Do i need to get a mri to figure out the cause of my pulsatile tinnitus?

MRI often used: Causes of pulsatile tinnitus include arteriovenous fistula (avf), carotid stenosis, glomus tumor, arteriovenous malformation (avm), aberrant carotid artery or cardiac murmur. A venous hum contributing to pulsatile tinnitus can also be caused by venous anomalies. All of these can potentially be detected by MRI (carotid stenosis would traditionally be picked-up by carotid ultrasound).