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Brunheim S, Gratz M, Johst S, Bitz AK, Fiedler TM, Ladd ME, Quick HH, Orzada S. Erratum to: Fast and accurate multi-channel B1+ mapping based on the TIAMO technique for 7 Tesla UHF body MRI (Magn Reson Med 2018;79:2652-2664). Magn Reson Med 2024; 91:1735. [PMID: 38073053 DOI: 10.1002/mrm.29868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Affiliation(s)
- S Brunheim
- MR Physics, German Center for Neurodegenerative Diseases (DZNE) within the Helmholtz Association, Bonn, Germany
| | - M Gratz
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany
- High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - S Johst
- Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Cologne, Germany
| | - A K Bitz
- Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, FH Aachen - University of Applied Sciences, Aachen, Germany
| | - T M Fiedler
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - M E Ladd
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - H H Quick
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany
- High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - S Orzada
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
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2
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Orzada S, Solbach K, Gratz M, Brunheim S, Fiedler TM, Johst S, Bitz AK, Shooshtary S, Abuelhaija A, Voelker MN, Rietsch SHG, Kraff O, Maderwald S, Flöser M, Oehmigen M, Quick HH, Ladd ME. A 32-channel parallel transmit system add-on for 7T MRI. PLoS One 2019; 14:e0222452. [PMID: 31513637 PMCID: PMC6742215 DOI: 10.1371/journal.pone.0222452] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 08/29/2019] [Indexed: 02/07/2023] Open
Abstract
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.
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Affiliation(s)
- Stephan Orzada
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- * E-mail:
| | - Klaus Solbach
- RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany
| | - Marcel Gratz
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Sascha Brunheim
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Thomas M. Fiedler
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Sören Johst
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
| | - Andreas K. Bitz
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, FH Aachen – University of Applied Sciences, Aachen, Germany
| | - Samaneh Shooshtary
- RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany
| | - Ashraf Abuelhaija
- RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany
| | - Maximilian N. Voelker
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Stefan H. G. Rietsch
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Oliver Kraff
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
| | - Stefan Maderwald
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
| | - Martina Flöser
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Mark Oehmigen
- High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Harald H. Quick
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Mark E. Ladd
- Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Faculty of Physics and Astronomy and Faculty of Medicine, University of Heidelberg, Heidelberg, Germany
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Philips BWJ, Stijns RCH, Rietsch SHG, Brunheim S, Barentsz JO, Fortuin AS, Quick HH, Orzada S, Maas MC, Scheenen TWJ. USPIO-enhanced MRI of pelvic lymph nodes at 7-T: preliminary experience. Eur Radiol 2019; 29:6529-6538. [PMID: 31201525 PMCID: PMC6828641 DOI: 10.1007/s00330-019-06277-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 04/16/2019] [Accepted: 05/17/2019] [Indexed: 02/06/2023]
Abstract
Purpose To evaluate the technical feasibility of high-resolution USPIO-enhanced magnetic resonance imaging of pelvic lymph nodes (LNs) at ultrahigh magnetic field strength. Materials and methods The ethics review board approved this study and written informed consent was obtained from all patients. Three patients with rectal cancer and three selected patients with (recurrent) prostate cancer were examined at 7-T 24–36 h after intravenous ferumoxtran-10 administration; rectal cancer patients also received a 3-T MRI. Pelvic LN imaging was performed using the TIAMO technique in combination with water-selective multi-GRE imaging and lipid-selective GRE imaging with a spatial resolution of 0.66 × 0.66 × 0.66mm3. T2*-weighted images of the water-selective imaging were computed from the multi-GRE images at TE = 0, 8, and 14 ms and used for the assessment of USPIO uptake. Results High-resolution 7-T MR gradient-echo imaging was obtained robustly in all patients without suffering from RF-related signal voids. USPIO signal decay in LNs was visualized using computed TE imaging at TE = 8 ms and an R2* map derived from water-selective imaging. Anatomically, LNs were identified on a combined reading of computed TE = 0 ms images from water-selective scans and images from lipid-selective scans. A range of 3–48 LNs without USPIO signal decay was found per patient. These LNs showed high signal intensity on computed TE = 8 and 14 ms imaging and low R2* (corresponding to high T2*) values on the R2* map. Conclusion USPIO-enhanced MRI of the pelvis at 7-T is technically feasible and offers opportunities for detecting USPIO uptake in normal-sized LNs, due to its high intrinsic signal-to-noise ratio and spatial resolution. Key Points • USPIO-enhanced MRI at 7-T can indicate USPIO uptake in lymph nodes based on computed TE images. • Our method promises a high spatial resolution for pelvic lymph node imaging.
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Affiliation(s)
- Bart W J Philips
- Department of Radiology and Nuclear Medicine (766), Radboud University Medical Center, P.O. Box 9101, Nijmegen, The Netherlands.
| | - Rutger C H Stijns
- Department of Radiology and Nuclear Medicine (766), Radboud University Medical Center, P.O. Box 9101, Nijmegen, The Netherlands
| | - Stefan H G Rietsch
- Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, 45141, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
| | - Sascha Brunheim
- Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, 45141, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
| | - Jelle O Barentsz
- Department of Radiology and Nuclear Medicine (766), Radboud University Medical Center, P.O. Box 9101, Nijmegen, The Netherlands
| | - Ansje S Fortuin
- Department of Radiology and Nuclear Medicine (766), Radboud University Medical Center, P.O. Box 9101, Nijmegen, The Netherlands.,Department of Radiology, Ziekenhuis Gelderse Vallei, Ede, The Netherlands
| | - Harald H Quick
- Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, 45141, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
| | - Stephan Orzada
- Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, 45141, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
| | - Marnix C Maas
- Department of Radiology and Nuclear Medicine (766), Radboud University Medical Center, P.O. Box 9101, Nijmegen, The Netherlands
| | - Tom W J Scheenen
- Department of Radiology and Nuclear Medicine (766), Radboud University Medical Center, P.O. Box 9101, Nijmegen, The Netherlands.,Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, 45141, Essen, Germany
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Rietsch SHG, Brunheim S, Orzada S, Voelker MN, Maderwald S, Bitz AK, Gratz M, Ladd ME, Quick HH. Development and evaluation of a 16-channel receive-only RF coil to improve 7T ultra-high field body MRI with focus on the spine. Magn Reson Med 2019; 82:796-810. [PMID: 30924181 DOI: 10.1002/mrm.27731] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/02/2019] [Accepted: 01/27/2019] [Indexed: 12/21/2022]
Abstract
PURPOSE A 16-channel receive (16Rx) radiofrequency (RF) array for 7T ultra-high field body MR imaging is presented. The coil is evaluated in conjunction with a 16-channel transmit/receive (16TxRx) coil and additionally with a 32-channel transmit/receive (32TxRx) remote body coil for RF transmit and serving as receive references. METHODS The 16Rx array consists of 16 octagonal overlapping loops connected to custom-built detuning boards with preamplifiers. Performance metrics like noise correlation, g-factors, and signal-to-noise ratio gain were compared between 4 different RF coil configurations. In vivo body imaging was performed in volunteers using radiofrequency shimming, time interleaved acquisition of modes (TIAMO), and 2D spatially selective excitation using parallel transmit (pTx) in the spine. RESULTS Lower g-factors were obtained when using the 16Rx coil in addition to the 16TxRx array coil configuration versus the 16TxRx array alone. Distinct signal-to-noise ratio gain using the 16Rx coil could be demonstrated in the spine region both for a comparison with the 16TxRx coil (>50% gain) in vivo and the 32TxRx coil (>240% gain) in a phantom. The 16Rx coil was successfully applied to improve anatomical imaging in the abdomen and 2D spatially selective excitation in the spine of volunteers. CONCLUSION The novel 16-channel Rx-array as an add-on to multichannel TxRx RF coil configurations provides increased signal-to-noise ratio, lower g-factors, and thus improves 7T ultra-high field body MR imaging.
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Affiliation(s)
- Stefan H G Rietsch
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Sascha Brunheim
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Stephan Orzada
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany
| | - Maximilian N Voelker
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Stefan Maderwald
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany
| | - Andreas K Bitz
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.,Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, University of Applied Sciences Aachen, Aachen, Germany
| | - Marcel Gratz
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Mark E Ladd
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.,Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.,Faculty of Physics and Astronomy and Faculty of Medicine, University of Heidelberg, Heidelberg, Germany
| | - Harald H Quick
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.,High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
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Rietsch SHG, Orzada S, Maderwald S, Brunheim S, Philips BWJ, Scheenen TWJ, Ladd ME, Quick HH. 7T ultra-high field body MR imaging with an 8-channel transmit/32-channel receive radiofrequency coil array. Med Phys 2018; 45:2978-2990. [PMID: 29679498 DOI: 10.1002/mp.12931] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 03/20/2018] [Accepted: 03/30/2018] [Indexed: 12/11/2022] Open
Abstract
PURPOSE In this work, a combined body coil array with eight transmit/receive (Tx/Rx) meander elements and with 24 receive-only (Rx) loops (8Tx/32Rx) was developed and evaluated in comparison with an 8-channel transmit/receive body array (8Tx/Rx) based on meander elements serving as the reference standard. METHODS Systematic evaluation of the RF array was performed on a body-sized phantom. Body imaging at 7T was performed in six volunteers in the body regions pelvis, abdomen, and heart. Coil characteristics such as signal-to-noise ratio, acceleration capability, g-factors, S-parameters, noise correlation, and B1+ maps were assessed. Safety was ensured by numerical simulations using a coil model validated by dosimetric field measurements. RESULTS Meander elements and loops are intrinsically well decoupled with a maximum coupling value of -20.5 dB. Safe use of the 8Tx/32Rx array could be demonstrated. High gain in signal-to-noise ratio (33% in the subject's center) could be shown for the 8Tx/32Rx array compared to the 8Tx/Rx array. Improvement in acceleration capability in all investigations could be demonstrated. For example, the 8Tx/32Rx array provides lower g-factors in the right-left and anterior-posterior directions with R = 3 undersampling as compared to the 8Tx/Rx array using R = 2. Both arrays are very similar regarding their RF transmit performance. Excellent image quality in the investigated body regions could be achieved with the 8Tx/32Rx array. CONCLUSION In this work, we show that a combination of eight meander elements and 24 loop receive elements is possible without impeding transmit performance. Improved SNR and g-factor performance compared to an RF array without these loops is demonstrated. Body MRI at 7T with the 8Tx/32Rx array could be accomplished in the heart, abdomen, and pelvis with excellent image quality.
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Affiliation(s)
- Stefan H G Rietsch
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
| | - Stephan Orzada
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany
| | - Stefan Maderwald
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany
| | - Sascha Brunheim
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
| | - Bart W J Philips
- Department of Radiology and Nuclear Medicine, Medical Center, Radboud University, 6525GA, Nijmegen, The Netherlands
| | - Tom W J Scheenen
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany.,Department of Radiology and Nuclear Medicine, Medical Center, Radboud University, 6525GA, Nijmegen, The Netherlands
| | - Mark E Ladd
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany.,Medical Physics in Radiology, German Cancer Research Center, 69120, Heidelberg, Germany.,Faculty of Physics and Astronomy and Faculty of Medicine, University of Heidelberg, 69120, Heidelberg, Germany
| | - Harald H Quick
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, 45141, Essen, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, 45147, Essen, Germany
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Brunheim S, Gratz M, Johst S, Bitz AK, Fiedler TM, Ladd ME, Quick HH, Orzada S. Fast and accurate multi-channel B1+ mapping based on the TIAMO technique for 7T UHF body MRI. Magn Reson Med 2018; 79:2652-2664. [PMID: 28994132 DOI: 10.1002/mrm.26925] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 08/21/2017] [Accepted: 08/26/2017] [Indexed: 01/11/2023]
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.
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Affiliation(s)
- Sascha Brunheim
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany
- High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Marcel Gratz
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany
- High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Sören Johst
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany
| | - Andreas K Bitz
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, FH Aachen-University of Applied Sciences, Aachen, Germany
| | - Thomas M Fiedler
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Mark E Ladd
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany
- Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Harald H Quick
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany
- High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany
| | - Stephan Orzada
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany
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Pfaffenrot V, Brunheim S, Rietsch SHG, Koopmans PJ, Ernst TM, Kraff O, Orzada S, Quick HH. 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. Magn Reson Med 2018; 80:1252-1265. [DOI: 10.1002/mrm.27125] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 01/17/2018] [Accepted: 01/18/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Viktor Pfaffenrot
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
- High Field and Hybrid MR Imaging, University Hospital Essen; University of Duisburg-Essen; Essen Germany
| | - Sascha Brunheim
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
- High Field and Hybrid MR Imaging, University Hospital Essen; University of Duisburg-Essen; Essen Germany
| | - Stefan H. G. Rietsch
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
- High Field and Hybrid MR Imaging, University Hospital Essen; University of Duisburg-Essen; Essen Germany
| | - Peter J. Koopmans
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
- High Field and Hybrid MR Imaging, University Hospital Essen; University of Duisburg-Essen; Essen Germany
| | - Thomas M. Ernst
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
- Department of Neurology, University Hospital Essen; University of Duisburg-Essen; Essen Germany
| | - Oliver Kraff
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
| | - Stephan Orzada
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
| | - Harald H. Quick
- Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
- High Field and Hybrid MR Imaging, University Hospital Essen; University of Duisburg-Essen; Essen Germany
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Rietsch SHG, Pfaffenrot V, Bitz AK, Orzada S, Brunheim S, Lazik-Palm A, Theysohn JM, Ladd ME, Quick HH, Kraff O. An 8-channel transceiver 7-channel receive RF coil setup for high SNR ultrahigh-field MRI of the shoulder at 7T. Med Phys 2017; 44:6195-6208. [PMID: 28976586 DOI: 10.1002/mp.12612] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 08/11/2017] [Accepted: 09/15/2017] [Indexed: 12/16/2022] Open
Abstract
PURPOSE In this work, we present an 8-channel transceiver (Tx/Rx) 7-channel receive (Rx) radiofrequency (RF) coil setup for 7 T ultrahigh-field MR imaging of the shoulder. METHODS A C-shaped 8-channel Tx/Rx coil was combined with an anatomically close-fitting 7-channel Rx-only coil. The safety and performance parameters of this coil setup were evaluated on the bench and in phantom experiments. The 7 T MR imaging performance of the shoulder RF coil setup was evaluated in in vivo measurements using a 3D DESS, a 2D PD-weighted TSE sequence, and safety supervision based on virtual observation points. RESULTS Distinct SNR gain and acceleration capabilities provided by the additional 7-channel Rx-only coil were demonstrated in phantom and in vivo measurements. The power efficiency indicated good performance of each channel and a maximum B1+ of 19 μT if the hardware RF power limits of the MR system were exploited. MR imaging of the shoulder was demonstrated with clinically excellent image quality and submillimeter spatial resolution. CONCLUSIONS The presented 8-channel transceiver 7-channel receive RF coil setup was successfully applied for in vivo 7 T MRI of the shoulder providing a clear SNR gain vs the transceiver array without the additional receive array. Homogeneous images across the shoulder region were obtained using 8-channel subject-specific phase-only RF shimming.
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Affiliation(s)
- Stefan H G Rietsch
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, Essen, 45147, Germany
| | - Viktor Pfaffenrot
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, Essen, 45147, Germany
| | - Andreas K Bitz
- Faculty of Electrical Engineering and Information Technology, Electromagnetic Theory and Applied Mathematics, University of Applied Sciences Aachen, Aachen, Germany
| | - Stephan Orzada
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany
| | - Sascha Brunheim
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, Essen, 45147, Germany
| | - Andrea Lazik-Palm
- Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, 45147, Germany
| | - Jens M Theysohn
- Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, 45147, Germany
| | - Mark E Ladd
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany.,Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Harald H Quick
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany.,High Field and Hybrid MR Imaging, University Hospital Essen, Essen, 45147, Germany
| | - Oliver Kraff
- Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, 45141, Germany
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Krause F, Benjamins C, Lührs M, Eck J, Noirhomme Q, Rosenke M, Brunheim S, Sorger B, Goebel R. Real-time fMRI-based self-regulation of brain activation across different visual feedback presentations. Brain-Computer Interfaces 2017. [DOI: 10.1080/2326263x.2017.1307096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Florian Krause
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
| | - Caroline Benjamins
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
| | - Michael Lührs
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
| | - Judith Eck
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
| | - Quentin Noirhomme
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
| | - Mona Rosenke
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
- Department of Psychology, Stanford University, Stanford, CA, USA
| | - Sascha Brunheim
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany
| | - Bettina Sorger
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
| | - Rainer Goebel
- Department of Cognitive Neuroscience, Maastricht University, Maastricht, the Netherlands
- Department of Research and Development, Brain Innovation B.V., Maastricht, The Netherlands
- Department of Neuroimaging and Neuromodeling, Royal Netherlands Academy of Arts and Sciences (KNAW), Netherlands Institute for Neuroscience, Amsterdam, The Netherlands
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Prochnow D, Brunheim S, Steinhäuser L, Seitz R. Reasoning about the implications of facial expressions: A behavioral and fMRI study on low and high social impact. Brain Cogn 2014; 90:165-73. [DOI: 10.1016/j.bandc.2014.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Revised: 04/06/2014] [Accepted: 07/13/2014] [Indexed: 12/30/2022]
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11
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Prochnow D, Brunheim S, Kossack H, Eickhoff SB, Markowitsch HJ, Seitz RJ. Anterior and posterior subareas of the dorsolateral frontal cortex in socially relevant decisions based on masked affect expressions. F1000Res 2014; 3:212. [PMID: 26236464 PMCID: PMC4516020 DOI: 10.12688/f1000research.4734.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/01/2015] [Indexed: 08/22/2023] Open
Abstract
Socially-relevant decisions are based on clearly recognizable but also not consciously accessible affective stimuli. We studied the role of the dorsolateral frontal cortex (DLFC) in decision-making on masked affect expressions using functional magnetic resonance imaging. Our paradigm permitted us to capture brain activity during a pre-decision phase when the subjects viewed emotional expressions below the threshold of subjective awareness, and during the decision phase, which was based on verbal descriptions as the choice criterion. Using meta-analytic connectivity modeling, we found that the preparatory phase of the decision was associated with activity in a right-posterior portion of the DLFC featuring co-activations in the left-inferior frontal cortex. During the subsequent decision a right-anterior and more dorsal portion of the DLFC became activated, exhibiting a different co-activation pattern. These results provide evidence for partially independent sub-regions within the DLFC, supporting the notion of dual associative processes in intuitive judgments.
