An asymptomatic old patient presents with bruit in the carotid artery. Which of the following is the investigation of choice?
Doppler ultrasonography
Internal carotid angiography
Aortic arch angiography
Spiral CT angiography
Bruit over carotid artery suggests carotid artery stenosis.
Duplex scanning (B-mode scan and doppler ultrasonic velocimetry) is the method of choice for assessing the degree of carotid stenosis.