Magnetic resonance imaging of frozen tissues: Temperature-dependent MR signal characteristics and relevance for MR monitoring of cryosurgery
✍ Scribed by Bruce L. Daniel; Kim Butts; Walter F. Block
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 88 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Previously, the magnetic resonance (MR) imaging appearance of frozen tissues created during cryosurgery has been described as a signal void. In this work, very short echo times (1.2 msec) allowed MR signals from frozen tissues to be measured at temperatures down to ؊35°C. Ex vivo bovine liver, muscle, adipose tissue, and water were imaged at steady-state temperatures from ؊78°to ؉6°C. Signal intensity, T2*, and T1 were measured using gradient-echo imaging. Signal intensity and T2* decrease monotonically with temperature. In the future, these MR parameters may be useful for mapping temperatures during cryosur-