Problems and chances of high field magnetic resonance imaging.

[Problems and chances of high field magnetic resonance imaging]. Radiologe. 2013 May;53(5):401-10 Authors: Ladd ME, Bock M Abstract CLINICAL/METHODICAL ISSUE: The spatial, temporal and spectral resolution in magnetic resonance imaging (MRI) is in many cases currently not sufficient to detect submillimeter lesions or to image the dynamics of the beating heart. STANDARD RADIOLOGICAL METHODS: At present MRI systems at 1.5 T and 3 T are the standard units for clinical imaging. METHODICAL INNOVATIONS: The use of ultrahigh magnetic fields of 7 T and higher increases the signal-to-noise ratio, which holds promise for a significant improvement of the spatial and/or temporal resolution as well as for new contrast mechanisms. PERFORMANCE: With 7 T MRI, images of the brain have been acquired routinely with a spatial resolution of 0.3 mm. The theoretical improvement of the signal-to-noise ratio is often not fully realized due to B1 inhomogeneities and contrast variations. ACHIEVEMENTS: With MRI at 7 T a notable increase in spatial resolution can be achieved. Methods such as time-of-flight MR angiography and susceptibility-weighted imaging (e.g. neurofunctional MRI, fMRI) profit especially from the higher field strengths. Transmission field inhomogeneities are still a major challenge for ultrahigh field (UHF) MRI and are also a partially unsolved safety problem. PRACTICAL RECOMMENDATIONS: The use of UHF MRI is currently limited to special app...
Source: Der Radiologe - Category: Radiology Authors: Tags: Radiologe Source Type: research

Related Links:

Publication date: Available online 5 December 2019Source: American Heart JournalAuthor(s): Odayme Quesada, Ahmed AlBadri, Janet Wei, Chrisandra Shufelt, Puja K. Mehta, Jenna Maughan, Nissi Suppogu, Haider Aldiwani, Galen Cook-Wiens, Michael D. Nelson, Behzad Sharif, Eileen M. Handberg, David R. Anderson, John Petersen, Daniel S. Berman, Louise E.J. Thomson, Carl J. Pepine, C. Noel Bairey MerzBackgroundA significant number of women with signs and symptoms of ischemia with no obstructive coronary artery disease (INOCA) have coronary vascular dysfunction, detected by invasive coronary reactivity testing (CRT). However, the no...
Source: American Heart Journal - Category: Cardiology Source Type: research
We report a 75-year-old woman referred for non-ST-elevation myocardial infarction due to prominent Thebesian veins who displayed a perfusion defect in cardiac magnetic resonance imaging.
Source: Journal of Cardiology Cases - Category: Cardiology Source Type: research
Conclusion: ASA occlusion was not observed in CCM patients with spinal canal sagittal diameter compression of more than 80%. PMID: 31791211 [PubMed - as supplied by publisher]
Source: Journal of Spinal Cord Medicine - Category: Orthopaedics Tags: J Spinal Cord Med Source Type: research
Publication date: August 2019Source: Revista Portuguesa de Cardiologia (English Edition), Volume 38, Issue 8Author(s): Beatriz Saldanha Santos, Maria João FerreiraAbstractNon-invasive assessment of ischemic heart disease remains a challenging task, even with a large armory of diagnostic modalities. Positron emission tomography (PET) is an advanced radionuclide technique that has been available for decades. Originally used as a research tool that contributed to advances in the understanding of cardiovascular pathophysiology, it is now becoming established in clinical practice and is increasingly used in the diagnosis...
Source: Revista Portuguesa de Cardiologia - Category: Cardiology Source Type: research
A previously healthy 13-year-old girl presented with a 9-day history of acute onset severe neck pain associated with limited range of movement. Medical evaluation at day 2 was suggestive of muscle contracture, and she was discharged home with diazepam, antiinflammatory agents, and rest; however, she returned because of progressive clinical worsening with left arm distal paresthesia and paralysis since day 3. There was no history of trauma or other systemic complaints, and her familial medical history was unremarkable. Physical examination revealed left cervical and paravertebral tenderness on palpation with severe limitat...
Source: Pediatric Emergency Care - Category: Emergency Medicine Tags: Illustrative Cases Source Type: research
Introduction: Deep vein thrombosis (DVT) is a severe health problem. Treatment options may differ between acute and chronic DVT. Thus, distinguishing acute from chronic DVT is essential for patients with DVT.
Source: European Journal of Vascular and Endovascular Surgery - Category: Surgery Authors: Source Type: research
Abstract Numerous recent technological advances offer the potential to substantially enhance the MRI evaluation of moyamoya disease (MMD). These include high-resolution volumetric imaging, high-resolution vessel wall characterization, improved cerebral angiographic and perfusion techniques, high-field imaging, fast scanning methods, and artificial intelligence. This review discusses the current state-of-the-art MRI applications in these realms, emphasizing key imaging findings, clinical utility, and areas that will benefit from further investigation. Although these techniques may apply to imaging of a wide array o...
Source: Neurosurgical Focus - Category: Neurosurgery Authors: Tags: Neurosurg Focus Source Type: research
To determine if magnetic resonance angiography (MRA) and/or magnetic resonance imaging (MRI) could accurately determine the width of the labrum.
Source: Arthroscopy - Journal of Arthroscopic and Related Surgery - Category: Surgery Authors: Tags: Original Article With Video Illustration Source Type: research
CONCLUSIONS: According to the results of postoperative DW-MRI, retrograde perfusion itself might not increase the incidence of postoperative cerebral embolism in properly selected cardiac surgery patients undergoing routine preoperative CTA examination. PMID: 31776305 [PubMed - as supplied by publisher]
Source: Circulation Journal - Category: Cardiology Authors: Tags: Circ J Source Type: research
A 42-year-old man presented to the emergency department with a 20-day history of blood-stained sputum. Computed tomography angiography (CTA) of the pulmonary arteries demonstrated multiple low-density filling defects in the main trunk, lobar branches of the pulmonary artery, Superior vena cava (SVC) and right ventricle (RV) (Fig. 1A and B, C, D). One non-calcified nodule and small patchy shadows were noted at right lung field (Fig. 2 E1, E2), which were suspicious of metastasis. Transthoracic echocardiography (TTE) and cardiovascular magnetic resonance imaging (CMR) had revealed a mass within the right atrium (RA) and RV (...
Source: Journal of Cardiovascular Computed Tomography - Category: Radiology Authors: Source Type: research
More News: Angiography | Brain | Cardiology | Heart | MRI Scan | Neurology | Radiology