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Abstract #0428

Detunable Transmit Array & Flexible Receive Array for 7T Shoulder Imaging

SUMMA25Ryan Brown1, Bei Zhang1, Cem M. Deniz1, 2, Gene Young Cho1, 2, Cornel Stefanescu1, Shumin Wang3, Daniel K. Sodickson1, Graham C. Wiggins1

1Radiology, New York University School of Medicine, New York, NY, United States; 2Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY, United States; 3MRI Research Center, Auburn University, Auburn University, AL, United States

Musculoskeletal imaging is becoming a fruitful application at 7T, particularly for the knee and other extremities. Design of a 7T coil for shoulder imaging is more challenging due to the inability to surround the shoulder with a birdcage and the challenges of RF inhomogeneity. A 7T shoulder coil was constructed with a flexible detunable 8 element loop array for transmit and a 10 element flexible domed receive array. Applying birdcage-like phase to the transmit elements produced a serviceable transmit excitation, and SNR gains in deep cartilage of better than 2-fold were obtained compared to 3T.

Keywords

accommodate accommodation achieve active adequate afforded allow allowed alterations among amplitude approved approximately array arrowhead asymmetric auburn azimuthal birdcage board body bottom calibrated cartilage challenges channel circuit close coil coils commercial consent constructed convenient coverage custom deep density dependent design designed designers detuning developed diameter dielectric differ diodes disregarded distributed domed dropout eight either elements encircling etched excitation fiberglass field fields fitting flexible formers furthest gains geometries geometry graduate greater hexagonal hinge improvement in vivo institute knee largely like loaded local location makes manner maps matched medicine mind mitigated model nearest needed neighbor neighboring next noted objectives overlapping panels part partially pentagonal periphery phantom photograph pixel poses propagation properties proton radiology receive rectangular reduced relationship replicate requirements restriction rigid sample scanner school selected shape shim shoulder simplify steps structures subject subjects substantial successful sufficient suitable superficial symmetric symmetries tailored tight tightly transmit trio tuned twisting unfeasible uniformity unique variety volunteers wide written young