Paramagnetic Contrast: Hemorrhage
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I have included the topic "Hemorrhage" under the larger heading titled "Paramagnetic Contrast" because the appearance of blood products on MRI are dominated by the paramagnetic properties of hemoglobin during various stages of evolution.
Hemorrhage Q&A's
- The appearance of hemorrhage on MRI seems very complicated. Can you simplify it?
- What are the different forms of hemoglobin and why do they have different magnetic properties?
- What does fresh (hyperacute) hemorrhage look like on MRI?
- Why does acute hemorrhage become dark on T2-weighted images?
- Why is methemoglobin bright on T1-weighted images?
- If deoxy-Hb loses an electron to form met-Hb, why is met-Hb more paramagnetic?
- Why do the imaging properties change depending on whether methemoglobin is intracellular vs extracellular?
- Can you explain the appearance of old/chronic hematomas on MRI?
- What happens after the met-Hb stage and how do these later degradation products affect the MR signal?
- What is ferritin? How is it different from hemosiderin?
- How does the appearance of subarachnoid hemorrhage differ from parenchymal hemorrhage on MRI?
Hemorrhage Topics