Approaching ultimate intrinsic signal-to-noise ratio with loop and dipole antennas.

ABSTRACT:

Purpose

Previous work with body-size objects suggested that loops are optimal MR detectors at low fields, whereas electric dipoles are required to maximize signal-to-noise ratio (SNR) at ultrahigh fields ( ≥ 7 T). Here we investigated how many loops and/or dipoles are needed to approach the ultimate intrinsic SNR (UISNR) at various field strengths.

Methods

We calculated the UISNR inside dielectric cylinders mimicking different anatomical regions. We assessed the performance of various arrays with respect to the UISNR. We validated our results by comparing simulated and experimental coil performance maps.

Results

Arrays with an increasing number of loops can rapidly approach the UISNR at fields up to 3 T, but are suboptimal at ultrahigh fields for body-size objects. Th

SUBMITTER: Lattanzi R 

PROVIDER: S-EPMC5754268 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature