Conspicuity of hepatic metastases on helical CT: effect of different time delays between contrast administration and scanning.
- 1 March 1995
- journal article
- research article
- Published by American Roentgen Ray Society in American Journal of Roentgenology
- Vol. 164 (3) , 619-623
- https://doi.org/10.2214/ajr.164.3.7863882
Abstract
The purpose of this study was to compare two time delays between injection of contrast material and helical CT scanning to determine relative conspicuity of hepatic metastases.Twenty-five patients with hepatic metastases were examined with helical CT. The first imaging phase was initiated at 50 sec and the second 75 sec after the start of contrast material injection (3 ml/sec, 150 ml). Differences in lesion and liver attenuation were measured quantitatively. Four radiologists used a 5-point scale to assess lesion conspicuity subjectively.Mean differences in enhancement between liver and lesion were 41 H during the first phase and 59 H for the second phase (p = .0001). Radiologists' conspicuity score averaged 2.4 for lesions in the first phase versus 3.3 for lesions in the second phase (p = .0001). In 56 (88%) of 64 lesions, objective measurements showed greater enhancement of lesions during the later phase. Radiologists found 60 (94%) of 64 lesions to be more conspicuous on these later images.Our results ...Keywords
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