In:
Magnetic Resonance in Medicine, Wiley, Vol. 47, No. 3 ( 2002-03), p. 492-498
Abstract:
A method is presented for the rapid acquisition of temperature maps derived from phase difference maps. The temperature‐dependent chemical shift coefficients (TDCSCs) of various concentrations of aqueous cobalt and dysprosium‐based compounds were measured. The largest TDCSC calculated was for 100 mM DyEDTA, which had a TDCSC of –0.09 PPM/K; 160 mM CoCl 2 had a TDCSC of –0.04 PPM/K. These temperature‐dependent chemical shifts (TDCSs) result in phase changes in the MR signal with changing temperature. Agarose phantoms were constructed with each paramagnetic metal. A fast gradient‐echo (FGRE) MR image was acquired to serve as the baseline image. A “test” MRI procedure was then performed on the phantom. Immediately afterwards, a second FGRE MR image was acquired, serving as the probing image. Proper image processing as a phase difference map between the probing image and the baseline image resulted in an image which quantitatively described the temperature increase of the phantom in response to a particular “test” imaging experiment. Applications of this technique in assessing the safety of pulse sequences and MR coils are discussed. Magn Reson Med 47:492–498, 2002. © 2002 Wiley‐Liss, Inc.
Type of Medium:
Online Resource
ISSN:
0740-3194
,
1522-2594
Language:
English
Publisher:
Wiley
Publication Date:
2002
detail.hit.zdb_id:
1493786-4
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