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Related Experiment Videos

Positron tomography for ophthalmology.

M Itoh, M Kiyosawa, K Yamaguchi

    Japanese Journal of Ophthalmology
    |January 1, 1987
    PubMed
    Summary

    Positron emission tomography (PET) shows promise for diagnosing orbital tumors by assessing glucose metabolism. This imaging technique also reveals brain blood flow and metabolism, aiding in the detection of conditions like chronic cerebral ischemia.

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    Area of Science:

    • Nuclear medicine
    • Medical imaging
    • Oncology

    Background:

    • Positron emission tomography (PET) is utilized for tumor viability assessment and cerebral function analysis.
    • Preliminary findings indicate PET's potential in non-traumatic diagnosis of orbital tumors.

    Purpose of the Study:

    • To explore the utility of 18F-2-fluorodeoxyglucose (FDG) uptake in differentiating malignant orbital tumors.
    • To evaluate PET's capability in assessing cerebral blood flow, glucose metabolism, and oxygen consumption.
    • To compare PET's sensitivity against X-ray computed tomography (CT) and magnetic resonance CT for detecting lesions causing cortical hemianopsia.

    Main Methods:

    • Utilized 18F-2-fluorodeoxyglucose (FDG) PET imaging.
    • Assessed regional cerebral blood flow, glucose metabolism, and oxygen consumption.

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  • Compared PET findings with X-ray CT and magnetic resonance CT in patients with cortical hemianopsia.

    • Main Results:

    • FDG incorporation rate in orbital tissues correlated with malignancy.
    • PET provided insights into chronic cerebral ischemia, as observed in rubeosis iridis cases.
    • PET demonstrated higher sensitivity than CT and MRI in identifying lesions causing cortical hemianopsia.

    Conclusions:

    • PET imaging, particularly with FDG, offers a non-traumatic approach for orbital tumor diagnosis.
    • PET is valuable for evaluating brain metabolism and detecting cerebrovascular conditions.
    • PET surpasses conventional CT and MRI in diagnosing specific neurological lesions affecting vision.