how do mri machines work


Magnetic resonance imaging - Wikipedia, the free encyclopedia

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** Magnetic resonance imaging **

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"MRI" redirects here. For other uses, see MRI (disambiguation).

Magnetic resonance imaging
/Diagnostics/
File:Structural MRI animation.ogvPlay media
Para-sagittal MRI of the head, with aliasing artifacts (nose and forehead
appear at the back of the head)
ICD-9-CM 88.91
MeSH D008279
MedlinePlus 003335

*Magnetic resonance imaging* (*MRI*), *nuclear magnetic resonance imaging*
(*NMRI*), or *magnetic resonance tomography* (*MRT*) is a medical imaging
technique used in radiology to investigate the anatomy and physiology of
the body in both health and disease. MRI scanners use magnetic fields and
radio waves to form images of the body. The technique is widely used in
hospitals for medical diagnosis, staging of disease and follow-up without
exposure to ionizing radiation.

*Contents*

· 1 Medical uses

· 1.1 Neuroimaging
· 1.2 Cardiovascular
· 1.3 Musculoskeletal
· 1.4 Liver and gastrointestinal MRI
· 1.5 Functional MRI
· 1.6 Oncology

· 2 Safety

· 2.1 Implants
· 2.2 Projectile risk
· 2.3 EEG cup electrodes
· 2.4 Genotoxic effects
· 2.5 Peripheral nerve stimulation (PNS)
· 2.6 Heating caused by absorption of radio waves
· 2.7 Acoustic noise
· 2.8 Cryogens
· 2.9 Pregnancy
· 2.10 Claustrophobia and discomfort
· 2.11 MRI versus CT
· 2.12 Guidance
· 2.13 The European Directive on Electromagnetic Fields

· 3 Procedure

· 3.1 Contrast

· 3.1.1 Contrast agents

· 4 History

· 4.1 2003 Nobel Prize

· 5 Economics

· 5.1 Overuse

· 6 Specialized applications

· 6.1 Diffusion MRI
· 6.2 Magnetic resonance angiography
· 6.3 Magnetic resonance spectroscopy
· 6.4


Source: en.wikipedia.org/wiki/Magnetic_resonance_imaging

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