MRI-BASED TEMPERATURE MAPPING WITH ERROR COMPENSATION
First Claim
1. A method of determining a change in temperature of a heated portion of a tissue mass using magnetic resonance imaging techniques, comprising:
- measuring an apparent change in temperature of the heated portion;
measuring an apparent change in temperature of an unheated portion of the mass located in a neighborhood of the heated portion; and
adjusting the measured apparent change in temperature of the heated portion based at least in part on the measured apparent change in temperature of the unheated portion.
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Accused Products
Abstract
Magnetic resonance temperature change monitoring of a heated portion of a tissue mass undergoing thermal treatment is more accurately accomplished by compensating for false temperature change measurements caused by movement of the mass and/or temporal changes of the magnetic field during the thermal MR Imaging, wherein the compensation is based on subtracting out “apparent temperature change” measurements of one or more unheated portions of the tissue mass located in a neighborhood of the heated portion, which form a temperature bias map of the tissue mass region.
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Citations
34 Claims
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1. A method of determining a change in temperature of a heated portion of a tissue mass using magnetic resonance imaging techniques, comprising:
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measuring an apparent change in temperature of the heated portion;
measuring an apparent change in temperature of an unheated portion of the mass located in a neighborhood of the heated portion; and
adjusting the measured apparent change in temperature of the heated portion based at least in part on the measured apparent change in temperature of the unheated portion. - View Dependent Claims (2, 3, 4)
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5. A method of determining a change in temperature of a heated portion of a tissue mass using magnetic resonance techniques, comprising:
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measuring an apparent temperature change of each of a plurality of unheated portions of the mass located in a neighborhood of the heated portion;
measuring an apparent temperature change of the heated portion; and
adjusting the measured apparent change in temperature of the heated portion based at least in part on the measured apparent change in temperatures of the unheated portions. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 20, 21)
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15. A method of determining a temperature of a heated portion of a tissue mass using magnetic imaging techniques, comprising:
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(a) measuring an apparent temperature change of each of a plurality of unheated portions of the mass located in a neighborhood of the heated portion;
(b) determining a characteristic of a bias temperature field based on the apparent temperature changes measured in step (a);
(c) measuring an apparent temperature change of the heated portion;
(d) calculating a bias temperature change value corresponding the position of the heated portion based on the bias temperature field characteristic determined in step (b); and
(e) adjusting the temperature change measurement made in step (c) based on the bias temperature change value calculated in step (d).
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18. A system for monitoring a change in temperature of a heated portion of a tissue mass using magnetic resonance imaging techniques, the system configured to:
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measure an apparent change in temperature of the heated portion;
measure an apparent change in temperature of an unheated portion of the tissue mass located in a neighborhood of the heated portion; and
adjust the measured apparent change in temperature of the heated portion based at least in part on the measured apparent change in temperature of the unheated portion.
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22. A system for monitoring a change in temperature of a heated portion of a tissue mass using magnetic resonance imaging techniques, the system configured to:
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measure an apparent temperature change of each of a plurality of unheated portions of the tissue mass located in a neighborhood of the heated portion;
measure an apparent temperature change of the heated portion; and
adjust the measured apparent change in temperature of the heated portion based at least in part on the measured apparent change in temperatures of the unheated portions. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system for determining a temperature of a heated portion of a tissue mass using magnetic imaging techniques, the system configured to:
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measure an apparent temperature change of each of a plurality of unheated portions of the mass located in a neighborhood of the heated portion;
determine a characteristic of a bias temperature field based on the measured apparent temperature changes of the plurality of unheated portions;
measure an apparent temperature change of the heated portion;
calculate a bias temperature change value corresponding the position of the heated portion based on the determined bias temperature field characteristic; and
adjust the temperature change measurement of the heated portion based on the calculated bias temperature change value. - View Dependent Claims (33, 34)
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Specification