Johannes Thomas Schneider1,2, Raffi Kalayciyan1,3, Martin Haas2, Wolfgang Ruhm1, Olaf Doessel3, Juergen Hennig2, Peter Ullmann1
1Bruker BioSpin MRI GmbH, Ettlingen, Germany; 2Dept. of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany; 3Institute of Biomedical Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany
This study presents the first experimental realization of inner-volume-imaging using three-dimensional parallel excitation of arbitrarily shaped regions of interest. By using a temporally optimized 4-fold undersampled 3D k-space trajectory consisting of concentrical shells in combination with an 8-channel transceive RF-array, 3D selective excitation of an arbitrary volume could be achieved in only 5 ms. Featuring such short durations 3D-selective pulses are now on the verge of being used in common imaging sequences and have been successfully applied in first experiments of inner-volume-imaging in phantoms and fruits during this study.