* Magnetic resonance imaging ( MRI ) MRI is a method of imaging objects that uses a strong magnetic field to detect the relaxation of protons that have been perturbed by a radio-frequency pulse.

If a CT is used in conjunction of dye this is called a computerized tomography angiogram while if MRI is used it is called magnetic resonance angiogram.

MRI and fMRI scans have shown that the amygdala in individuals diagnosed with such disorders including bipolar or panic disorder is larger and wired for a higher level of fear.

Helium is used in cryogenics ( its largest single use, absorbing about a quarter of production ), particularly in the cooling of superconducting magnets, with the main commercial application being in MRI scanners.

MRI of the cranium and orbits is also performed to exclude compressive and inflammatory lesions of the cranial nerves and ocular muscles.

Magnetic resonance imaging ( MRI ), nuclear magnetic resonance imaging ( NMRI ), or magnetic resonance tomography ( MRT ) is a medical imaging technique used in radiology to visualize internal structures of the body in detail.

An MRI scanner is a device in which the patient lies within a large, powerful magnet where the magnetic field is used to align the magnetization of some atomic nuclei in the body, and radio frequency fields to systematically alter the alignment of this magnetization.

By changing the settings on the scanner, this effect is used to create contrast between different types of body tissue or between other properties, as in fMRI and diffusion MRI.

Unlike CT, MRI uses no ionizing radiation and is generally a very safe procedure.

MRI is used to image every part of the body, and is particularly useful for tissues with many hydrogen nuclei and little density contrast, such as the brain, muscle, connective tissue and most tumors.

Because the magnetic field is " tuned " by the second magnet, a PMRI scan can be obtained immediately adjacent to a metal prosthetic, unlike an MRI scan.

Although MRI is most commonly performed at 1. 5T, higher fields ( such as 3T ) are gaining more popularity due to the increased sensitivity and resolution.

In clinical practice, MRI is used to distinguish pathologic tissue ( such as a brain tumor ) from normal tissue.

One advantage of an MRI scan is that it is harmless to the patient.

The basis of this ability is the complex library of pulse sequences that the modern medical MRI scanner includes, each of which is optimized to provide image contrast based on the chemical sensitivity of MRI.

The frequency of new enhancing lesions as detected by Gd-enhanced MRI was reduced by more than half in 12 patients, comparing the six-month run-in phase to the six-month post-BCG phase of the experiment.

It presents more prominently on MRI than on CT, often taking several weeks after acute onset of symptoms before it becomes identifiable.

It may also identify widening of the mediastinum suggestive of thymoma, but computed tomography ( CT ) or magnetic resonance imaging ( MRI ) are more sensitive ways to identify thymomas, and are generally done for this reason.

Patients with a normal MRI still develop MS ( 16 %), but at a lower rate compared to those patients with three or more MRI lesions ( 51 %).

More recently, psychophysiologists have been equally, or potentially more, interested in the central nervous system, exploring cortical brain potentials such as the many types of event-related potentials ( ERPs ), brain waves, and utilizing advanced technology such as functional magnetic resonance imaging ( fMRI ), MRI, PET, MEG, and other neuroimagery techniques.

Because individual PET scans are more expensive than " conventional " imaging with computed tomography ( CT ) and magnetic resonance imaging ( MRI ), expansion of FDG-PET in cost-constrained health services will depend on proper health technology assessment ; this problem is a difficult one because structural and functional imaging often cannot be directly compared, as they provide different information.

MRI is more sensitive in a first apparently unprovoked seizure.

While a CT scan can show the bony structures in more detail, an MRI scan can better portray soft tissue.

Moreover the MRI enables to differentiate more precisely the cell composition, and thus easily identify the gray matter in that region.

Medical equipment is continuing to advance with more embedded systems for vital signs monitoring, electronic stethoscopes for amplifying sounds, and various medical imaging ( PET, SPECT, CT, MRI ) for non-invasive internal inspections.

