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.

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