Respiratory gating method for MR imaging
First Claim
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1. A method for acquiring NMR image data from a subject during a scan with an MRI system, the steps comprising:
- a) monitoring the respiration of the subject;
b) producing a first gating signal when subject respiration is within a preselected narrow acquisition window;
c) producing a second gating signal when subject respiration is within a preselected wide acquisition window;
d) acquiring NMR image data from a central region of k-space when the first gating signal is produced;
e) acquiring NMR image data from a peripheral region of k-space when the second gating signal is produced; and
f) repeating steps a) through e) until sufficient NMR image data is acquired from the central and peripheral regions of k-space to reconstruct an image.
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Abstract
NMR data required to reconstruct an image is divided into central k-space views and peripheral k-space views. NMR navigator signals are acquired during a scan to indicate patient respiration and a first gating signal is produced when respiration is within a narrow acquisition window and a second gating signal is produced when respiration is within a wider acquisition window. Central k-space views are acquired when the first gating signal is produced and peripheral k-space views are acquired when the second gating signal is produced.
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Citations
16 Claims
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1. A method for acquiring NMR image data from a subject during a scan with an MRI system, the steps comprising:
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a) monitoring the respiration of the subject; b) producing a first gating signal when subject respiration is within a preselected narrow acquisition window; c) producing a second gating signal when subject respiration is within a preselected wide acquisition window; d) acquiring NMR image data from a central region of k-space when the first gating signal is produced; e) acquiring NMR image data from a peripheral region of k-space when the second gating signal is produced; and f) repeating steps a) through e) until sufficient NMR image data is acquired from the central and peripheral regions of k-space to reconstruct an image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An MRI system for acquiring NMR data from a subject during a scan, the system comprising:
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means for monitoring the respiration of the subject; means for producing a first gating signal when subject respiration is within a preselected narrow acquisition window; means for producing a second gating signal when subject respiration is within a preselected wide acquisition window; means for acquiring NMR image data which includes means for producing magnetic field gradients in response to the first gating signal to sample a central region of k-space; means for acquiring NMR image data which includes means for producing magnetic field gradients in response to the second gating signal to sample a peripheral region of k-space; and means for continually acquiring additional NMR image data until sufficient NMR image data is acquired from the central and peripheral regions of k-space to reconstruct an image. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification