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Your search keyword '"Sascha Brunheim"' showing total 4 results
Start Over Author "Sascha Brunheim" Journal magnetic resonance in medicine
4 results on '"Sascha Brunheim"'

1. An 8/15-channel Tx/Rx head neck RF coil combination with region-specific B1+ shimming for whole-brain MRI focused on the cerebellum at 7T

Author

Thomas M. Ernst, Stephan Orzada, Oliver Kraff, Harald H. Quick, Stefan H. G. Rietsch, Viktor Pfaffenrot, Peter J. Koopmans, and Sascha Brunheim

Subjects
Cerebellum, Channel (digital image), Computer science, Head neck, Rf shimming, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Nuclear magnetic resonance, medicine.anatomical_structure, Region specific, Healthy volunteers, Brain mri, medicine, Radiology, Nuclear Medicine and imaging, 030217 neurology & neurosurgery, Radiofrequency coil
Published
2018

2. Fast and accurate multi‐channel mapping based on the TIAMO technique for 7T UHF body MRI

Author

Thomas Fiedler, Harald H. Quick, Sascha Brunheim, Marcel Gratz, Sören Johst, Andreas K. Bitz, Stephan Orzada, and Mark E. Ladd

Subjects
Physics, medicine.diagnostic_test, Ultrahigh field, Acoustics, Rf shimming, Magnetic resonance imaging, Rf field, Imaging phantom, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Ultra high frequency, Electromagnetic coil, medicine, Radiology, Nuclear Medicine and imaging, 030217 neurology & neurosurgery, Multi channel
Abstract

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 for in vivo body MRI, where the B1 maps should ideally be acquired within a single breath-hold. Therefore, a new B1+ mapping technique (B1TIAMO) is proposed. Methods The performance of this technique is validated against an established method (DREAM) in phantom measurements for a cylindrical head phantom with an 8-channel transmit/receive (Tx/Rx) array. Furthermore, measurements for a 32-channel Tx/Rx remote array are conducted in a large body phantom and the |B1+| map reliability is validated against simulations of the transmit RF field distribution. Finally, in vivo results of this new mapping technique for human abdomen are presented. Results For the head phantom (8-channel Tx/Rx coil), the single |B1+| comparison between B1 TIAMO, the direct DREAM measurements, and simulation data showed good agreement with 10-19% difference. For the large body phantom (32-channel Tx/Rx coil), B1TIAMO matched the RF field simulations well. Conclusion The results demonstrate the potential to acquire 32 accurate single-channel B1+ maps for large field-of-view body imaging within only a single breath-hold of 16 s at 7T UHF MRI. Magn Reson Med 79:2652-2664, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

Published
2017

3. An 8/15-channel Tx/Rx head neck RF coil combination with region-specific B

Author

Viktor, Pfaffenrot, Sascha, Brunheim, Stefan H G, Rietsch, Peter J, Koopmans, Thomas M, Ernst, Oliver, Kraff, Stephan, Orzada, and Harald H, Quick

Subjects
Adult, Male, Radio Waves, Brain, Neuroimaging, Equipment Design, Signal-To-Noise Ratio, Magnetic Resonance Imaging, Healthy Volunteers, Cerebellum, Image Processing, Computer-Assisted, Humans, Female, Algorithms, Software
Published
2017

4. Fast and accurate multi-channel B1+ mapping based on the TIAMO technique for 7T UHF body MRI

Author

Sascha, Brunheim, Marcel, Gratz, Sören, Johst, Andreas K, Bitz, Thomas M, Fiedler, Mark E, Ladd, Harald H, Quick, and Stephan, Orzada

Subjects
Male, Phantoms, Imaging, Image Interpretation, Computer-Assisted, Humans, Reproducibility of Results, Whole Body Imaging, Equipment Design, Kidney, Head, Magnetic Resonance Imaging
Abstract

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 for in vivo body MRI, where the BThe performance of this technique is validated against an established method (DREAM) in phantom measurements for a cylindrical head phantom with an 8-channel transmit/receive (Tx/Rx) array. Furthermore, measurements for a 32-channel Tx/Rx remote array are conducted in a large body phantom and the |B1+| map reliability is validated against simulations of the transmit RF field distribution. Finally, in vivo results of this new mapping technique for human abdomen are presented.For the head phantom (8-channel Tx/Rx coil), the single |B1+| comparison between BThe results demonstrate the potential to acquire 32 accurate single-channel B1+ maps for large field-of-view body imaging within only a single breath-hold of 16 s at 7T UHF MRI. Magn Reson Med 79:2652-2664, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

Published
2017

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