Quarles & Brady, LLP
Correction of artifacts caused by Maxwell terms in phase contrast angiography
 A method is presented for correcting Maxwell term error artifacts produced by an NMR system during the production of either a phase contrast angiogram or a complex difference angiogram. Phase corrections are made to the reconstructed phase image to eliminate the artifacts. Correction coefficients calculated from the flow encoding magnetic gradient waveforms of the phase contrast pulse sequence are used in a polynomial to calculate a set of phase error corrections. These corrections are then used to adjust the phase at each pixel of the angiogram image. 
General Electric Company
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G01R G01R
inventional inventional
Xiaohang Gary H. Kevin F. Jason A. Norbert J. Alexander Matthew A.
Zhou Glover King Polzin Pelc Ganin Bernstein