An analytic method to predict the thermal map of cryosurgery iceballs in MR images

This paper presents a newly developed method to estimate, in magnetic resonance (MR) images, the temperatures reached within the volume of an iceball produced by a cryogenic probe. Building on the direct measurements of the MR signal intensity and its correlation with independent temperature variati...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 2004-01, Vol.23 (1), p.122-129
Main Authors: Fournial, R., Traore, A.S., Laurendeau, D., Moisan, C.
Format: Article
Language:English
Subjects:
Algorithms
Animals
Body Temperature
Cryogenic temperature
Cryogenics
Cryosurgery - methods
Estimates
Human health and pathology
Ice
Image analysis
Image Interpretation, Computer-Assisted - methods
In Vitro Techniques
Life Sciences
Liquids
Liver
Liver - physiopathology
Liver - surgery
Magnetic analysis
Magnetic resonance
Magnetic Resonance Imaging - instrumentation
Magnetic Resonance Imaging - methods
Mathematical analysis
Medical imaging
Phantoms, Imaging
Phase measurement
Probes
Reproducibility of Results
Sensitivity and Specificity
Solids
Surgery, Computer-Assisted - methods
Swine
Temperature distribution
Temperature sensors
Thermography - instrumentation
Thermography - methods
Time series
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Summary:This paper presents a newly developed method to estimate, in magnetic resonance (MR) images, the temperatures reached within the volume of an iceball produced by a cryogenic probe. Building on the direct measurements of the MR signal intensity and its correlation with independent temperature variations at the phase transition from liquid to solid, the thermal information embedded in the images was accessed. The volume and diameter of the growing iceball were estimated from a time series of MR images. Using regressions over the volume in the time and thermal domains, this method predicted the cryogenic temperatures beyond the range of sensitivity of the MR signal itself. We present a validation of this method in samples of gelatin and ex vivo pig liver. Temperature predictions are shown to agree with independent thermosensor readings over a range extending from 20/spl deg/C down to -65/spl deg/C, with an average error of less than 6/spl deg/C.
ISSN:0278-0062
1558-254X
DOI:10.1109/TMI.2003.819919