Melanin is which signal intensity on T2?

Study for the Image Modalities Test. Learn with flashcards and multiple choice questions, each comes with hints and explanations. Get ready for your credentialing exam in the field of medical imaging!

Multiple Choice

Melanin is which signal intensity on T2?

Explanation:
Melanin has paramagnetic properties that shorten both T1 and T2 relaxation times. On T2-weighted MRI, shorter T2 means the tissue loses transverse magnetization more quickly, so its signal is reduced. In practice, melanin-containing tissues and pigmented lesions often appear hypointense, or very dark, on T2 images. This is in contrast to tissues without melanin, which are typically brighter on T2. So the expected signal for melanin on T2 is very dark (low signal), not bright.

Melanin has paramagnetic properties that shorten both T1 and T2 relaxation times. On T2-weighted MRI, shorter T2 means the tissue loses transverse magnetization more quickly, so its signal is reduced. In practice, melanin-containing tissues and pigmented lesions often appear hypointense, or very dark, on T2 images. This is in contrast to tissues without melanin, which are typically brighter on T2. So the expected signal for melanin on T2 is very dark (low signal), not bright.

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