Method for performing magnetic resonance angiography using a contrast agent
First Claim
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1. A method for producing an image with NMR data acquired from a region of interest in a patient placed in an MRI system, the steps comprising:
- a) injecting a contrast agent into the patient;
b) producing a monitor signal by repeatedly acquiring NMR data from a monitor region in the patient using a monitor pulse sequence in the MRI system;
c) detecting the flow of contrast agent into the region of interest by monitoring the value of the monitor signal;
d) acquiring NMR image data from the region of interest using a series of image pulse sequences in the MRI system when the flow of contrast agent into the region of interest is detected; and
e) reconstructing an image using the acquired NMR image data.
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Abstract
A 3DFT MRA dynamic study is performed using a contrast agent to enhance image contrast. A monitor pulse sequence is performed at a high temporal rate to monitor the magnitude of the NMR signal produced in a monitor region after the contrast agent is injected into the patient. When the monitor signal reaches a threshold value, the patient is signaled and the 3DFT image data set is acquired.
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Citations
24 Claims
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1. A method for producing an image with NMR data acquired from a region of interest in a patient placed in an MRI system, the steps comprising:
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a) injecting a contrast agent into the patient; b) producing a monitor signal by repeatedly acquiring NMR data from a monitor region in the patient using a monitor pulse sequence in the MRI system; c) detecting the flow of contrast agent into the region of interest by monitoring the value of the monitor signal; d) acquiring NMR image data from the region of interest using a series of image pulse sequences in the MRI system when the flow of contrast agent into the region of interest is detected; and e) reconstructing an image using the acquired NMR image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for producing an image with NMR data acquired from a region of interest in a patient placed in an MRI system, the steps comprising:
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a) injecting a contrast agent into the patient; b) producing a monitor signal by repeatedly acquiring NMR data from a monitor region in the patient using a monitor pulse sequence in the MRI system; c) detecting the flow of contrast agent into the region of interest by monitoring the value of the monitor signal; d) acquiring NMR image data from the region of interest using a series of image pulse sequences in the MRI system when the flow of contrast agent into the region of interest is detected; e) reconstructing an image using the acquired NMR image data; and in which the mean value of the monitor signal is calculated and step (d) is performed after the value of the monitor signal exceeds a selected number of standard deviations from its calculated mean value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification