ultra-high field MRI
Design of Radio-Frequency Arrays for Ultra-High Field MRI
... Among the numerous advancements presented throughout Chapters 2 – 5, several fundamental conclusions can be drawn. As seen in Chapter 2, it is possible to derive a physical model that generalizes the equivalent circuit ...
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Ultra High Field MRI Visualization of Cortical Multiple Sclerosis Lesions with T2 and T2*: A Postmortem MRI and Histopathology Study
... Imaging was performed by using a 7T BioSpec USR70/30 imager (Bruker BioSpin MRI, Ettlingen, Germany), and a vendor-pro- vided 8.6-cm-diameter radiofrequency transmit/receive coil (model 1P T12053V3). Each ...
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Comparing GABA dependent physiological measures of inhibition with proton magnetic resonance spectroscopy measurement of GABA using ultra high field MRI
... Imbalances in glutamatergic (excitatory) and GABA (inhibitory) signalling within key brain networks are thought to underlie many brain and mental health disorders, and for this reason there is considerable interest in ...
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Altered Brain Networks In Patients with Psychogenic Non-Epileptic Seizures (PNES) Using Ultra High Field MRI
... Our brain is organized into networks composed of functionally and structurally joined regions with the functional communication between regions being of high importance to examine complex cognitive processes and ...
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Initial Investigation into Microbleeds and White Matter Signal Changes following Radiotherapy for Low Grade and Benign Brain Tumors Using Ultra High Field MRI Techniques
... magnetic field strengths available clinically (3T) or for re- search ( ⱖ ...linear-with- field-enhancement of the paramagnetic effect of the hemosiderin ...magnetic field can be misinterpreted as a ...
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Quantitative Susceptibility Imaging of Tissue Microstructure Using Ultra-High Field MRI
... susceptibility-based MRI at 7T to identify characteristic regions suggestive of demyelination and increased iron deposition in MS patients and relate these measurements to patient ...
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Morphology Specific Discrimination between MS White Matter Lesions and Benign White Matter Hyperintensities Using Ultra High Field MRI
... CONCLUSIONS Based on the investigation of the North American Imaging in Multiple Sclerosis consensus criteria, we have identified a sensitive and specific radiologic definition for CVS: [r] ...
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Ultra-High Field Magnetic Resonance Imaging for Stereotactic Neurosurgery
... lower field strengths ...in ultra-high field (≥ 7 Tesla or 7T) imaging have important potential implications for targeting structures enabling better visualization as a result of its increased ...
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Ultra High Field (7T) Magnetic Resonance Imaging of Intracranial Vessel Wall
... subject MRI at ultra high field strength are very strict when concerning metallic implants, like stents or surgical clips, which are not uncommonly present in patients with cerebrovascular ...
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Ultra-high field MR angiography in human migraine models: a 3.0 T/7.0 T comparison study
... We recruited healthy volunteers through a Danish recruitment website (www.forsoegsperson.dk). Partici- pants were offered enrollment in this 7.0 T continuation study upon completion of the prior 3.0 T study, results of ...
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ECG based gating in ultra high field cardiovascular magnetic resonance using an independent component analysis approach
... The results achieved in this work are based on 12- lead ECG signals. However, the hardware which was used to record the 12-lead ECGs is not MR safe and hence it cannot be used during MR imaging. Up to now, there is no MR ...
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Ultra high field arterial spin labeling MRI for non contrast assessment of cortical lesion perfusion in multiple sclerosis
... Twelve MS patients (8 female, mean age=50; range=35-64 years) gave informed consent and were scanned on a 7 Tesla Philips Achieva scanner. Perfusion data were collected at multiple post-labeling delay times using a ...
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Methods for muscle Magnetic Resonance Imaging at Ultra High Field
... In Chapter 4 is exposed a method to develop an automatic algorithm of segmentation, able also to quantify fat inltration percentage in muscles of the leg. Such algorithm has been preliminary optimized and validated by ...
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An intra neural microstimulation system for ultra high field magnetic resonance imaging and magnetoencephalography
... To ensure compatibility with the MRI scanner, the amplifier and stimulator units have suitable screening and RF protection. 5 k resistors are placed in-line with the electrode connections internal to the head-stage ...
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Emerging Use of Ultra High Field 7T MRI in the Study of Intracranial Vascularity: State of the Field and Future Directions
... to MRI and radiofrequency pulse ...at ultra-high- fi eld strengths, Methods for Producing a Semi-Adiabatic Spectral-Spatial Spectroscopic Imaging Sequence and Devices Thereof, and Semi-Adiabatic ...
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Ultra High Field Diffusion MRI Reveals Early Axonal Pathology in Spinal Cord of ALS mice
... Previous clinical and animal diffusion imaging studies ALS SCs have shown that regional changes in parameters were more affected at the distal than proximal regions [14, 33]. Hence, we centered our MRI diffusion ...
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High Field MRI Contribution in Tolosa Hunt Syndrome (THS) Report of Two Cases and Review of Literature
... by MRI or biopsy on the one hand and to rule out another cause of painful ophthalmoplegia by the appropriate ...examinations. High field MRI is the most powerful current technique to explore ...
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Application of SQUIDs to low temperature and high magnetic field measurements—ultra low noise torque magnetometry
... As can be seen in Eqn. 1 and 2, both resistance sensitivi- ties scale with the excitation current and can therefore be made arbitrarily small by increasing the excitation cur- rent. However, power dissipation is a major ...
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Study on Technical Measures of Romashkino Oil Field after Entering Ultra High Water Cut Stage
... Injection of Hydroxyethylcellulose—An Ecological Pure Product for Enhanced Oil Recovery in the Field of Ro- mashkino,” Proceedings of SPE Offshore Europe Con- ference, Aberdeen, 23-24 October 1999, pp. 39-43. [3] ...
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The Application of Ultra High Voltage in the World
... In Canada, at the HV laboratory of Hydro-Que’bec Institute of Research (IREQ) studies related to voltages up to 1500 kV were performed. Test studies such as Corona, electric field and ion current performance were ...
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