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.