Motion detector for high-resolution magnetic resonance imaging
First Claim
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1. In a Magnetic Resonance Imaging system having a magnet which produces a magnetic field, an apparatus for detecting movement of an anatomical sample and undergoing NMR analysis, said apparatus comprising:
- means for illuminating said sample;
a plurality of sensors, each located outside of an imaging volume of said magnet, for receiving reflected illumination from the sample, and each of said sensors having an output responsive to said reflected illumination;
means for directing a field-of-view of each of said sensors to a selected portion of said sample within said imaging volume andmeans for monitoring the output of each of said sensors to detect a change in the amount of said reflected illumination received responsive to the movement of said sample.
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Abstract
Apparatus for detecting movement of an anatomical sample undergoing NMR imaging uses at least one optical sensor, each having an output responsive to the intensity of received illumination and each directed to view a selected portion of sample; and apparatus for monitoring the output of each sensor to detect a change therein responsive to movement of the sample.
57 Citations
9 Claims
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1. In a Magnetic Resonance Imaging system having a magnet which produces a magnetic field, an apparatus for detecting movement of an anatomical sample and undergoing NMR analysis, said apparatus comprising:
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means for illuminating said sample; a plurality of sensors, each located outside of an imaging volume of said magnet, for receiving reflected illumination from the sample, and each of said sensors having an output responsive to said reflected illumination; means for directing a field-of-view of each of said sensors to a selected portion of said sample within said imaging volume and means for monitoring the output of each of said sensors to detect a change in the amount of said reflected illumination received responsive to the movement of said sample. - View Dependent Claims (2, 3, 4)
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5. In a Magnetic Resonance Imaging system having a magnet which produces a magnetic field, an apparatus for determining movement of an eye undergoing NMR analysis, said apparatus comprising:
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means for illuminating selected area of said eye; means located outside of an imaging volume of said magnet for sensing the illumination from the selected area and providing at least one selected signal responsive to the amplitude thereof; means for focusing the sensed illumination from each of said selected areas of said eye upon a different one of said sensing means; and means operating upon the amplitude of at least one of said selected sensor signals for detecting eye movement by a change in said amplitude. - View Dependent Claims (6, 7, 8, 9)
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Specification