Method and device for phase-sensitive flow measurement by a magnetic resonance

摘要

In a method and a device for phase-sensitive flow measurement of a volume segment of an examination subject in a measurement system, the volume segment is divided into multiple partial volume segments and the following steps are executed repeatedly until the volume segment has been completely measured: movement of a table such that a center of one of the partial volume segments to be measured essentially corresponds to the isocenter of the magnetic resonance system, and implementation of the phase-sensitive flow measurement for the partial volume segment to be measured while the center of the partial volume segment essentially corresponds to the isocenter.

主权项

1. A method for phase-sensitive flow measurement of a volume segment of an examination subject by magnetic resonance imaging, comprising the steps of:
in a computerized control system that operates a magnetic resonance data acquisition unit, having an isocenter, in which an examination subject containing a volume segment from which magnetic resonance data are to be acquired is located, dividing said volume segment into a plurality of partial volume segments, each having a center, to cause a thickness of each of said partial volume segments, in a direction of a basic magnetic field generated by the data acquisition unit, to not exceed 10 cm; operating said magnetic resonance data acquisition unit from said computerized control unit to repeatedly execute the following steps for each of said partial volume segments until magnetic resonance data have been acquired from an entirety of said volume segment:
moving a table, on which the examination subject is located, through the data acquisition unit to cause the center of one of said partial volume segments, from which magnetic resonance data are to be acquired, to substantially coincide with the isocenter of the data acquisition unit,implementing a phase-sensitive flow measurement, in which gradient magnetic fields are activated, in order to acquire phase-sensitive magnetic resonance data representing a flow of nuclear spins in said examination volume from an entirety of said one of said partial volume segments while movement of said table is temporarily ceased in order to maintain said center of said one of said partial volume segments substantially coincident with the isocenter of the data acquisition unit during acquisition of all of said magnetic resonance data from said entirety of said one of said partial volume segments, andsaid thickness of each of said partial volume segments not exceeding 10 cm reducing, when said center of said one of said partial volume segments is substantially coincident with the isocenter of the data acquisition unit, effects of any non-linearities of said gradient magnetic fields, and any eddy currents produced by said gradient magnetic fields, on the acquired magnetic resonance data.