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A quadrature coil for the adult human head

1986; Elsevier BV; Volume: 69; Issue: 2 Linguagem: Inglês

10.1016/0022-2364(86)90075-2

1557-8968

Victor J. Sank, C‐N. Chen, D. I. Hoult,

NMR spectroscopy and applications

A quadrature head coil suitable for NMR imaging up to 80 MHz is described. Based on the well known design of Alderman and Grant, the four-quadrant coil has the attributes of distributed tuning capacitance and electrostatic guard rings, while maintaining the √2 improvement in sensitivity and. √2 improvement in effective B1 inherent in the quadrature design. The appropriate phase shifts for transmission and reception are generated with the aid of a coaxial cable ring hybrid, which is simple in design and affords a considerable degree of isolation between transmitter and receiver.