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.
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).
UHF MRI at 7T has great potential for imaging tissues with short T2.
Keywords: Seven Tesla, Ultra-short MRI, Cortical Bone