Abstract
The real-time-B-scan is utilized to detect a sclerosis or thrombotic stenosis of the carotid artery. This method was applied to determine whether a radical neck dissection was indicated or not for arresting to the cervical lymph nodes in cases of head and neck carcinoma. The procedure of the scan was undertaken as follows; i) transverse scan for detecting the internal jugular vein, external-, internal-carotid artery and common carotid artery, in addition to detecting the cervical mass, ii) longitudinal scan for clarifying the nature of the vessel walls, such as tapering, compression, invasion or shifting, iii) scan during swallowing, for detecting the paradoxical or coordinating movement adjacent to the mass and the vessels, iv) scan in setting a position of Valsalva's maneuver.
