MRI of Intracranial Hemorrhage

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To appreciate the MR appearance of hemorrhage in the brain, the radiologist needs to be conversant with two paramagnetic phenomena that are seen only in MRI because of unpaired electrons.1 These paramagnetic phenomena are the dipole—dipole interactions, which shorten T1 (like gadolinium), and the magnetic susceptibility effects, which shorten T2 and T2*. T1 shortening is appreciated as high signal on short TR-short TE T1-weighted images (Figure 1). Magnetic susceptibility effects, on the other hand, lead to T2 and T2* shortening, which causes low signal on long TR-long TE T2-weighted images and T2*-weighted gradient echo (GRE) images (Figure 2), respectively.

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