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Abstract #2753

Simple and Accurate Determination and Visualization of True Quadrature Settngs on Commercial Multiple Channel Transmitters Using Anti-Quad

Steven M. Wright1, Ivan E. Dimitrov2, 3, Sergey Cheshkov2, Mary P. McDougall4, Craig R. Malloy2

1Electrical and Computer Engineering, Texas A&M University, College Station, TX, United States; 2Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, United States; 3Philips Medical Systems, Cleveland, OH, United States; 4Biomedical Engineering, Texas A&M University, College Station, TX, United States

In addition to B1 homogeneity, searching for the most efficient (true quadrature) B1+ is desirable for a number of applications, especially those that require high power, e.g. proton decoupled spectroscopy. This abstract discusses a simple method for calibration of the drive phases in a two channel transmit system. Setting the phases for reverse circular polarization (anti-quad) provides greater sensitivity for the validation of the phase calibration for steering to a point of interest. In addition to its general applicability for coil calibration, this method may find application in steering the zero effective field needed for catheter-tracking based on reverse polarization.

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Keywords

accurate achieve achieved addition additionally adjusted adjustment advanced agreement allows amplitude anti applicability application applications appropriate behavior biomedical body bottom breast broad calibrating calibration catheter channel channels circular coil coils college column combination combiner commercial computer confidence confirm confirms create decoupled described designed desirable desired determination determine development discusses drive dual easily edge effective efficient either electrical element enables engineering especially exciting experimental fails field fields frame fully function general good greater highest homogeneity illustrated illustrates illustrating individual inherent inhomogeneity inspection knowledge magnitude makes maps marker medical mode multichannel narrow needed normalized null opposed optimal overall pair paths peak phantom plots polarization power prevent previously principle produced profile propagation proper providing quad quadrature quick receiver require requires reverse running saddle sensitive sensitivity settings sharp simple software southwestern spectroscopy station steered steering subtraction system systems tracking transmit transmitters true useful usefulness validation vendor verify verifying visual visualization voltages whole wright yellow zero