TECHNIQUES FOR CORRECTING TEMPERATURE MEASUREMENT IN MAGNETIC RESONANCE THERMOMETRY
First Claim
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1. A method of correcting proton resonance frequency (PRF) based magnetic resonance (MR) temperature measurement, the method comprising the steps of:
- detecting at least one first MR response of one or more micro-coils located in or near a region of interest, the detection being performed approximately when a first PRF image of the region of interest is acquired;
detecting at least one second MR response of the one or more micro-coils approximately when a second PRF image of the region of interest is acquired;
determining a temperature-invariant difference between the at least one second MR response and the at least one first MR response, the temperature-invariant difference being caused by factors unrelated to a temperature change in or near the region of interest; and
correcting, based on the temperature-invariant difference, a temperature measurement of the region of interest made from the second PRF image and the first PRF image.
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Abstract
Techniques for correcting temperature measurement in MR thermometry are disclosed. In particular, phase shifts that arise from factors other than temperature changes are detected, facilitating correction of temperature measurements.
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Citations
34 Claims
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1. A method of correcting proton resonance frequency (PRF) based magnetic resonance (MR) temperature measurement, the method comprising the steps of:
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detecting at least one first MR response of one or more micro-coils located in or near a region of interest, the detection being performed approximately when a first PRF image of the region of interest is acquired; detecting at least one second MR response of the one or more micro-coils approximately when a second PRF image of the region of interest is acquired; determining a temperature-invariant difference between the at least one second MR response and the at least one first MR response, the temperature-invariant difference being caused by factors unrelated to a temperature change in or near the region of interest; and correcting, based on the temperature-invariant difference, a temperature measurement of the region of interest made from the second PRF image and the first PRF image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for correcting proton resonance frequency (PRF) based magnetic resonance (MR) temperature measurement, the system comprising:
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an MRI unit; one or more micro-coils configured to generate MR response signals in response to the MRI unit, the one or more micro-coils being sufficiently small to be placed in or near a region of interest; a control module in communication with the MRI unit and the one or more micro-coils, and configured to; cause at least one first MR response of the one or more micro-coils to be detected approximately when the MRI unit acquires a first PRF image of the region of interest, and cause at least one second MR response of the one or more micro-coils to be detected approximately when the MRI unit acquires a second PRF image of the region of interest; and a processing module configured to; determine a temperature-invariant difference between the at least one second MR response and the at least one first MR response, the temperature-invariant difference being caused by factors unrelated to a temperature change in or near the region of interest, and correct, based on the temperature-invariant difference, a temperature measurement of the region of interest made from the second PRF image and the first PRF image. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A computer-readable medium storing computer-executable codes for causing at least one processor to correct proton resonance frequency (PRF) based magnetic resonance (MR) temperature measurement, the computer readable medium comprising:
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computer-executable code adapted to detect at least one first MR response of one or more micro-coils located in or near a region of interest, the detection being performed approximately when a first PRF image of the region of interest is acquired; computer-executable code adapted to detect at least one second MR response of the one or more micro-coils approximately when a second PRF image of the region of interest is acquired; computer-executable code adapted to determine a temperature-invariant difference between the at least one second MR response and the at least one first MR response, the temperature-invariant difference being caused by factors unrelated to a temperature change in or near the region of interest; and computer-executable code adapted to correct, based on the temperature-invariant difference, a temperature measurement of the region of interest made from the second PRF image and the first PRF image. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification