Title :
Effects of end ring configuration on homogeneity and signal to noise ratio in a birdcage coil loaded with the human head
Author :
Liu, Wanzhan ; Collins, Christopher M. ; Smith, Michael B.
Author_Institution :
Dept. of Radiol., Pennsylvania State Univ. Coll. of Medicine, Hershey, PA, USA
Abstract :
Four different end ring configurations of a birdcage coil were numerically modeled to examine their effects on homogeneity and signal to noise ratio (SNR) in the coil at 64 MHz. The end ring configuration with the best homogeneity in the empty coil produces the least homogeneous B1 field when the coil is loaded with a human head. The coil configuration that results in the best homogeneity in the loaded birdcage also has the highest SNR
Keywords :
biomedical MRI; biomedical equipment; coils; eddy currents; finite difference time-domain analysis; magnetic shielding; 64 MHz; FDTD method; birdcage coil; continuous inward annular extensions; cylindrical shield; eddy currents; end ring configuration effect; homogeneity; human head loaded coil; normalization factor; reconstructed gradient echo image; shield current return paths; signal to noise ratio; steady state RF fields; Coils; Educational institutions; Finite difference methods; Head; Humans; Joining processes; Radio frequency; Signal to noise ratio; Voltage; Wires;
Conference_Titel :
Bioengineering Conference, 2002. Proceedings of the IEEE 28th Annual Northeast
Conference_Location :
Philadelphia, PA
Print_ISBN :
0-7803-7419-3
DOI :
10.1109/NEBC.2002.999440
