Apparatus for dynamic angular position tracking
First Claim
1. A method of correcting for the motion of a subject during a magnetic resonance imaging (“
- MRI”
) scan, comprising;
acquiring a nuclear magnetic resonance (“
NMR”
) spectra of an ordered material attached to a subject, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in a magnetic field; and
determining an orientation of the subject.
1 Assignment
0 Petitions
Accused Products
Abstract
A magnetic resonance imaging (“MRI”) system and method of correcting for the motion of a subject during an MRI scan. The motion of a subject in an MRI scan is corrected by acquiring nuclear magnetic resonance (“NMR”) spectra of an ordered material attached to a subject, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in a magnetic field, and determining an orientation of the subject. Correction information is then supplied to a primary spectrometer channel which is used to execute an MRI scan, and an imaging pulse sequence of the MRI scan is adjusted to correct the subject'"'"'s orientation.
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Citations
56 Claims
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1. A method of correcting for the motion of a subject during a magnetic resonance imaging (“
- MRI”
) scan, comprising;
acquiring a nuclear magnetic resonance (“
NMR”
) spectra of an ordered material attached to a subject, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in a magnetic field; and
determining an orientation of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- MRI”
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18. A method of determining the initial orientation of an ordered material during an MRI scan, comprising:
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varying an ordered material'"'"'s orientation in an MRI scanner'"'"'s magnetic field, such that its splitting maxima or shifting maxima are located, in order to find the ordered material'"'"'s principal axes;
sealing the ordered material in its initial orientation in a solenoid coil included in an RF transmit/receive circuit; and
acquiring an NMR spectra of the ordered material at a range of angles. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A method of correcting for the motion of a subject during an MRI scan, comprising:
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attaching an RF transmit/receive circuit to a subject, wherein the RF transmit/receive circuit includes a pre-calibrated ordered material embedded in a solenoid coil;
acquiring an NMR spectra of the ordered material, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in a magnetic field;
determining an orientation of the subject by accessing calibration tables pertaining to the ordered material;
supplying correction information to a primary spectrometer channel, which is used to execute an MRI scan, based on the determined orientation of the subject to adjust at least one MRI scan parameter; and
adjusting an imaging pulse sequence of the MRI scan, based on the correction information, to correct the subject'"'"'s orientation.
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26. A system of correcting for the motion of a subject during an MRI scan, comprising:
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means for acquiring an NMR spectra of an ordered material attached to a subject, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in the magnetic field; and
means for determining the orientation of the subject. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A system of determining the initial orientation of an ordered material during an MRI scan, comprising:
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means for varying an ordered material'"'"'s orientation in an MRI scanner'"'"'s magnetic field, such that its splitting maxima or shifting maxima are located, in order to find the ordered material'"'"'s principal axes;
means for sealing the ordered material in its initial orientation in a solenoid coil included in an RF transmit/receive circuit; and
means for acquiring an NMR spectra of the ordered material at a range of angles. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. An apparatus for correcting for the motion of a subject during an MRI scan, comprising:
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an MRI system; and
a computer programmed to;
acquire an NMR spectra of an ordered material attached to a subject, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in a magnetic field; and
determine an orientation of the subject. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55)
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56. A program stored on a computer readable medium and executable by a processor comprising:
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instruction code which, when executed by the processor, acquires an NMR spectra of an ordered material attached to a subject, wherein there is a dependence on the NMR spectra of the ordered material'"'"'s orientation in a magnetic field;
instruction code which, when executed by the processor, determines an orientation of the subject;
instruction code which, when executed by the processor, supplies correction information to a primary spectrometer channel, which is used to execute an MRI scan, based on the determined orientation of the subject to adjust at least one MRI scan parameter; and
instruction code which, when executed by the processor, adjusts an imaging pulse sequence of an MRI scan, based on the correction information, to correct the subject'"'"'s orientation.
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Specification