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In brain death,the pericallosal and terminal arteries of the cortex did not opacify during the two phases of spiral CT,whereas the superficial temporal arteries were always visible.The internal cerebral veins,the great cerebral vein,and the straight sinus did not opacify,whereas the superior opthalmic veins were visible on both sides 13 times.For each vessel type,specificity was 100%for nonvascular opacification criteria on the right and left sides.Two-phase spiral CT can demonstrate the absence of intracerebral blood flow in brain death. |
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