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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Updated: Sep 11, 2025

MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent

MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent

Published on: September 3, 2013

Liver-Directing Fe(III)-Based MRI Contrast Agent.

Geetanjali Deka¹, Arisha Arora², Priyanka Bhat³

¹Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.

Small (Weinheim an Der Bergstrasse, Germany)

|August 13, 2025

Summary

This summary is machine-generated.

Researchers developed a new, safe iron-based contrast agent for liver MRI. Encapsulated in silica nanoparticles, it enhances image clarity and shows promise for early liver cancer detection, replacing unsafe gadolinium agents.

Keywords:

MRI contrast agents hepatocellular carcinoma iron complex magnetic resonance imaging porous silica nanoparticle

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Area of Science:

Biomedical imaging
Nanotechnology
Materials Science

Background:

Liver cancer is a leading cause of cancer mortality.
Current gadolinium-based contrast agents (CAs) for liver MRI raise safety concerns.
There is a need for safer, non-gadolinium liver-specific CAs.

Purpose of the Study:

To develop a biocompatible, non-Gd-based liver-directing contrast agent for MRI.
To enhance the relaxivity and cellular uptake of a novel iron(III)-complex.
To evaluate the efficacy of the developed agent in preclinical liver imaging.

Main Methods:

Encapsulation of a paramagnetic Fe(III)-complex (1) within porous silica nanoparticles (18 nm).
Surface functionalization of nanoparticles with p-methoxybenzamide (C1@SiO2-PMBA-NP).
Assessment of longitudinal relaxivity (r1) and serum albumin interaction.
In vitro cell internalization studies (HepG2 cells) and preclinical MRI in C57BL/6 mice.

Main Results:

Entrapment significantly boosted the relaxivity of Complex 1 by 9 times.
Relaxivity further increased in the presence of serum albumin.
C1@SiO2-PMBA-NP demonstrated efficient HepG2 cell internalization.
Preclinical MRI showed time-dependent contrast enhancement in the liver.

Conclusions:

The developed C1@SiO2-PMBA-NP is a promising biocompatible, liver-directing T1-weighted contrast agent.
This non-Gd-based agent offers a safer alternative for liver MRI.
The study validates the potential for early liver abnormality detection using this novel nanomaterial.