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[Bolus geometry in various central and peripheral contrast medium applications: study with serial CT using non-ionic
Rontgen-Blatter; Zeitschrift Fur Rontgen-Technik Und Medizinisch-Wissenschaftliche Photographie
|July 1, 1985
Summary
This study measured contrast medium bolus concentrations and half-lives in patients undergoing CT angiography. Results show variations based on injection site, with implications for vascular imaging interpretation.
Area of Science:
- Radiology
- Medical Imaging
- Vascular Imaging
Background:
- Accurate assessment of contrast medium dynamics is crucial for interpreting vascular imaging studies.
- Understanding bolus characteristics aids in optimizing imaging protocols and diagnostic accuracy.
Purpose of the Study:
- To quantify intravasal contrast medium bolus concentrations and half-lives in patients undergoing CT angiography.
- To investigate the influence of injection site (central vs. peripheral) on contrast bolus parameters.
Main Methods:
- Utilized a calibrated CT scanner (Serio-CT) for measurements in 27 patients.
- Administered 40 ml of nonionic contrast medium (Iohexol, 350 mg I/ml).
- Performed invasive measurements at the common carotid artery, iliac artery, and aortic bifurcation.
Main Results:
- Maximum concentrations varied: ~23 mg I/ml (carotid, central), ~14 mg I/ml (iliac, peripheral), and 12.5 mg I/ml (aortic bifurcation, peripheral).
- Average bolus half-lives were: 9.5 sec (carotid), 11.5 sec (iliac), and 7 sec (aortic bifurcation).
- No significant differences in bolus geometry were observed between arterial and superior vena cava injections, or with varying peripheral injection speeds.
Conclusions:
- Injection site significantly impacts contrast medium bolus concentration and half-life in CT angiography.
- Observed vascular effects, potentially due to contrast-induced vasodilation, may explain these dynamics.
- Findings contribute to a better understanding of contrast delivery in vascular imaging.