Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Sören Johst"'
Autor:
Stephan Orzada, Klaus Solbach, Marcel Gratz, Sascha Brunheim, Thomas M Fiedler, Sören Johst, Andreas K Bitz, Samaneh Shooshtary, Ashraf Abuelhaija, Maximilian N Voelker, Stefan H G Rietsch, Oliver Kraff, Stefan Maderwald, Martina Flöser, Mark Oehmigen, Harald H Quick, Mark E Ladd
Publikováno v:
PLoS ONE, Vol 14, Iss 9, p e0222452 (2019)
PurposeA 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.MethodsThe add-on system consists of a large number of hardware components, including modulators,
Externí odkaz:
https://doaj.org/article/96d260877d3d427493ea3fe92a1182c9
Autor:
Stephan Orzada, Andreas K. Bitz, Sören Johst, Marcel Gratz, Maximilian N. Völker, Oliver Kraff, Ashraf Abuelhaija, Thomas M. Fiedler, Klaus Solbach, Harald H. Quick, Mark E. Ladd
Publikováno v:
Frontiers in Physics, Vol 5 (2017)
Object: In this work an 8-channel array integrated into the gap between the gradient coil and bore liner of a 7-Tesla whole-body magnet is presented that would allow a workflow closer to that of systems at lower magnetic fields that have a built-in b
Externí odkaz:
https://doaj.org/article/1d05c7d0321f4b5ea62fc78aaf5e59ec
Publikováno v:
PLoS ONE, Vol 10, Iss 3, p e0119845 (2015)
When performing non-enhanced time-of-flight MR angiography of the lower extremity arteries at 7 T with cardiac triggering, the acquisition time is a crucial consideration. Therefore, in previous studies, saturation RF pulses were applied only every s
Externí odkaz:
https://doaj.org/article/ca68137e76c6445c93a300711806690b
Autor:
Sören Johst, Stephan Orzada, Anja Fischer, Lena C Schäfer, Kai Nassenstein, Lale Umutlu, Thomas C Lauenstein, Mark E Ladd, Stefan Maderwald
Publikováno v:
PLoS ONE, Vol 9, Iss 1, p e86274 (2014)
In this study three sequences for non-contrast-enhanced MRA of the lower extremity arteries at 7T were compared. Cardiac triggering was used with the aim to reduce signal variations in the arteries. Two fast single-shot 2D sequences, a modified Ultra
Externí odkaz:
https://doaj.org/article/08c813ff15034a79a9b8f447c23a2cc3
Autor:
Karsten H Wrede, Sören Johst, Philipp Dammann, Neriman Özkan, Christoph Mönninghoff, Markus Kraemer, Stefan Maderwald, Mark E Ladd, Ulrich Sure, Lale Umutlu, Marc Schlamann
Publikováno v:
PLoS ONE, Vol 9, Iss 9, p e106697 (2014)
PURPOSE: Conventional saturation pulses cannot be used for 7 Tesla ultra-high-resolution time-of-flight magnetic resonance angiography (TOF MRA) due to specific absorption rate (SAR) limitations. We overcome these limitations by utilizing low flip an
Externí odkaz:
https://doaj.org/article/d7a074abdb9a467e810db4d02c13662c
Autor:
Karsten H Wrede, Philipp Dammann, Christoph Mönninghoff, Sören Johst, Stefan Maderwald, I Erol Sandalcioglu, Oliver Müller, Neriman Özkan, Mark E Ladd, Michael Forsting, Marc U Schlamann, Ulrich Sure, Lale Umutlu
Publikováno v:
PLoS ONE, Vol 9, Iss 1, p e84562 (2014)
PURPOSE: To prospectively evaluate 7 Tesla time-of-flight (TOF) magnetic resonance angiography (MRA) in comparison to 1.5 Tesla TOF MRA and 7 Tesla non-contrast enhanced magnetization-prepared rapid acquisition gradient-echo (MPRAGE) for delineation
Externí odkaz:
https://doaj.org/article/a0a4fcbfa94a4f799835b7115964b60a
Publikováno v:
Nuclear Technology. 207:352-362
This paper presents the approach of extending a classical generic event tree (ET) of a Level 2 Probabilistic Safety Analysis to the results of a probabilistic dynamic safety analysis. The example o...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c9d4c00474bdb662f1e53769f3b8ca1
https://doi.org/10.1080/00295450.2020.1766347
https://doi.org/10.1080/00295450.2020.1766347
Autor:
Sören Johst, Michael Hage
Publikováno v:
Proceedings of the 30th European Safety and Reliability Conference and 15th Probabilistic Safety Assessment and Management Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6b10d79cd9698e583af51ae61290665
https://doi.org/10.3850/978-981-14-8593-0_4720-cd
https://doi.org/10.3850/978-981-14-8593-0_4720-cd
Autor:
Michael Hage, Sören Johst
Publikováno v:
Proceedings of the 30th European Safety and Reliability Conference and 15th Probabilistic Safety Assessment and Management Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98dad15b96bd7f30438196eef89a230a
https://doi.org/10.3850/978-981-14-8593-0_4741-cd
https://doi.org/10.3850/978-981-14-8593-0_4741-cd
Autor:
Thomas Fiedler, Harald H. Quick, Sascha Brunheim, Marcel Gratz, Sören Johst, Andreas K. Bitz, Stephan Orzada, Mark E. Ladd
Publikováno v:
Magnetic Resonance in Medicine. 79:2652-2664
Purpose Current methods for mitigation of transmit field B1+ inhomogeneities at ultrahigh field (UHF) MRI by multi-channel radiofrequency (RF) shimming rely on accurate B1+ mapping. This can be time consuming when many RF channels have to be mapped f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4fd7379331e5031cf3c73820fff21194
https://doi.org/10.1002/mrm.26925
https://doi.org/10.1002/mrm.26925