Based on your particular situation, your carotid artery might need a Doppler ultrasound, a specialised ultrasound test that measures how effectively blood flows by blood vessels. A Doppler ultrasound provides graphs of blood stream rather then pictures. The symptoms of the ministroke generally final for one particular to 2 hours. https://www.sgvascularctr.com/treating-carotid-artery-disease-an-overview-of-treatment-options-in-singapore/