Science Links Japan | A Contrast Enhancement and Scanning Techniques for CT Angiography of Head and Neck: One Phase Injection Method for Simultaneous Imaging of Vessels and Tumor.

A Contrast Enhancement and Scanning Techniques for CT Angiography of Head and Neck: One Phase Injection Method for Simultaneous Imaging of Vessels and Tumor.

Accession number;99A1045599

Title;A Contrast Enhancement and Scanning Techniques for CT Angiography of Head and Neck: One Phase Injection Method for Simultaneous Imaging of Vessels and Tumor.

Author; MORITA YASUHIKO (Kagoshima Univ., Dent. Sch.) INDO HIROKO (Kagoshima Univ., Dent. Sch.) NOIKURA TAKENORI (Kagoshima Univ., Dent. Sch.)

Journal Title;Dental Radiology

Journal Code:Z0608B

ISSN:0389-9705

VOL.39;NO.3;PAGE.159-167(1999)

Figure&Table&Reference;FIG.7, TBL.2, REF.12

Pub. Country;Japan

Language;Japanese

Abstract;We report on a method of CT-Angiography useful for examining lesion of the head and neck using three-dimensional images and measured CT value. This study focused on some of the important blood vessels in the head and neck. The aim of this method was to obtain high-contrast enhancement for both vessels and tumors at same time. A total amount of 100ml nonionic contrast media(Omnipaque 240, 240mg iodine per milliliter, Daiichi seiyaku, Tokyo, Japan) was injected intravenously with a flow of 1.5ml/sec. Spiral scans, 24 rotations with 24 seconds, were started at a time when remaining amount of contrast media had become 30 to 20ml. All CT scans were performed using double speed spiral scan technique with a slice thickness of 2 to 3mm and table speeds from 3 to 5mm/rotation. The patients populations consisted of 9 men and 6 women who ranged in age from 37 to 85 years. Sixteen CT-angiography were performed according to this method. Mean CT values of major blood vessels were measured in order to find out threshold at the level of submandibular gland in 13 examinations for 12 subjects. Important vessels like the common, internal, and the external artery, internal and external jugular vein were clearly visible in all subjects. Three dimensional images of these vessels could also be reconstructed for 15 of the subjects. Mean CT values were 211 Hounsfield units(HU) and 209HU for the right and left internal carotid artery, respectively, and 204HU and 206HU for the right and left external carotid artery, respectively. Mean CT values for right and left internal jugular vein were 195HU and 194HU respectively. Measured CT values at each important blood vessels showed this method could yields acceptable enhancements. Good enhancement effect of tumor and blood vessels in the same scan seems to be mutually incompatible. One very important trade-off is the early enhancement effect at blood vessels versus the late enhancement effect at tumors. (author abst.)

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