On a T2-weighted MRI image, which signal is typically bright?

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Multiple Choice

On a T2-weighted MRI image, which signal is typically bright?

Explanation:
On a T2-weighted image, contrast is driven by T2 relaxation time. Fluids, which contain a lot of free water, have long T2 times, so their signals persist longer and appear bright. This makes water-containing tissues such as cerebrospinal fluid, edema, and other fluid-filled structures stand out as bright areas. In contrast, bone has a very short T2 and emits little signal, and air has essentially no signal, so they appear dark. Fat can be bright on T2 as well, but the hallmark bright signal on T2 is associated with fluids. Therefore, water-containing tissues are typically bright.

On a T2-weighted image, contrast is driven by T2 relaxation time. Fluids, which contain a lot of free water, have long T2 times, so their signals persist longer and appear bright. This makes water-containing tissues such as cerebrospinal fluid, edema, and other fluid-filled structures stand out as bright areas. In contrast, bone has a very short T2 and emits little signal, and air has essentially no signal, so they appear dark. Fat can be bright on T2 as well, but the hallmark bright signal on T2 is associated with fluids. Therefore, water-containing tissues are typically bright.

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