Adaptive keyhole compression for dynamic contrast-enhanced MRI
AssigneesKoninklijke Philips N.V., The Regents of the University of Michigan
InventorsMarko Kresimir Ivancevic, Thomas Chenevert
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Abstract
A magnetic resonance imaging system (3) includes a sequence control unit (18), a sampling unit (26), and a control unit (24). The sequence control unit (18) controls a magnetic resonance scanner (4) to acquire compressed magnetic resonance data from an imaged region of a subject. The sampling unit (26) determines a change in a concentration of a contrast agent present in the image region of the subject based on magnetic resonance signals received by a radio frequency receiver. The control unit (24) adjusts a degree of compression of the acquired magnetic resonance data based on the determination made by the sampling unit (26).
Claims17
A magnetic resonance imaging system, comprising:
- a sequence control unit configured to control a magnetic resonance scanner to perform dynamic imaging by acquiring compressed magnetic resonance data from an imaged region of a subject including fully sampling a central portion of k-space and partially sampling a peripheral portion of k-space;
- a sampling unit which determines a rate of change in a concentration of a contrast agent present in the image region of the subject during the dynamic imaging based on magnetic resonance signals received by a radio frequency receiver;
- and
- a control unit which adjusts a degree of compression of the acquired magnetic resonance data during the dynamic imaging based on the determination made by the sampling unit;
- wherein the control unit adjusts gradient fields to decrease the central portion of k-space and increase the peripheral portion of k-space in response to an increase in the rate of change in the concentration of the contrast agent and adjusts the gradient fields to increase the central portion of k-space and decrease the peripheral portion of k-space in response to a decrease in the rate of change in the concentration of the contrast agent.
A method of magnetic resonance imaging with a contrast agent, comprising:
- performing dynamic imaging by acquiring, from a magnetic resonance scanner, compressed magnetic resonance data from an imaged region of a subject wherein a degree of compression is controlled by a proportion of k-space which is fully sampled;
- determining a rate of change in a concentration of a contrast agent present in the image region of the subject during the dynamic imaging based on the acquired magnetic resonance data;
- and
- adjusting the degree of compression of the acquiring magnetic resonance data during the dynamic imaging based on the determined rate of change in concentration of the contrast agent;
- wherein the adjusting includes:
- if the rate of change in the concentration of the contrast agent increases, decreasing the proportion of k-space which is fully sampled;
- and
- if the rate of change in the concentration of the contrast agent decreases, increasing the proportion of k-space that is fully sampled.
A magnetic resonance imaging device comprising:
- a magnetic resonance scanner configured to perform dynamic imaging by acquiring compressed magnetic resonance data from an imaged region of a subject with an amount of compression controlled by a degree of undersampling of k-space;
- and
- a computer programmed to:
- determine a rate of change in the acquired compressed magnetic resonance data during the dynamic imaging;
- increase the amount of compression in response to a higher rate of change in the acquired compressed magnetic resonance data;
- and
- decrease the amount of compression in response to a lower rate of change in the acquired compressed magnetic resonance data.
Dependencies are inferred from the claim text.