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Affiliation(s)
- Denise Prochnow
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
| | - Sascha Brunheim
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
| | - Hannes Kossack
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
| | - Simon B. Eickhoff
- Institute for Clinical Neuroscience and Medical Psychology, University of Düsseldorf, Düsseldorf, D-40225, Germany
| | | | - Rüdiger J. Seitz
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
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12
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Prochnow D, Brunheim S, Kossack H, Eickhoff SB, Markowitsch HJ, Seitz RJ. Anterior and posterior subareas of the dorsolateral frontal cortex in socially relevant decisions based on masked affect expressions. F1000Res 2014; 3:212. [PMID: 26236464 PMCID: PMC4516020 DOI: 10.12688/f1000research.4734.3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/01/2015] [Indexed: 12/24/2022] Open
Abstract
Socially-relevant decisions are based on clearly recognizable but also not consciously accessible affective stimuli. We studied the role of the dorsolateral frontal cortex (DLFC) in decision-making on masked affect expressions using functional magnetic resonance imaging. Our paradigm permitted us to capture brain activity during a pre-decision phase when the subjects viewed emotional expressions below the threshold of subjective awareness, and during the decision phase, which was based on verbal descriptions as the choice criterion. Using meta-analytic connectivity modeling, we found that the preparatory phase of the decision was associated with activity in a right-posterior portion of the DLFC featuring co-activations in the left-inferior frontal cortex. During the subsequent decision a right-anterior and more dorsal portion of the DLFC became activated, exhibiting a different co-activation pattern. These results provide evidence for partially independent sub-regions within the DLFC, supporting the notion of dual associative processes in intuitive judgments.
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Affiliation(s)
- Denise Prochnow
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
| | - Sascha Brunheim
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
| | - Hannes Kossack
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
| | - Simon B Eickhoff
- Institute for Clinical Neuroscience and Medical Psychology, University of Düsseldorf, Düsseldorf, D-40225, Germany
| | - Hans J Markowitsch
- Department of Psychology, Bielefeld University, Bielefeld, D-33615, Germany
| | - Rüdiger J Seitz
- Department of Neurology, Heinrich-Heine University Düsseldorf, Düsseldorf, D-40225, Germany
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Prochnow D, Kossack H, Brunheim S, Müller K, Wittsack HJ, Markowitsch HJ, Seitz RJ. Processing of subliminal facial expressions of emotion: A behavioral and fMRI study. Soc Neurosci 2013; 8:448-61. [DOI: 10.1080/17470919.2013.812536] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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14
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Prochnow D, Bermúdez i Badia S, Schmidt J, Duff A, Brunheim S, Kleiser R, Seitz RJ, Verschure PFMJ. A functional magnetic resonance imaging study of visuomotor processing in a virtual reality-based paradigm: Rehabilitation Gaming System. Eur J Neurosci 2013; 37:1441-7. [PMID: 23414211 DOI: 10.1111/ejn.12157] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 01/10/2013] [Accepted: 01/16/2013] [Indexed: 11/30/2022]
Affiliation(s)
- D. Prochnow
- Department of Neurology; University Hospital Düsseldorf; Düsseldorf; Germany
| | - S. Bermúdez i Badia
- Madeira Interactive Technologies Institute; Universidade da Madeira; Funchal; Portugal
| | - J. Schmidt
- Department of Neurology; University Hospital Düsseldorf; Düsseldorf; Germany
| | - A. Duff
- SPECS Laboratory; Universitat Pompeu Fabra; Barcelona; Spain
| | - S. Brunheim
- Department of Neurology; University Hospital Düsseldorf; Düsseldorf; Germany
| | | | - R. J. Seitz
- Department of Neurology; University Hospital Düsseldorf; Düsseldorf; Germany
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Schmidt J, Prochnow D, Bermúdez i Badia S, Duff A, Brunheim S, Kleiser R, Seitz RJ, Verschure P. Neural correlates of visuomotor transformations using the Rehabilitation Gaming System (RGS): actual and imagined target catching. KLIN NEUROPHYSIOL 2012. [DOI: 10.1055/s-0032-1301555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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