate that when used for prospective motion correction, the system enables improvement in image quality at both 3 T and 7 T, even in experienced and cooperative subjects trained to remain motionless during imaging. We also report direct observation and quantification of the mechanical ballistocardiogram (BCG) during simultaneous MR imaging. This is particularly apparent in the head-feet direction, with a peak-to-peak displacement of 140 m. |
| Databáze: | OpenAIRE |
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