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Strategies for calculating contrast media dose for chest CT
Mette Karen Henning1,2, Catherine Gunn3, Juan Arenas-Jiménez4,5,6
1Faculty of Health Sciences, Department of Life Sciences and Health, Oslo Metropolitan University, Oslo, Norway.
European Radiology Experimental
|June 11, 2023
Summary
Bioelectrical impedance analysis (BIA) offers a more personalized contrast media (CM) dose for enhanced CT scans. This method better accounts for patient body composition, especially in muscular or overweight individuals, improving dose accuracy.
Area of Science:
- Radiology
- Medical Imaging
- Diagnostic Imaging
Background:
- Total body weight (TBW) is a common but suboptimal method for contrast media (CM) dose calculation in enhanced CT.
- It fails to account for individual patient characteristics like body fat percentage (BFP) and muscle mass.
- Alternative CM dosage strategies are needed for improved accuracy.
Purpose of the Study:
- To analyze the impact of CM dose adjustment based on body composition using lean body mass (LBM) and body surface area (BSA) methods.
- To correlate CM doses with demographic factors in contrast-enhanced chest CT examinations.
- To evaluate the adaptability of different LBM calculation methods to patient body habitus.
Main Methods:
- Retrospective analysis of 89 adult patients undergoing CM thoracic CT, categorized by body habitus (normal, muscular, overweight).
- Calculation of CM dose using LBM (James method, Boer method, bioelectrical impedance analysis - BIA) and BSA (Mostellar formula).
- Correlation of calculated CM doses with patient demographic factors.
Main Results:
- BIA demonstrated the widest range of CM dose calculations, with the highest in muscular and lowest in overweight groups.
- For the normal group, TBW yielded the lowest calculated CM dose.
- The BIA method showed the strongest correlation between calculated CM dose and BFP.
Conclusions:
- The BIA method is highly adaptive to variations in patient body habitus, particularly in muscular and overweight individuals.
- BIA-based LBM calculation shows the strongest correlation with patient demographics.
- Utilizing BIA for LBM calculation may support tailored CM dose protocols for enhanced chest CT.
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