Ultrashort echo time MRI of cortical bone at 7 tesla field strength: A feasibility study

Autor: Chunsheng Wang, Andrew J. Burghardt, Roland Krug, Sharmila Majumdar, Daniel B. Vigneron, Douglas A.C. Kelley, Xiaoliang Zhang, Thomas M. Link, Peder E. Z. Larson
Rok vydání: 2011
Předmět:
Zdroj: Journal of Magnetic Resonance Imaging. 34:691-695
ISSN: 1053-1807
DOI: 10.1002/jmri.22648
Popis: Purpose—To implement and examine the feasibility of a 3D ultra-short TE (UTE) sequence on a 7T clinical MR scanner in comparison with 3T MRI at high isotropic resolution. Materials and Methods—Using an in-house built saddle coil at both field strengths we have imaged mid-diaphysial sections of five fresh cadaveric specimen of the distal tibia. An additional in vivo scan was performed at 7 Tesla using a quadrature knee coil. Results—Using the same type of saddle coil at both field strengths a significant increase in SNR at 7T compared to 3T (factor 1.7) was found. Significantly shorter T2* values were found at the higher field strength (T2*=552.2±126µs at 7T versus T2*=1163±391µs at 3T). Conclusions—UHF MRI at 7T has great potential for imaging tissues with short T2.
Databáze: OpenAIRE
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