The more convenient position of the investigator is generally behind the patient but, in daily practice, can be used also a position next to the patient.
A linear transducer frequency of 7-10 MHz. is the most used, allowing for high resolution image, while a convex transducer frequency of 2-3 MHz can be employed in the study of deeper vessels (study of the origin of the right common carotid artery and of the distal internal carotid arteries).
With longitudinal scan we explore the neck, starting from the clavicle and then proceed cranially to the carotid bulb, internal and external carotid arteries. Longitudinal scan is used for an evaluation of the intima-media thickness and plaque.
Transverse scan is used to explore the course and the caliber of the vessels and the degree stenosis in area. Generally, the internal carotid artery differs from external carotid artery because has larger caliber and is located posteriorly and laterally.
In this lesson the methodology of the echocolor Doppler study of the carotid artery is presented.
Franco Accorsi, MD
Member of the Order of Physician of Bologna n° 6728
I am a specialist in Medical Angiology and I am based in Bologna, Italy. Until 2008 (voluntary resignation) I worked at Maggiore Hospital in Bologna as "Dirigente Medico" in the Department of Internal Medicine and as Angiologist in the Angiology Unit with a position of "Alta Professionalità" in "Vascular Ecography and Angiology".
I am currently working in Bologna as an independent professional in the areas of angiology and vascular diagnostics.
I have been a speaker at national and international courses/congress and I have taught duplex ultrasound method in GIUV and SIUMB courses at the Maggiore Hospital, Bologna and courses of echocolor Doppler of extracranial and intracranial arteries at the Stroke Unit of S. Maria Nuova Hospital, Reggio Emilia.