| Info Sheets |
| | | | | | | | | | | | | | | | | | | | | | | | |
| Out- side |
| | | | |
|
| | | | |
Result : Searchterm 'high field' found in 1 term [] and 35 definitions []
| previous 6 - 10 (of 36) nextResult Pages : [1] [2 3 4 5 6 7 8] | | | | Searchterm 'high field' was also found in the following services: | | | | |
| | |
| |
|
| | | | | Further Reading: | | Basics:
|
|
News & More:
| |
| |
| | | | | |
| |
|
Brain imaging, magnetic resonance imaging of the head or skull, cranial magnetic resonance tomography (MRT), neurological MRI - they describe all the same radiological imaging technique for medical diagnostic.
Magnetic resonance imaging of the human brain includes the anatomic description and the detection of lesions. Special techniques like diffusion weighted imaging, functional magnetic resonance imaging ( fMRI) and spectroscopy provide also information about the function and chemical metabolites of the brain.
MRI provides detailed pictures of brain and nerve tissues in multiple planes without obstruction by overlying bones. Brain MRI is the procedure of choice for most brain disorders. It provides clear images of the brainstem and posterior brain, which are difficult to view on a CT scan. It is also useful for the diagnosis of demyelinating disorders (disorders such as multiple sclerosis (MS) that cause destruction of the myelin sheath of the nerve).
With this noninvasive procedure also the evaluation of blood flow and the flow of cerebrospinal fluid (CSF) is possible. Different MRA methods, also without contrast agents can show a venous or arterial angiogram. MRI can distinguish tumors, inflammatory lesions, and other pathologies from the normal brain anatomy. However, MRI scans are also used instead other methods to avoid the dangers of interventional procedures like angiography (DSA - digital subtraction angiography) as well as of repeated exposure to radiation as required for computed tomography (CT) and other X-ray examinations.
A ( birdcage) bird cage coil achieves uniform excitation and reception and is commonly used to study the brain. Usually a brain MRI procedure includes FLAIR, T2 weighted and T1 weighted sequences in two or three planes. See also Fetal MRI, Fluid Attenuation Inversion Recovery ( FLAIR), Perfusion Imaging and High Field MRI. See also Arterial Spin Labeling. | | | | | | | | • View the DATABASE results for 'Brain MRI' (14).
| | | • View the NEWS results for 'Brain MRI' (32).
| | | | Further Reading: | Basics:
|
|
News & More:
| |
MRI Reveals Significant Brain Abnormalities Post-COVID Monday, 21 November 2022 by neurosciencenews.com | | |
Combining genetics and brain MRI can aid in predicting chances of Alzheimer's disease Wednesday, 29 June 2022 by www.sciencedaily.com | | |
Roundup: How Even Mild COVID Can Affect the Brain; This Many Daily Steps Improves Longevity; and More Friday, 11 March 2022 by baptisthealth.net | | |
A low-cost and shielding-free ultra-low-field brain MRI scanner Tuesday, 14 December 2021 by www.nature.com | | |
Large International Study Reveals Spectrum of COVID-19 Brain Complications Tuesday, 9 November 2021 by www.itnonline.com | | |
Brain MRI-Based Subtypes of MS Predict Disability Progression, Treatment Response Thursday, 13 May 2021 by www.neurologyadvisor.com | | |
New MRI method improves detection of disease changes in the brain's network Thursday, 11 June 2020 by www.compute.dtu.dk | | |
New NeuroCOVID Classification System Uses MRI to Categorize Patients Friday, 12 June 2020 by www.diagnosticimaging.com | | |
New MRI technique can 'see' molecular changes in the brain Thursday, 5 September 2019 by medicalxpress.com | | |
Talking therapy or medication for depression: Brain scan may help suggest better treatment Monday, 27 March 2017 by www.newsnation.in | | |
MRI identifies brain abnormalities in chronic fatigue syndrome patients Wednesday, 29 October 2014 by www.eurekalert.org | | |
MRIs Useful in Tracking Depression in MS Patients Tuesday, 1 July 2014 by www.hcplive.com | | |
Contrast agent linked with brain abnormalities on MRI Tuesday, 17 December 2013 by www.sciencecodex.com | | |
MRIs Reveal Signs of Brain Injuries Not Seen in CT Scans Tuesday, 18 December 2012 by www.sciencedaily.com | | |
Iron Deposits in the Brain May Be Early Indicator of MS Wednesday, 13 November 2013 by www.healthline.com | | |
Migraine Sufferers Have Thicker Brain Cortex Tuesday, 20 November 2007 by www.medicalnewstoday.com |
|
| |
| | | | | |
| |
|
A large network of interconnecting blood vessels at the base of the brain that when visualized resembles a circle, the arteries effectively act as anastomoses for each other. This means that if any one of the communicating arteries becomes blocked, blood can flow from another part of the circle to ensure that blood flow is not compromised.
