Investigation of choice for screening of proximal internal carotid aery stenosis is :: (A) Doppler flow USG, (B) CT substraction angiography, (C) MRI, (D) Angiography (DSA)
Answer is A. Answer is A (Doppler flow USG): 'Stenosis at the origin of the internal carotid Aery can be identified and quantified reliably by ultrasonography that combines B mode ultrasound image with a Doppler ultrasound assessment of flow velocity.'