Abstract #1632
Detecting signal changes in heated bone with a 3D spiral ultra-short echo time sequence
Samuel Fielden 1 , John Mugler, III 2 , Wilson Miller 2 , Kim Butts Pauly 3 , and Craig Meyer 1,2
1
Biomedical Engineering, University of
Virginia, Charlottesville, Virginia, United States,
2
Radiology,
University of Virginia, Charlottesville, Virginia,
United States,
3
Radiology,
Stanford University, Palo Alto, California, United
States
Monitoring bone heating during focused ultrasound
procedures is desirable. The popular PRF shift technique
for MR thermometry cannot be performed in bone due to
its short T2. However, T1 and T2 are temperature
dependent, and so an alternative method is to use signal
intensity changes, detected by ultra-short echo time
(UTE) sequences, as a method by which bone thermometry
can be performed. Here, we have used a rapid 3D spiral
UTE sequence to image a heated bone sample as it cools
down in the bore of the MRI and have detected signal
intensity changes consistent with T1-lengthening of
heated tissue.
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