RF manipulation M. E. Ladd

Our research group develops methods and technologies to enable 7 Tesla examinations throughout the body including the torso. Part of the group is located at the Erwin L. Hahn Institute (ELH) in Essen and part at the German Cancer Research Center (DKFZ) in Heidelberg.

Our work is in particular focused on:

  1. multi-channel transmit coils,
  2. numerical simulations in inhomogeneous human body models to investigate B1 and SAR patterns, also in the presence of electrically-conducting implants, and
  3. excitation strategies to homogenize the transmit B1 field or perform spatially selective excitation/saturation.

As part of the DFG-funded German Ultrahigh Field Imaging (GUFI) project, we are working to establish quality assurance standards for ultra-high-field imaging. A 32-channel parallel transmission system is under development as part of a collaboration between ELH in Essen, DKFZ in Heidelberg, and High-Frequency Engineering in Duisburg (Prof. Solbach); this work is funded by the European Research Council through the Advanced Grant “MRexcite”. We work closely with other groups at the ELH, including Dagmar Timmann on cerebellar imaging, Tom Scheenen on prostate imaging, and Harald Quick on RF technology.

Excitation of "ELH" in a cylindrical phantom using a spatially selective RF pulse.
Axial and coronal sections acquired in the abdomen with an integrated 8-channel RF array (below).
8-channel RF array integrated into the 7 Tesla system by placing it on the bore Iiner. The array can be used to excite any region of the body, similar to conventional body coils found in clinical MRI systems.
Human head model with three metallic cranial fixation plates (left, yellow arrows). Specific absorption rate (middle) and temperature simulations (right) verify that no significant heating is expected during a head examination at 7 Tesla.
 
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