Magnetic Resonance Imaging

Which is the most versatile of the modalities

MRI

Information gathered from MRIs

Anatomical

Functional

Chemical concentrations

What is the modality that uses intrinsic properties

MRI

Does MRI have high resolution

yes - one of the highest we can make

Does MRI have ionising radiation

No

Advantages of MRI

No ionising radiation

Images can be in any 2D / 3D plane

Excellent tissue contrast

Lowest Volex

Negligible penetration effects

ferromagnetic

highly magnetically susceptible

Disadvantages of MRI

Slow

Expensive

Lots of patients have metal implants in the body and therefore can’t do an MRI

Tesla meaning

Strength unit of MRI

Resolution goes up with tesla

What is the head coil

detector

Use of diffusion MR

Detect unrecoverable tissue in strokes

Use of MR angiography

Image arteries

Use of MR spectroscopy

Estimate conc of a chemical in an areas in the brain - used for tumours

What makes MRI so different

soft tissue contrast

What structures can you see in an MRI

Bone

Muscle

Tenson

Artery

When is the magnet turned off

Only in emergency

Otherwise it is ALWAYS ON