Fluid high signal

• Fat: high/intermediate signal.

• Mature haemorrhage (haemosiderin): low signal.

Fig. 6.1 Tl-weighted sagittal MRI image through the brain. Note the CSF is dark grey, fat is white and brain is mid-grey. Note also the large pituitary tumour.

Some tissues show low signal (black) on all sequences:

■ calcification,

■ tendons/ligaments,

The signal intensity from flowing blood is variable and depends on several factors including the sequence used, and the speed and direction of flow. On spin-echo (SE) images, flowing blood usually produces no signal (flow-void). Most pathological processes result in an increase in the water content of tissues, and they therefore tend to be most conspicuous, as areas of increased signal, on T2-weighted images.

Was this article helpful?

0 0
Reducing Blood Pressure Naturally

Reducing Blood Pressure Naturally

Do You Suffer From High Blood Pressure? Do You Feel Like This Silent Killer Might Be Stalking You? Have you been diagnosed or pre-hypertension and hypertension? Then JOIN THE CROWD Nearly 1 in 3 adults in the United States suffer from High Blood Pressure and only 1 in 3 adults are actually aware that they have it.

Get My Free Ebook

Post a comment