A technician called a sonographer conducts a carotid ultrasound with a little, handheld system referred to as a transducer. The transducer emits audio waves and data the echo as being the waves bounce off tissues, organs and blood cells. Tobacco use. Nicotine can irritate the internal lining of the arteries. https://www.sgvascularctr.com/revealing-the-latest-innovations-in-carotid-artery-disease-treatment/