000K  utf8
1100  2019$c2019-09-12
1500  eng
2050  urn:nbn:de:hbz:464-20191031-085157-2
2051  10.1371/journal.pone.0222452
3000  Orzada, Stephan
3010  Abuelhaija, Ashraf
3010  Bitz, Andreas K.
3010  Brunheim, Sascha
3010  Fiedler, Thomas M.
3010  Flöser, Martina
3010  Gratz, Marcel
3010  Johst, Sören
3010  Kraff, Oliver
3010  Ladd, Mark E.
3010  Maderwald, Stefan
3010  Oehmigen, Mark
3010  Quick, Harald H.
3010  Rietsch, Stefan H. G.
3010  Shooshtary, Samaneh
3010  Solbach, Klaus
3010  Voelker, Maximilian N.
4000  32-channel parallel transmit system add-on for 7T MRI  [Orzada, Stephan]
4209  Purpose A 32-channel parallel transmit (pTx) add-on for 7 Tesla whole-body imaging is presented. First results are shown for phantom and in-vivo imaging. Methods The add-on system consists of a large number of hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, a control computer, and an integrated 32-channel transmit/receive body array. B1+ maps in a phantom as well as B1+ maps and structural images in large volunteers are acquired to demonstrate the functionality of the system. EM simulations are used to ensure safe operation. Results Good agreement between simulation and experiment is shown. Phantom and in-vivo acquisitions show a field of view of up to 50 cm in z-direction. Selective excitation with 100 kHz sampling rate is possible. The add-on system does not affect the quality of the original single-channel system. Conclusion The presented 32-channel parallel transmit system shows promising performance for ultra-high field whole-body imaging.
4950  https://doi.org/10.1371/journal.pone.0222452$xR$3Volltext$534
4950  https://nbn-resolving.org/urn:nbn:de:hbz:464-20191031-085157-2$xR$3Volltext$534
4961  https://duepublico2.uni-due.de/receive/duepublico_mods_00070688
5051  610