Abstract #2362
Temperature map reconstruction directly from k-space with compensation for heating-induced geometric distortions
Pooja Gaur 1,2 and William A Grissom 2,3
1
Chemical and Physical Biology, Vanderbilt
University, Nashville, Tennessee, United States,
2
Institute
of Imaging Science, Vanderbilt University, Nashville,
Tennessee, United States,
3
Biomedical
Engineering, Vanderbilt University, Nashville,
Tennessee, United States
A temperature reconstruction algorithm that compensates
for chemical-shift distortions that result from heating
is presented for proton resonance frequency-shift
thermometry. A hybrid multibaseline and referenceless
temperature change model is fit directly to k-space data
and iteratively updated to determine the heating-induced
phase shift at the echo time while compensating for
off-resonance phase accrual throughout the readout. The
method is evaluated in simulation and phantom
experiments. It is able to correctly reconstruct the
simulated temperature and has a large impact on thermal
dose measurements.
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