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Abstract #0903

Decoupling Low Field Array Coil Using High Impedance Preamplifier

Chenhao Sun1, Anja Samardzija2, Yonghyun Ha1, Ryan Gross1, Terence W. Nixon1, Scott McIntyre1, Heng Sun2, Flor Parra2, Gigi Galiana1,2, and R. Todd Constable1,2
1Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, United States, 2Department of Biomedical Engineering, Yale University, New Haven, CT, United States

Synopsis

Keywords: Low-Field MRI, RF Arrays & Systems, Low Field

Motivation: Phased array coils can benefit low field MRI via higher SNR or parallel imaging. However, isolation preamplifiers at very low frequency are difficult to source, and the bandwidth of LC resonance circuits at very low frequency can be narrow.

Goal(s): To investigate a different approach to array coil decoupling at low field.

Approach: Instead of using an LC network with low Z preamplifier, a high Z preamplifier with RF transformer can be directly used to decouple array coils.

Results: More than 20dB coil decoupling over a bandwidth of 1MHz was achieved around a readout frequency of 1MHz.

Impact: A simple and efficient method to decoupling array coil at low field is investigated in this work. Without the need of complicated matching and customize-built isolation preamplifier, broadband and sufficient decoupling on array element can be achieved.

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