TY - JOUR
T1 - Efficiency evaluation of a 13C Magnetic Resonance birdcage coil: Theory and comparison of four methods
AU - Giovannetti, Giulio
AU - Frijia, Francesca
AU - Hartwig, Valentina
AU - Menichetti, Luca
AU - Ardenkjaer-Larsen, Jan Henrik
AU - Marchi, Daniele De
AU - Positano, Vincenzo
AU - Landini, Luigi
AU - Lombardi, Massimo
AU - Santarelli, Maria Filomena
PY - 2013
Y1 - 2013
N2 - Radiofrequency coils in Magnetic Resonance systems are used to produce a homogeneous B1 field for exciting the nuclei and to pick up the signals emitted by the nuclei with high signal-to-noise ratio. Accordingly, coil performance affects strongly the quality of the obtained data and images.Coil efficiency, defined as the B1 magnetic field induced at a given point on the square root of supplied power P, is an important parameter that characterizes coil performance, since by maximizing efficiency will also maximize the signal-to-noise ratio.This work describes and compares four methods for coil efficiency estimation, based on different theoretical approaches. Three methods allow efficiency measurement by using “probe techniques” (perturbing loop, perturbing sphere and pick-up coil), which can be used both on the bench and inside the scanner, while an “NMR technique” has been employed for comparison purpose.Methods were tested on a 13C birdcage coil tuned at 32.13MHz.
AB - Radiofrequency coils in Magnetic Resonance systems are used to produce a homogeneous B1 field for exciting the nuclei and to pick up the signals emitted by the nuclei with high signal-to-noise ratio. Accordingly, coil performance affects strongly the quality of the obtained data and images.Coil efficiency, defined as the B1 magnetic field induced at a given point on the square root of supplied power P, is an important parameter that characterizes coil performance, since by maximizing efficiency will also maximize the signal-to-noise ratio.This work describes and compares four methods for coil efficiency estimation, based on different theoretical approaches. Three methods allow efficiency measurement by using “probe techniques” (perturbing loop, perturbing sphere and pick-up coil), which can be used both on the bench and inside the scanner, while an “NMR technique” has been employed for comparison purpose.Methods were tested on a 13C birdcage coil tuned at 32.13MHz.
KW - Magnetic Resonance
KW - Radiofrequency coils
KW - Coil efficiency
U2 - 10.1016/j.measurement.2013.03.015
DO - 10.1016/j.measurement.2013.03.015
M3 - Journal article
SN - 0263-2241
VL - 46
SP - 2201
EP - 2205
JO - Measurement: Journal of the International Measurement Confederation
JF - Measurement: Journal of the International Measurement Confederation
IS - 7
ER -