METHOD FOR DETERMINING THE SPATIAL DISTRIBUTION OF MAGNETIC RESONANCE SIGNALS IN SUBVOLUMES OF AN OBJECT UNDER EXAMINATION

摘要

Method for determining the spatial distribution of magnetic resonance signals from at least one of N subvolumes which do not overlap, wherein a measurement sequence with coding steps is selected, wherein each coding step contains the injection of one or more spatially selective RF pulses; a reception coding scheme is predefined and determines unique spatial coding for at least one of the subvolumes but not for the entire volume under examination (UV); a transmission coding scheme is defined, wherein coding is effected via the amplitude and/or phase of the transverse magnetization, wherein the same coding as in another subvolume is not predefined at any location within each subvolume; the temporal amplitude and phase profile of the RF pulses is calculated; and, in order to carry out all coding steps, each reception coding step is carried out I times with variations according to the I transmission coding steps in the transmission coding scheme. The method according to the invention makes it possible to largely restrict the spatially resolving MR signal coding and image reconstruction to subvolumes of the object under examination without the achievable image quality sensitively depending on imperfections in the MR apparatus in this case.