Blood (methemoglobin in subacute hemorrhage) on T2 is which signal intensity?

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

Blood (methemoglobin in subacute hemorrhage) on T2 is which signal intensity?

Explanation:
When blood products evolve after hemorrhage, their MRI appearance changes with time. In the subacute stage, methemoglobin forms and becomes the dominant breakdown product. Its presence makes the lesion appear bright on T2-weighted images. This contrasts with the acute phase, where deoxyhemoglobin can make T2 darker, and with the chronic phase, where hemosiderin can cause dark signal on T2*, depending on the sequence. So, subacute blood with methemoglobin shows bright signal on T2.

When blood products evolve after hemorrhage, their MRI appearance changes with time. In the subacute stage, methemoglobin forms and becomes the dominant breakdown product. Its presence makes the lesion appear bright on T2-weighted images. This contrasts with the acute phase, where deoxyhemoglobin can make T2 darker, and with the chronic phase, where hemosiderin can cause dark signal on T2*, depending on the sequence. So, subacute blood with methemoglobin shows bright signal on T2.

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