Theory of the quadrature elliptic birdcage coil Export

@article{BirdcageTheory, abstract = {This paper presents the theory of the quadrature birdcage coil wound on an elliptic cylindrical former. A conformal transformation of the ellipse to a circular geometry is used to derive the optimal sampling of the continuous surface current distribution to produce uniform magnetic fields within an elliptic cylinder. The analysis is rigorous for ellipses of any aspect ratio and shows how to produce quadrature operation of the elliptic birdcage with a conventional hybrid combiner. Insight gained from the transformation is also used to analyze field homogeneity, find the optimal RF shield shape, and specify component values to produce the correct current distribution in practice. Measurements and images from a 16-leg elliptic birdcage coil at both low and high frequencies show good quadrature performance, homogeneity, and sensitivity.}, address = {Varian Associates, 3120 Hansen Way, D-317, Palo Alto, California}, author = {Leifer, Mark C.}, citeulike-article-id = {3290471}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/mrm.1910380508}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/112213496/ABSTRACT}, doi = {10.1002/mrm.1910380508}, journal = {Magnetic Resonance in Medicine}, keywords = {coil, mrm, rf, theory}, number = {5}, pages = {726--732}, posted-at = {2008-09-18 21:19:18}, priority = {4}, title = {Theory of the quadrature elliptic birdcage coil}, url = {http://dx.doi.org/10.1002/mrm.1910380508}, volume = {38}, year = {1997} }

TY - JOUR ID - BirdcageTheory L3 - citeulike-article-id:3290471 N2 - This paper presents the theory of the quadrature birdcage coil wound on an elliptic cylindrical former. A conformal transformation of the ellipse to a circular geometry is used to derive the optimal sampling of the continuous surface current distribution to produce uniform magnetic fields within an elliptic cylinder. The analysis is rigorous for ellipses of any aspect ratio and shows how to produce quadrature operation of the elliptic birdcage with a conventional hybrid combiner. Insight gained from the transformation is also used to analyze field homogeneity, find the optimal RF shield shape, and specify component values to produce the correct current distribution in practice. Measurements and images from a 16-leg elliptic birdcage coil at both low and high frequencies show good quadrature performance, homogeneity, and sensitivity. IS - 5 JF - Magnetic Resonance in Medicine AD - Varian Associates, 3120 Hansen Way, D-317, Palo Alto, California EP - 732 TI - Theory of the quadrature elliptic birdcage coil VL - 38 SP - 726 KW - coil KW - mrm KW - rf KW - theory AU - Leifer, Mark PY - 1997/// UR - http://dx.doi.org/10.1002/mrm.1910380508 ER -