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Lid closure mimics head movement in fMRI. 2002

Thomas Stephan, and Esther Marx, and Hartmut Brückmann, and Thomas Brandt, and Marianne Dieterich
Center for Sensorimotor Research, Department of Neurology, Ludwig-Maximilians University, 81377 Munich, Germany.

Motion correction algorithms are commonly used to correct for involuntary head motions in fMRI. We found that lid closure increased signal intensity of the eyes by a factor of 1.6 to 2 in EPI-fMRI. If the eyes were included in the scanning volume, transitions from eyes open to eyes closed in darkness were regularly associated with erroneously detected head translations along the z-axis and head rotations around the x-axis in Talairach's coordinate system. These artefacts could be avoided by masking the eyes in the images during the estimation of movement parameters.

UI MeSH Term Description Entries
D008297 Male Males
D009068 Movement The act, process, or result of passing from one place or position to another. It differs from LOCOMOTION in that locomotion is restricted to the passing of the whole body from one place to another, while movement encompasses both locomotion but also a change of the position of the whole body or any of its parts. Movement may be used with reference to humans, vertebrate and invertebrate animals, and microorganisms. Differentiate also from MOTOR ACTIVITY, movement associated with behavior. Movements
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D005143 Eyelids Each of the upper and lower folds of SKIN which cover the EYE when closed. Eyelid
D005260 Female Females
D006257 Head The upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the body by a neck, and containing the brain, mouth, and sense organs. Heads
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D017352 Echo-Planar Imaging A type of MAGNETIC RESONANCE IMAGING that uses only one nuclear spin excitation per image and therefore can obtain images in a fraction of a second rather than the minutes required in traditional MRI techniques. It is used in a variety of medical and scientific applications. MR Tomography, Echo-Planar,Magnetic Resonance Imaging, Echo-Planar,Echo-Planar MR Tomography,Echo-Planar Magnetic Resonance Imaging,Echoplanar Imaging,Echoplanar MR Tomography,Echoplanar Magnetic Resonance Imaging,MR Tomography, Echoplanar,Magnetic Resonance Imaging, Echoplanar,Echo Planar Imaging,Echo Planar MR Tomography,Echo Planar Magnetic Resonance Imaging,Echo-Planar Imagings,Echo-Planar MR Tomographies,Echoplanar Imagings,Echoplanar MR Tomographies,Imaging, Echo-Planar,Imaging, Echoplanar,Imagings, Echo-Planar,Imagings, Echoplanar,MR Tomographies, Echo-Planar,MR Tomographies, Echoplanar,MR Tomography, Echo Planar,Magnetic Resonance Imaging, Echo Planar,Tomographies, Echo-Planar MR,Tomographies, Echoplanar MR,Tomography, Echo-Planar MR,Tomography, Echoplanar MR

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