Siemens Medical Solutions Usa, Inc.

The United States of America, As Represented by the Secretary, Department of Health and Human Services

Renate Jerecic

Sven Zuehlsdorff

Peter Weale

Andreas Greiser

Peter Schmitt

Xiaoming Bi

Peter Kellman

Saurabh Shah

A system enhances MR imaging contrast between vessels containing dynamically flowing blood and static tissue using an MR imaging system. The MR imaging system, in response to a heart rate synchronization signal, acquires an anatomical preparation data set representing a spatially non-localized preparation 3D volume in response to a first magnetization preparation pulse sequence. The MR imaging system acquires a spatially localized anatomical imaging data set representing a second imaging volume. The MR imaging system subtracts slice specific MR imaging data of the spatially localized anatomical imaging data set from spatially and temporally corresponding slice specific imaging data of the anatomical preparation data set to derive blood flow indicative imaging data. The temporally corresponding slice specific imaging data comprises data acquired at a substantially corresponding cycle point within a heart beat cycle determined in response to said heart rate synchronization signal. The MR imaging system iteratively repeats the subtraction step for multiple adjacent slices individually comprising a spatially localized anatomical imaging data set to provide a three-dimensional imaging data set.

Enhanced contrast MR system accommodating vessel dynamic fluid flow

An MR magnetic field inhomogeneity compensation system acquires multiple MR data sets representing luminance intensity values of individual image elements comprising corresponding multiple different image versions of at least a portion of a first imaging slice of patient anatomy including fat and water components. The compensation system employs the multiple MR data sets in solving corresponding multiple simultaneous nonlinear equations to calculate local frequency offset associated with magnetic field inhomogeneity at the individual image element location, for an individual image element of the image elements. The local frequency offset comprises a difference between proton spin frequency at the location and a nominal proton spin frequency. The compensation system derives data representing an electrical signal to be applied to magnetic field generation coils to substantially compensate for determined offset frequencies at the plurality of individual locations. A magnetic field generation coil generates a magnetic field in response to applying the electrical signal to substantially compensate for the magnetic field inhomogeneity at the individual image element location.

System for adjusting a magnetic field for MR and other use

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Shanghai, China

Renate Jerecic