• Fat: high/intermediate signal.
• Mature haemorrhage (haemosiderin): low signal.
Some tissues show low signal (black) on all sequences:
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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