"radiology" Post in this tag
CXR
denser structures inside the chest wall
denser structures outside the chest wall
inside→ trachea, heart, aorta, diaphragm, PA(upper than PV) → mass, liquid
outside→ scapula, clavicle, vertebra, ribs → bone
radiology
HirotoShishido
fractional flow reserve
FFR
is a guide wire-based procedure that can accurately measure blood pressure and flow through a specific part of the coronary artery. FFR is done through a standard diagnostic catheter at the time of a coronary angiogram.
(percentage of blockage is not very accurate)
cardiovascular
radiology
HirotoShishido
TACE
適応の癌
(transcatheter arterial chemoembolization)
low or middle diffentiated hepatocellular carcinoma(arterial phaseに染まる癌)
high diffentiated carcinomaは門脈支配→radiofrequency ablation(RFA)
(山田龍作により開発される。和医大radiology departmentの二代前の教授)
radiology
IVR
HirotoShishido
embolic agents for catheter embolization
temporary→absorbable gelatin sponge(10-14days, cannot be used the patients with decreased coagulability)
permanent→coil, NBCA(N-butyl 2-cyanoacrylate, has to be mixed with lipiodol emulsion as contrast agent)
radiology
IVR
HirotoShishido
Picture
another possible findings
"golden S sign"(right upper lobe collapse+ hilar mass)
→squamous cell carcinoma
cavitation caused by necrosis(82%)
radiology
respiratory
HirotoShishido
Picture
"rib notching"
coarctation of the aorta
Takayasu disease(subclavian artery obstruction)
radiology
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
HirotoShishido
low intensity in T2WI
iron(hemosiderin=chronic hemorrhage), dioxyhemoglobin(acute hemorrhage),
calcification(CT is more sensitive), high protein, melanin, flow void
radiology
HirotoShishido
low intensity in both T1WI, T2WI
air, bone cortex, flow void
(calcification, iron, fibrosis)
radiology
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
HirotoShishido
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
HirotoShishido
ground glass opacities
non-specific sign with a wide etiology
including
opportunistic infection(e.g. pneumocystis,CMV,RSV)
chronic interstitial disease(interstitial pneumonia)
acute alveolar disease(ARDS)
respiratory
radiology
HirotoShishido
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