HBG2 and hemorrhage: Based on the macroscopic hemorrhage literature, a possible reason is the development of methemoglobin that markedly decreases T1 relaxation time because of dipole-dipole interactions.15,36 Consequently, T1 shine-through may occur in SWI or T2* GRE images.18,19,32 In the present study, however, some arguments can be made against the development of methemoglobin as the explanation for microbleed signal void cessation.