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Hepatic contrast agents for computed tomography: high atomic number particulate material

S E Seltzer, D F Adams, M A Davis

    Journal of Computer Assisted Tomography
    |June 1, 1981
    PubMed
    Summary

    New high atomic number particulate contrast agents show promise for computed tomography (CT) liver imaging. These agents offer enhanced radiopacity and selective liver biodistribution, potentially improving lesion detection.

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    Area of Science:

    • Radiology
    • Materials Science
    • Biomedical Engineering

    Background:

    • Computed tomography (CT) requires effective contrast agents for accurate liver imaging.
    • Standard iodinated contrast agents have limitations in dose, toxicity, and biodistribution.
    • Development of novel contrast agents with enhanced properties is crucial.

    Purpose of the Study:

    • To identify, design, synthesize, and test novel high atomic number particulate contrast agents for CT.
    • To achieve high radiopacity and selective biodistribution to the normal liver.
    • To reduce contrast agent dose and minimize toxicity.

    Main Methods:

    • A stepwise approach was used for agent development and testing.
    • Evaluated suspensions of cerium, gadolinium, and dysprosium oxide particles, and silver iodide colloid.

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  • Compared experimental agents with standard iodinated agents in rat and rabbit models.

    • Main Results:

    • All four experimental agents concentrated selectively in the reticuloendothelial system.
    • Experimental agents provided greater and longer liver opacification than standard agents.
    • Demonstrated larger liver-to-tumor differences in rabbits with hepatic tumors, enabling visualization of 5 mm lesions.

    Conclusions:

    • Experimental high atomic number particulate agents exhibit favorable characteristics for hepatic CT contrast.
    • These agents offer improved opacification and lesion detection compared to standard agents.
    • Potential clinical utility may be limited by toxicity and long-term retention concerns.