[Contrast-enhanced CT of the mediastinum in lymph node diagnosis].
In mediastinal lymphoadenopathy diagnostic problems arise if lymphomas are of the same density as cardial or vascular structures. For this reason, CT based on contrast enhancement must definitely ensure a significantly greater enhancement of vascular structures than of non-vascular ones during the entire scan period. We studied 4 groups of 20 patients each employing standardised CT examinations employing 100 ml. contrast medium in different concentrations (200 and 300 mg. iodine/ml., respectively) and an injection flow rate of 0.7 and 2.0 ml/s. The results show that higher iodine concentrations produce a significantly greater enhancement in the aorta than a lower iodine concentration independent of the flow rate. Although a lower flow rate slightly delayed the enhancement increase, this was nevertheless higher than 60 HU within a period of 4 minutes. Hence, we recommend to perform contrast enhanced CT of the mediastinum using lower flow rates (0.5-1.0 ml/s.) and a higher contrast medium concentration (300 mg. iodine/ml.).
Hahn
C
C
Radiologisches Institut, Katharinenhospital, Stadt Stuttgart.
Weiske
R
R
Arlart
I P
IP
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media; D006801:Humans; D007479:Iopamidol; D008198:Lymph Nodes / Q000000981:diagnostic imaging / Q000473:pathology*; D008482:Mediastinum / Q000000981:diagnostic imaging / Q000473:pathology*; D008875:Middle Aged; D014057:Tomography, X-Ray Computed
D003287:Contrast Media; D007479:Iopamidol
Kontrastmittel-CT des Mediastinums zur Lymphknotendiagnostik.