On a T1-weighted MRI image, which tissue is typically bright?

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Multiple Choice

On a T1-weighted MRI image, which tissue is typically bright?

Explanation:
On a T1-weighted image, signal intensity mainly reflects how quickly protons realign with the magnetic field after the excitation pulse. Fat has a short T1 relaxation time, so fat-rich tissues recover their longitudinal magnetization quickly and appear bright. Water-containing tissues have longer T1 times and look darker on T1 images, while air produces essentially no MR signal and appears dark, and dense bone also shows low signal due to few mobile protons. Because of these properties, fat-rich tissues are typically bright on T1.

On a T1-weighted image, signal intensity mainly reflects how quickly protons realign with the magnetic field after the excitation pulse. Fat has a short T1 relaxation time, so fat-rich tissues recover their longitudinal magnetization quickly and appear bright. Water-containing tissues have longer T1 times and look darker on T1 images, while air produces essentially no MR signal and appears dark, and dense bone also shows low signal due to few mobile protons. Because of these properties, fat-rich tissues are typically bright on T1.

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