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Quantifying Mixing using Magnetic Resonance Imaging

Quantifying Mixing using Magnetic Resonance Imaging

Published on: January 25, 2012

Nanoshell magnetic resonance imaging contrast agents.

Chia-Hao Su¹, Hwo-Shuenn Sheu, Chia-Yun Lin

¹Department of Chemistry and Center for Micro/Nano Science and Technology and Institute of Oral Medicine and Molecular Medicine, National Cheng Kung University, Tainan 701, Taiwan.

Journal of the American Chemical Society

|February 1, 2007

Summary

Gold and copper nanoshells act as effective nanocontrast agents for magnetic resonance (MR) imaging, enhancing blood vessel visibility. These novel agents show potential for MR angiography with good in vivo safety profiles at low doses.

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Area of Science:

Biomedical Engineering
Materials Science
Nanotechnology

Background:

Nanocontrast agents are crucial for advancing magnetic resonance (MR) molecular imaging in clinical diagnostics.
Developing novel agents with enhanced contrast properties and safety is an ongoing research area.

Purpose of the Study:

To synthesize and evaluate gold and copper (Au(3)Cu(1)) nanoshells as novel nanocontrast agents for MR imaging.
To investigate the in vitro and in vivo performance of Au(3)Cu(1) nanoshells, including their contrast enhancement capabilities and cytotoxicity.

Main Methods:

Synthesis of Au(3)Cu(1) nanoshells.
In vitro MR imaging to assess T(1)-weighted and T(2) contrast effects at varying concentrations.
In vivo MR imaging for evaluating blood vessel enhancement and potential as blood-pool agents.
Cytotoxicity and animal survival assays to determine safety profiles.

Main Results:

Au(3)Cu(1) nanoshells demonstrated significant MR contrast enhancement, brightening T(1)-weighted images due to high proton r1 relaxivities.
A proton-dephasing effect was observed in T(2) imaging, with signal reduction at higher concentrations.
In vivo imaging showed enhanced contrast in blood vessels, indicating potential for MR angiography.
Cytotoxicity assays revealed a dose-dependent toxic effect, with high survival rates at lower doses (2 mg kg(-1)).

Conclusions:

Au(3)Cu(1) nanoshells exhibit promising MR contrast properties, attributed to nanoparticle form and porous hollow morphology enhancing relaxivity.
These nanoshells show potential as blood-pool agents for MR angiography.
The nanocontrast agents demonstrate a favorable safety profile at clinically relevant doses, warranting further investigation.