MRV Head Without and With IV Contrast There is no relevant literature to support the use of MR venography (MRV) of the head in the evaluation of TIA in the absence of suspicion of CVT, which can rarely present as a TIA [37]. MRV Head Without IV Contrast There is no relevant literature to support the use of MRV of the head in the evaluation of TIA in the absence of suspicion of CVT, which can rarely present as a TIA [37]. US Duplex Doppler Carotid Artery Ultrasound (US) duplex carotid Doppler is a useful test in the initial evaluation of the extracranial vasculature in the workup of TIA. Carotid Doppler US is noninvasive and is accurate in evaluating the degree of carotid stenosis [38]. Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with TIA or minor stroke who are candidates for CEA or stenting within 48 hours of onset [12]. US Duplex Doppler Transcranial Transcranial Doppler can be used for the detection of microembolic events and in the detection of intracranial vascular pathology in the secondary workup of TIA. However, this is not typically used as an initial imaging test in the setting of TIA. Arteriography Cervicocerebral Cerebral angiography has the highest spatial and temporal resolution of any vascular imaging study. Due to the invasive nature of catheter-directed angiography, other modalities are typically preferred in the initial workup for stroke. However, in the setting of highly suspected LVO with no need for perfusion imaging or MRI to determine eligibility for EVT, initial catheter angiography after noncontrast CT may be the preferable vascular imaging study due to the ability to rapidly convert a diagnostic catheter angiogram to EVT [53,54].
Cerebrovascular Diseases Stroke and Stroke Related Conditions PCAs. MRV Head Without and With IV Contrast There is no relevant literature to support the use of MR venography (MRV) of the head in the evaluation of TIA in the absence of suspicion of CVT, which can rarely present as a TIA [37]. MRV Head Without IV Contrast There is no relevant literature to support the use of MRV of the head in the evaluation of TIA in the absence of suspicion of CVT, which can rarely present as a TIA [37]. US Duplex Doppler Carotid Artery Ultrasound (US) duplex carotid Doppler is a useful test in the initial evaluation of the extracranial vasculature in the workup of TIA. Carotid Doppler US is noninvasive and is accurate in evaluating the degree of carotid stenosis [38]. Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with TIA or minor stroke who are candidates for CEA or stenting within 48 hours of onset [12]. US Duplex Doppler Transcranial Transcranial Doppler can be used for the detection of microembolic events and in the detection of intracranial vascular pathology in the secondary workup of TIA. However, this is not typically used as an initial imaging test in the setting of TIA. Arteriography Cervicocerebral Cerebral angiography has the highest spatial and temporal resolution of any vascular imaging study. Due to the invasive nature of catheter-directed angiography, other modalities are typically preferred in the initial workup for stroke. However, in the setting of highly suspected LVO with no need for perfusion imaging or MRI to determine eligibility for EVT, initial catheter angiography after noncontrast CT may be the preferable vascular imaging study due to the ability to rapidly convert a diagnostic catheter angiogram to EVT [53,54].