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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
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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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Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
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Structure - relaxivity relationships among targeted MR contrast agents.

Peter Caravan1, Zhaoda Zhang

  • 1A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, 149 Thirteenth St, Suite 2301, Charlestown, MA 02129, USA.

European Journal of Inorganic Chemistry
|June 30, 2012
PubMed
Summary

Researchers optimized gadolinium(III) contrast agents for magnetic resonance (MR) imaging by enhancing their relaxivity. This improvement allows for better image contrast and detection of molecular targets like serum albumin and fibrin.

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Area of Science:

  • Medical Imaging
  • Materials Science

Background:

  • Paramagnetic gadolinium(III) complexes are essential for enhancing contrast in magnetic resonance (MR) imaging.
  • Image contrast is determined by the gadolinium complex concentration and its relaxivity, a key property.
  • Higher relaxivity enables lower contrast agent concentration or imaging of more abundant molecular targets.

Purpose of the Study:

  • To understand and optimize the relaxivity of gadolinium(III) contrast agents.
  • To improve contrast enhancement in MR imaging.
  • To develop targeted contrast agents for specific biomolecules.

Main Methods:

  • Investigating the relationship between complex structure and relaxivity.
  • Analyzing water exchange kinetics (inner-sphere and second sphere).
  • Studying the impact of target binding on molecular dynamics.

Main Results:

  • Identified key structural and dynamic factors influencing relaxivity.
  • Demonstrated rational tuning of relaxivity for enhanced performance.
  • Summarized efforts in optimizing agents for serum albumin and fibrin targets.

Conclusions:

  • Relaxivity of gadolinium(III) complexes can be rationally tuned for improved MR imaging.
  • Optimized contrast agents show potential for detecting abundant molecular targets.
  • Targeted agents for serum albumin and fibrin represent a promising advancement in MR contrast enhancement.