... carotid artery disease ) and narrowed arteries in your brain. Your abdomen (belly). The test can be used to check blood flow in your organs and to look for aneurysms. A new organ after transplantation surgery . The test can show whether blood is flowing through the organ normally. A Doppler ultrasound can also help diagnose blood vessel tumors and problems with the ... a transient ischemic attack (a stroke that lasts a few minutes). An ultrasound of your brain, called a transcranial Doppler ultrasound, can diagnose the ...