[Dynamic CT scan in cerebral infarction]

Forty-two dynamic CT studies were performed on 27 patients with cerebral infarction (11 to 75 years of age), and perfusion patterns of low density areas on plain CT were evaluated. The initial studies were performed 1.5 hours to 60 days after acute onset. In 14 patients, repeat studies were carried out to know how the perfusion pattern changes with time. All scannings were done on the level which includes anterior horns and trigones of lateral ventricle, thalamus, and internal capsules. CT scanners used were SIEMENS SOMATOM 2 and GE CT/T 8800. Procedures were as follows: 65% amidotrizomeglumin (1 ml/kg) was injected over 5 seconds through 18G needle placed in a antecubital vein. Injection of the contrast media was started with initiation of the second scanning. Totally 8 and 10 serial scans were performed, in SOMATOM 2 and CT/T 8800 respectively. Perfusion pattern is evaluated by comparing two time-density curves obtained from low density area on plain CT and the same region of contralateral side. The following results were obtained. The perfusion pattern in the low density area on plain CT varies among patients at any periods after onset, ranging from absent perfusion pattern to hyperfusion pattern. No consistent perfusion pattern was obtained at any given time after onset. Repeat dynamic CT revealed that the perfusion pattern in the low density area changed with time variously. The perfusion pattern or change of perfusion pattern did not correlate with outcome of the patient.(ABSTRACT TRUNCATED AT 250 WORDS)