Keywords:
Tissue characterisation, Contrast agent-intravenous, CT, Contrast agents, Cardiac
Authors:
R. W. van Hamersvelt, M. J. Willemink, A. Schilham, P. A. de Jong, T. Leiner; Utrecht/NL
Results
Excellent reproducibility was found for all scan repetitions at both 120 and 140 kVp (ICCs>0.99,
CI 0.99-0.99).
Correlation between measured and true gadolinium concentrations was excellent (R>0.99,
P<0.001; ICCs>0.99,
CI 0.99-0.99).
All measurement were overestimated at 120 kVp with a mean measurement error of 0.7±0.7 mg/mL (9.6±7.2%).
At 140 kVp measurements were over- and underestimated with a mean measurement error of -0.0±0.2 mg/mL (0.7±5.1%) and absolute measurement error of 0.1±0.2 mg/mL (3.0±4.1%).
Measurement errors at 140 kVp were significantly lower than measurements errors at 120 kVp.
Measurement errors per concentrations ranged from 0.1 to 2.4 mg/mL at 120 kVp and from -0.4 to 0.5 mg/mL at 140 kVp (Fig. 3).
In the control tube (0 mg/mL gadolinium) no measurement error was found (0.0±0.0 mg/mL).
At both 120 and 140 kVp a maximum measurement error of 0.1 mg/mL was found at the lowest gadolinium concentrations.