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A novel iodine-free digital subtraction angiography (DSA) uses bismuth (Bi)-DTPA Dimeglumine for vascular imaging. This new contrast agent offers clear visualization and is suitable for patients with contraindications to iodine-based agents.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Materials Science

Background:

  • Digital subtraction angiography (DSA) is the standard for diagnosing vascular diseases.
  • Current DSA relies on iodine (I)-based contrast agents, posing risks for patients with contraindications.
  • There is a need for alternative, safe, and effective contrast agents for DSA.

Purpose of the Study:

  • To introduce and evaluate an iodine-free DSA using a bismuth (Bi) chelate, Bi-DTPA Dimeglumine, for vascular visualization.
  • To assess the imaging capabilities, biocompatibility, and diagnostic utility of Bi-DTPA Dimeglumine in preclinical models.

Main Methods:

  • Synthesis and characterization of Bi-DTPA Dimeglumine.
  • Performance evaluation of Bi-DTPA Dimeglumine-enhanced DSA in rabbit models (head, lower limbs).
  • Comparison of Bi-DTPA-enhanced DSA with iodine-based contrast agents (iopromide).
  • Assessment in a rabbit model of thrombotic disease.

Main Results:

  • Bi-DTPA Dimeglumine demonstrated a simple synthesis, large-scale production potential, and good biocompatibility.
  • Bi-DTPA-enhanced DSA provided clear visualization of arteries with a minimum vascular resolution of 0.5 mm.
  • Superior visualization of terminal vessel integrity compared to iopromide-enhanced DSA.
  • Successful detection of embolism and evaluation of recanalization therapy in a thrombotic disease model.

Conclusions:

  • Iodine-free DSA using Bi-DTPA Dimeglumine is feasible and effective for vascular visualization.
  • Bi-DTPA Dimeglumine offers a promising alternative contrast agent for DSA, especially for patients with contraindications.
  • This approach provides a universal method for diagnosing vascular diseases.