A Comprehensive Review of Physicochemical Properties Influencing the Magnetic Behavior and Relaxivity of Nanoparticle-Based MRI Contrast Agents
-
Reza Malekzadeh
,
Ramin Ghasemi Shayan
,
Amir Ghasemi Jangjoo
,
Masoumeh Khani
,
Shabnam Soleimani
,
Amin Pourfarshid
,
Tohid Mortezazadeh
,
Mikaeil Molazadeh
Abstract
Purpose: This review aimed to comprehensively assess how various physicochemical properties of nanoparticle-based MRI contrast agents—such as size, concentration, surface coating, charge, pH-responsiveness, and surface functionalization—affect their magnetic behavior and relaxivity. Moreover, this study evaluated the synergistic effects of these parameters to provide an integrated understanding of their combined impact on imaging performance.
Materials and Methods: A systematic search was conducted across PubMed, Scopus, Web of Science, and IEEE Xplore for studies published between 2015 and 2025. Search terms included combinations of “MRI contrast agents,” “nanoparticles,” “particle size,” “surface coating,” “surface charge,” “polymer type,” “relaxivity,” “drug delivery,” and “circulation time.” The search strategy used Boolean operators (AND, OR), Medical Subject Headings (MeSH), and filters for English-language, peer-reviewed, experimental articles. Inclusion criteria focused on original studies assessing how size, surface characteristics (charge, polymer, pH responsiveness), and concentration affect MRI relaxivity and imaging performance. Data were extracted and synthesized to evaluate trends, thresholds, and correlations among parameters.
Results: The review identified that nanoparticle size below 20 nm significantly enhances T₁ relaxivity, while concentrations above 0.5 mg/mL often lead to signal quenching and increased cytotoxicity. Surface coatings such as PEG and silica were found to improve biocompatibility and alter magnetic response depending on thickness and binding chemistry. Notably, the synergistic effects among these parameters were highlighted, demonstrating that optimized combinations of size, concentration, and surface coating could significantly enhance magnetic behavior and relaxivity, offering a more accurate and efficient MRI performance. This review identified threshold values for key nanoparticle properties—such as size, concentration, and surface coating—that significantly influence MRI relaxivity and imaging performance, providing a clear understanding of their combined effects.
Conclusion: This review highlights that optimizing the design of nanoparticle-based MRI contrast agents requires a synergistic approach, where key parameters—size, concentration, surface coating, and surface functionalization—are co-engineered to enhance magnetic behavior and relaxivity. Specifically, maintaining particle sizes below 20 nm, using biocompatible coatings like PEG or silica, and optimizing concentration between 0.1–0.5 mg/mL were identified as critical factors. This integrated framework provides a guideline for developing next-generation contrast agents with superior imaging performance and minimal toxicity.
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| Files | ||
| Issue | Vol 12 No 4 (2025) | |
| Section | Systematic Review(s) | |
| DOI | https://doi.org/10.18502/fbt.v12i4.19828 | |
| Keywords | ||
| Nanoparticle Magnetic Resonance Imaging Contrast Agents Particle Size Surface Charge Surface Coating Polymer Type pH-Responsive Release Concentration Relaxivity Drug Delivery Blood Circulation Time Targeted Imaging | ||
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How to Cite
1.
Malekzadeh R, Ghasemi Shayan R, Jangjoo AG, Khani M, Soleimani S, Pourfarshid A, Mortezazadeh T, Molazadeh M. A Comprehensive Review of Physicochemical Properties Influencing the Magnetic Behavior and Relaxivity of Nanoparticle-Based MRI Contrast Agents. Frontiers Biomed Technol. 2025;12(4):918-940.
