"radiology" Post in this tag
high signal in diffusion weighted imaging
ischemic stroke
brain abscess(ring enhancementが見られた時にglioblastoma, brain metastasisから鑑別のためにDWI用いる)
膿は拡散が低下するので高信号
radiology
Sep 17, 2019, 10:49 PM
HirotoShishido
low intensity in T2WI
iron(hemosiderin=chronic hemorrhage), dioxyhemoglobin(acute hemorrhage),
calcification(CT is more sensitive), high protein, melanin, flow void
radiology
Sep 17, 2019, 10:42 PM
HirotoShishido
low intensity in both T1WI, T2WI
air, bone cortex, flow void
(calcification, iron, fibrosis)
radiology
Sep 17, 2019, 10:34 PM
HirotoShishido
T1WI T2WI high intensity
T1→ ☆fat, ☆high protein(posterior pituitary), ☆methemoglobin(subacute hemorrhage),
melanin(melanoma), paramagnetic cation(kˈætὰɪən)(Mn, Gd→basal ganglia, contrast media)
T2→ fat, methemoglobin, water(,edema, tumor)
radiology
Sep 17, 2019, 2:57 AM
HirotoShishido
chest X-ray, CT effective radiation dose
natural background radiation
chest X-ray 0.1mSv
CT(abdomin,pelvis) 10mSv
natural 2.5mSv/year (world average)
radiology
Sep 16, 2019, 10:48 PM
HirotoShishido