The diagnosis of PMD is often first suggested after identification by magnetic resonance imaging ( MRI ) of abnormal white matter ( high T2 signal intensity, i. e. T2 lengthening ) throughout the brain, which is typically evident by about 1 year of age, but more subtle abnormalities should be evident during infancy.

In several MRI studies that have been conducted, it has been found that people with trichotillomania have more gray matter in their brains than those who do not suffer from the disorder.

A CT scan or an MRI scan is more sensitive in displaying the thrombus.

The magnetic field is about the same strength as an MRI, and the pulse generally reaches no more than 5 centimeters into the brain.

With more than 40 million dollars in facility and equipment improvements since 1996, this modern facility provides state-of-the-art technologies, including open MRI, PET imaging, interventional radiology and digital mammography with CAD over-read capabilities.

Using MRI scans, Dr. Murray Stein, of the University of California, San Diego, found that when people with the disorder are shown pictures of angry faces, their amygdala-the brain's fear center-lights up with more activity than it does in people without the condition.

Calcium-sensitive agents make MRI more sensitive to calcium concentrations, with calcium ions often being the messengers for cellular signalling pathways in active neurons.

Through thorough clinical evaluation, via physical findings, detailed patient history, and advanced imaging techniques, such as angiogram, computerized tomography ( CT scan ), magnetic resonance imaging ( MRI ), or more rarely transillumination ( shining of bright light through the skull ) after birth are the most accurate diagnostic techniques.

MRI's are more expensive and not as available because fewer facilities have MRI machines.

With the exception of one instance of specificity, it was discovered that MRI was more sensitive and specific than CT in all four studies.

Teratomas within the fetal body are less easily seen with ultrasound ; for these, MRI of the pregnant uterus is more informative.

Magnetic resonance imaging ( MRI ) is more sensitive than simple X-ray in the detection of lytic lesions, and may supersede skeletal survey, especially when vertebral disease is suspected.

Because CT and MRI are sensitive to different tissue properties, the appearance of the images obtained with the two techniques differ markedly.

Magnetic resonance imaging ( MRI ) is the most sensitive test for detecting pituitary tumours and determining their size.

Computed Tomography ( CT scan ) also gives an image of the pituitary, but it is less sensitive than the MRI.

Computed tomography ( CT ) or magnetic resonance imaging ( MRI ) is sometimes employed although these methods are generally not as sensitive.

Moreover, given the sensitive, biologic nature of breast tissue, periodic MRI and 3-D volumetric imaging examinations are required to monitor the breast-tissue viability and the maintenance of the large volume (+ 300cc ) fat grafts.

PET is more sensitive than any other human imaging method, such as MRI or CT, especially for the detection of cancer.

Magnetic resonance imaging ( MRI ) may be more sensitive than CT after several days.

MRI is more sensitive in detection of intraventricular cysts.

An Indium-111 pentetreotide scan is more sensitive than ultrasound, CT, or MRI for detection of somatostatin receptor positive tumors.

The doctor will also request a magnetic resonance imaging ( MRI ), which is the most sensitive test for detecting pituitary tumors and determining their size.

Computed Tomography ( CT scan ) also gives an image of the pituitary, but it is less sensitive than the MRI.

Stage migration describes change in the distribution of stage in a particular cancer population induced by either a change in the staging system itself or else a change in technology which allows more sensitive detection of tumor spread and therefore more sensitivity in detecting spread of disease ( e. g., the use of MRI scan ).

MRI is more sensitive than CT scans, but MRI may also miss DAI, because it identifies the injury using signs of edema, which may not be present.

The MRI is sensitive in identifying tendon degeneration ( tendinopathy ), however, the MRI may not be able to reliably distinguish between a degenerative tendon and a partially torn tendon.

It has been found to be much more sensitive than MRI and isotope scans to detect bone involvement in multiple myeloma.

Finally, the method of diffusion MRI has been shown to be also sensitive to perfusion, as the movement of water in blood vessels mimics a random process ( IntraVoxel Incoherent Motion or IVIM model ).