This study aimed to compare the diagnostic values between HR-MRI and CTA in young adults with cervical artery dissections. Totally 42 patients with ischemic stroke were recruited, including 20 carotid artery dissections, 12 vertebral artery dissections and 10 non-dissected cervical arteries. Two radiologists separately analyzed all the images. According to the radiologists’ scores for the likelihood of the dissections, positive predictive value, negative predictive value, sensitivity and specificity for both modalities were calculated. We found the higher sensitivity and specificity of HR-MRI. This study supports the value of HR-MRI in non-invasive diagnosis of young adults due to cervical artery dissections.