text: <unk> /doppler study of the carotid arteries can be used to detect carotid stenosis or dissection of the precerebral arteries.
option_0: Ischemic stroke ultrasound
option_1: Ischemic stroke MRI
option_2: Carotid artery stenosis electrocardiogram
option_3: Ischemic stroke CT
option_4: Ischemic stroke echocardiography
option_5: Ischemic stroke physical examination
option_6: Thrombophilia physical examination
option_7: Peripheral neuropathy electrocardiogram