Magnetic Resonance Imaging Basics

A collection of flashcards covering key terms and concepts relevant to Magnetic Resonance Imaging and its interpretation.

Magnetic Resonance Imaging (MRI)

A medical imaging technique that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body.

Electromagnetic Spectrum

The range of all types of electromagnetic radiation, including gamma rays, X-rays, ultraviolet light, visible light, infrared, microwaves, and radio waves.

Tesla (T)

A unit of measurement for the strength of magnetic fields, commonly used in MRI to describe the strength of the magnet.

Precession

The motion of spinning hydrogen protons influenced by an external magnetic field in MRI.

TR (Time Repetition)

The time interval between successive RF pulses in MRI.

TE (Time Echo)

The time interval between the application of the RF pulse and the acquisition of the resulting echo in MRI.

Hyperintensity

In MRI, a term used to describe increased or high intensity signals that appear white on the image.

Hypointensity

In MRI, a term used to describe decreased or low intensity signals that appear black on the image.

Isointense

In MRI, a term used to refer to two structures having the same signal intensity.

Fat Suppression

A technique used in MRI to reduce the signal from fat, enhancing the visualization of adjacent structures.

Gadolinium

A paramagnetic contrast agent used in MRI to enhance the visibility of tissues by reducing T1 relaxation time.

STIR (Short Tau Inversion Recovery)

A fat suppression technique in MRI that uses inversion recovery to eliminate the fat signal.

fMRI (functional Magnetic Resonance Imaging)

A technique that measures and maps brain activity by detecting changes associated with blood flow.

Signal Void

An area in an MRI image that appears black due to the absence of signal, often correlated with fluid or certain pathologies.

MRI Safety

Precautions that must be taken to ensure safety in the MRI environment, including restrictions on metal objects and implants.

T1-weighted Image

An MRI image that highlights fat and provides contrast between different types of tissues, useful for anatomical detail.

T2-weighted Image

An MRI image that highlights water and fluid, providing contrast for edema and pathology visualization.