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Age-dependent decrease in the computed tomographic numbers of parotid and submandibular salivary glands.

M Ida, E Honda

    Dento Maxillo Facial Radiology
    |February 1, 1989
    PubMed
    Summary
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    Computed tomographic (CT) numbers in normal parotid and submandibular glands decrease significantly with age. This study quantifies the age-related decline in these salivary glands using Hounsfield units (HU).

    Area of Science:

    • Radiology
    • Medical Imaging
    • Anatomy

    Background:

    • Salivary gland imaging is crucial for diagnosing various conditions.
    • Computed tomography (CT) provides quantitative data on tissue density.
    • Understanding normal age-related changes in salivary glands is essential for accurate interpretation.

    Purpose of the Study:

    • To establish reference computed tomographic (CT) numbers for normal parotid and submandibular glands.
    • To investigate the influence of age on CT numbers in these glands.
    • To quantify the rate of age-related changes in salivary gland density.

    Main Methods:

    • Measurement of CT numbers (Hounsfield units) in 182 normal parotid glands (age 1-81 years) and 172 normal submandibular glands (age 1-85 years).
    • Analysis of CT data to determine mean values, standard deviations, and age-related trends.

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  • Statistical evaluation of sex and intra-individual differences.

    • Main Results:

    • Mean CT number for parotid glands: -10 +/- 24 HU.
    • Mean CT number for submandibular glands: 41 +/- 15 HU.
    • Significant linear decrease in CT numbers with increasing age observed in both parotid and submandibular glands, averaging a 0.5 HU annual decrease.

    Conclusions:

    • Age is a significant factor influencing the computed tomographic (CT) density of normal parotid and submandibular glands.
    • A consistent age-related decline in Hounsfield units (HU) is demonstrated.
    • These findings provide normative data for age-related changes in salivary gland CT density.