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[Digital subtraction dacryocystography and sialography].

Fourteen examinations of the tear ducts and 21 sialograms were performed using digital subtraction and conventional techniques. In nine of the former and 15 of the latter, digital subtraction produced better results, in the remainder conventional technique was equally good. The advantages of digital subtraction are due to the removal of superimposed structures of the skull. Dose measurements at the level of the lens of the eye showed a greatly reduced radiation dose when using digital subtraction, as compared with conventional dacryocystography. Digital subtraction techniques with pulsed radiation and the ability to perform pixel shift is an optimal method for performing radiological examinations of the tear ducts and salivary glands.

Humans↗

Sialography.

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Child↗

Sialography.

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Humans↗

Parotid CT sialography.

Computed tomographic (CT) scanning of the parotid gland during the injection of water-soluble contrast medium allows precise mapping of the gland's parenchyma and of any filling defects or extrinsic masses. Thirty-six patients were examined in this way. The most valuable information that was gained was the differentiation of extrinsic and intrinsic tumors and an accurate appraisal of the location of the facial nerve with respect to intrinsic parotid lesions. In the majority of patients the diagnosis of benign or malignant tumor is suggested by the patterns of tumor growth. Inflammatory disease shows diminution in the amount of parotid parenchyma in relationship to interstitial tissues, but the appearance is not sufficiently characteristic for definitive diagnosis.

Chronic Disease↗