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CT in silicosis: correlation with plain films and pulmonary function tests.

C J Bergin, N L Müller, S Vedal

    AJR. American Journal of Roentgenology
    |March 1, 1986
    PubMed
    Summary

    Computed tomography (CT) accurately assesses silicosis extent visually, correlating well with standard classifications. However, lung function decline in silicosis patients is linked to emphysema, not nodule profusion, which CT also detects.

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    Residential greenness is differentially associated with childhood allergic rhinitis and aeroallergen sensitization in seven birth cohorts.

    Allergy·2016

    Area of Science:

    • Pulmonary Medicine
    • Radiology
    • Occupational Health

    Background:

    • Silicosis is a serious lung disease caused by silica dust inhalation.
    • Accurate assessment of silicosis extent and associated lung conditions is crucial for patient management.
    • Computed tomography (CT) offers detailed imaging but its role in silicosis assessment requires clarification.

    Purpose of the Study:

    • To evaluate the effectiveness of computed tomography (CT) for both qualitative and quantitative assessment of silicosis.
    • To compare CT findings with chest radiographs and pulmonary function tests.
    • To determine the relationship between lung function, silicosis, and emphysema.

    Main Methods:

    • CT scans, chest radiographs, and pulmonary function tests were performed on 17 silicosis patients and 6 controls.

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  • CT scans were evaluated visually and by mean attenuation values for silicosis extent.
  • Emphysema extent was also assessed, and CT findings were correlated with ILO classification and lung function.

    • Main Results:

    • Visual CT grading of silicosis showed significant correlation with the ILO profusion category (r > 0.84, p < 0.001) and was highly reproducible.
    • Mean CT attenuation values also correlated with silicosis extent (r > 0.62, p < 0.001), but were less reliable.
    • Pulmonary function tests correlated poorly with silicosis nodule profusion but significantly with CT-assessed emphysema (FEV1% predicted: r > 0.66; diffusing capacity: r > 0.71).

    Conclusions:

    • Visual CT assessment of silicosis extent is accurate and reproducible, complementing chest radiography.
    • CT effectively detects emphysema associated with silicosis, which impacts lung function.
    • Reduced lung function in silicosis patients is primarily associated with emphysema, not the degree of silicosis nodules.