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Related Experiment Videos

Ventilation imaging with Kr-81m. A comparison with Xe-133

T R Miller, D R Biello, J I Lee

    European Journal of Nuclear Medicine
    |January 1, 1981
    PubMed
    Summary

    This study compared Krypton-81m (Kr-81m) and Xenon-133 (Xe-133) ventilation imaging for diagnosing pulmonary embolism. While generally agreeing, Kr-81m showed differences in 2 cases, warranting further trials before routine use.

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    Analysis of the number of enlarged pores according to site, age, and sex.

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    Area of Science:

    • Nuclear Medicine
    • Diagnostic Imaging
    • Cardiopulmonary Medicine

    Background:

    • Pulmonary embolism (PE) diagnosis relies on imaging, with ventilation-perfusion (V/Q) scintigraphy being a key tool.
    • Different radioactive gases, such as Xenon-133 (Xe-133) and Krypton-81m (Kr-81m), are used for ventilation imaging in V/Q scans.
    • Assessing the comparative diagnostic accuracy and clinical utility of these agents is crucial for optimizing PE detection.

    Purpose of the Study:

    • To prospectively compare the diagnostic performance of Kr-81m and Xe-133 ventilation imaging in patients with suspected pulmonary embolism.
    • To evaluate the agreement between Kr-81m and Xe-133 ventilation imaging when used alongside Tc-99m MAA perfusion imaging and chest radiography.
    • To determine if Kr-81m ventilation imaging is suitable for routine clinical use in the diagnosis of PE.

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    Main Methods:

    • Prospective study of 65 patients with suspected pulmonary embolism.
    • Utilized both Kr-81m and Xe-133 for ventilation imaging, and Tc-99m MAA for perfusion imaging.
    • Independent interpretation of imaging studies (including chest radiographs) by three observers.

    Main Results:

    • Fifty-three patients showed normal or low/intermediate probability for PE with both ventilation agents.
    • One patient had intermediate probability with Xe-133 (retention) but low probability with Kr-81m (good V/P match).
    • Nine patients had high probability for PE with both gases; two additional patients had high probability only with Kr-81m.

    Conclusions:

    • Essential agreement was observed between Xe-133 and Kr-81m ventilation imaging in most patients.
    • Discrepancies in interpretation occurred in 2 of 11 patients with probable PE, highlighting potential differences.
    • A controlled trial with pulmonary angiography is recommended before adopting Kr-81m for routine clinical PE diagnosis.