Used to screen for vertebral and carotid artery dissection and/or injury after blunt head and neck trauma (BCVI - blunt cerebrovascular injury)
A CTA to evaluate for VAI should be obtained in those meeting the modified<unk><unk> 
BCVI has the highest association with cervical hyperextension and rotation, hyperflexion, or direct blunt force to head and neck
Most injuries are diagnosed after the development of symptoms secondary to central nervous system ischemia resulting in neurologic morbidity of up to 80% and associated mortality of up to 40%.
Denver screening criteria
ACEP clinical policies
Six item screen
ADDIE system
FALLS protocol
ACS - Risk Stratification
Wells criteria
SAD PERSONS score