KEYWORDS: Signal to noise ratio, Image registration, Data acquisition, Magnetic resonance imaging, Kidney, Liver, Solids, Rigid registration, Motion measurement, Tissues
Breathing motion causes severe artifacts in Magnetic Resonance Imaging (MRI), which are usually avoided using either
breath-holding during the acquisition or gating or triggering techniques while the patient is breathing freely. In MRI with
continuously moving table the patient is moved through the magnet during the data acquisition, thereby allowing for time
efficient coverage of arbitrary large body regions. Due to the continuous table motion standard breathing motion
compensation techniques are not applicable here. In this work a retrospective compensation technique for abdominal
breathing motion in moving table MRI is proposed, which reconstructs artifact free images from data acquired during
free breathing. For each slice position multiple motion consistent snapshots of arbitrary breathing states are acquired and
subsequently combined consistently using a combination of rigid and deformable slice-to-volume registration. Typical
breathing motion induced artifacts such as ghosting, blurring or misalignments of organs occurring if data from different
breathing states is inconsistently combined are avoided. The proposed method significantly extends a previous approach
which aimed only at the suppression of ghosting artifacts in MRI with continuously moving table.
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