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Rationales for Non-standard GBCA Dosing-Low?-High?-When? and Why?: A Literature-based Study
Investigative Radiology
|January 8, 2026
Summary
For decades, researchers sought to reduce gadolinium-based contrast agent (GBCA) doses. New high-relaxivity agents offer a promising path to lower GBCA doses while maintaining image quality, potentially setting a new standard.
Area of Science:
- Radiology and Medical Imaging
- Pharmacology
- Biomedical Engineering
Background:
- The standard dose for gadolinium-based contrast agents (GBCAs) has remained unchanged for 40 years.
- Investigated non-standard dosing (higher and lower) of GBCAs for decades.
- Emergence of high-relaxivity macrocyclic GBCAs presents a viable low-dose alternative.
Purpose of the Study:
- Systematically review rationales for non-standard GBCA dosing.
- Discuss the future implications of high-relaxivity contrast agents.
Main Methods:
- Systematic literature review of Embase and MEDLINE/PubMED (1991-2024).
- Categorization by clinical indication, GBCA dose, study design, and rationale.
- Comparison against the standard dose of 0.1 mmol Gd/kg body weight.
Main Results:
- 87 publications analyzed: 43 high-dose and 58 low-dose studies.
- High-dose rationale: improved contrast (58%) and lesion detection (35%).
- Low-dose rationales evolved from cost and safety concerns (NSF, Gd exposure) to Gd retention and environmental impact.
Conclusions:
- Consistent demand to lower GBCA doses over 34 years with evolving rationales.
- High-relaxivity, low-dose macrocyclic GBCAs (mGBCAs) show potential.
- These agents may establish a new standard dose, balancing reduced Gd exposure with high image quality.
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