Method and magnetic resonance apparatus to acquire MR data in a predetermined three-dimensional volume segment of a subject

摘要

Acquisition of magnetic resonance (MR) data in a predetermined three-dimensional volume segment of an examination subject with an MR apparatus proceeds by the volume segment being excited with an RF excitation pulse, and repeated, temporally sequential implementation of the following in order to respectively read out an echo train:
Switch a refocusing pulse.Switch a first phase coding gradient in a first direction and a second phase coding gradient in a second direction.Switch an additional magnetic field gradient for spatial coding in a third direction which is perpendicular to the first direction and the second direction,wherein the MR data of a k-space line are read out while the additional magnetic field gradient is switched.;Every k-space line corresponds to a line of k-space that corresponds to the volume segment. At least one k-space line is read out repeatedly in a middle segment of k-space.

主权项

1. A method to acquire magnetic resonance (MR) data from a predetermined three-dimensional volume segment of an examination subject, comprising:
operating an MR data acquisition unit to radiate a radio-frequency (RF) excitation pulse that excites nuclear spins in said predetermined three-dimensional volume segment of the examination subject, and causes said nuclear spins to generate an echo train; and operating said MR data acquisition unit to repeatedly implement the following steps in chronological succession in order to read out an echo train by acquiring respective data values and entering said data values at respective points of k-space comprising k-space lines in a memory, wherein all lines in k-space correspond to said volume segment:
activate a refocusing pulse,activate a first phase coding gradient in a first direction and a second phase coding gradient in a second direction, andactivate an additional magnetic field gradient in a third direction that is perpendicular to each of said first direction and said second direction, and reading out said data values in a k-space line while said additional magnetic field gradient is activated, causing k-space points of at least one k-space line in a middle segment of k-space to be repeatedly read out.