The circle of Willis is formed by both the internal carotid arteries, entering the brain from each side and the basilar artery, entering posteriorly. The connection of the vertebral arteries forms the basilar artery. The basilar artery divides into the right and left posterior cerebral arteries.
The internal carotid arteries trifurcate into the anterior cerebral artery, middle cerebral artery, and posterior communicating artery.
The two anterior cerebral arteries are joined together anteriorly by the anterior communicating artery. The posterior communicating arteries join the posterior cerebral arteries, completing the circle of Willis. The time of flight angiography MRI technique allows imaging of the circle of Willis without the need of a contrast medium (best results with high field MRI). A cerebrovasular contrast enhanced magnetic resonance angiography ( MRA) depicts the circle of Willis in addition to the vessels of the neck (carotid and vertebral arteries) with one bolus injection of a contrast agent.
For Ultrasound Imaging (USI) see Cerebrovascular Ultrasonography at Medical-Ultrasound-Imaging.com. | | | | | | • View the DATABASE results for 'Circle of Willis' (5).
| | | | Further Reading: | News & More:
|
|
| |
| | | Searchterm 'high field' was also found in the following services: | | | | |
| | |
| |
|
The principal contraindications of the MRI procedure are mostly related to the presence of metallic implants in a patient. The risks of MRI scans increase with the used field strength. In general, implants are becoming increasingly MR safe and an individual evaluation is carried out for each case.
Some patients should not be examined in MRI machines, or come closer than the 5 Gauss line to the system.
Absolute Contraindications for the MRI scan:
•
electronically, magnetically, and mechanically activated implants
•
metallic splinters in the eye
Patients with absolute contraindications should not be examined or only with special MRI safety precautions. Patients with an implanted cardiac pacemaker have been scanned on rare occasions, but pacemakers are generally considered an absolute contraindication. Relative contraindications may pose a relative hazard, and the type and location of an implant should be assessed prior to the MRI examination.
Relative Contraindications for the MRI scan:
•
other pacemakers, e.g. for the carotid sinus
Osteosynthesis material is usually anchored so well in the patients that no untoward effect will result. Another effect on metal parts in the patient's body is the heating of these parts through induction. In addition, image quality may be severely degraded. The presence of other metallic implants such as surgical clips etc. should be made known to the MRI operators. Most of these materials are non-magnetic, but if magnetic, they can pose a hazard.
See also MRI safety, Pregnancy, Claustrophobia and Tattoos. | | | | | | | | | • View the DATABASE results for 'Contraindications' (11).
| | | | Further Reading: | Basics:
|
|
News & More:
| |
| |
| | | | | |
| |
|
| | | | • View the DATABASE results for 'Diffusion Weighted Sequence' (6).
| | | | Further Reading: | Basics:
|
|
News & More:
| |
| |
| | | | |
| | | |
|
| |
| Look Ups |
| |