 It is thought that transcranial doppler ultrasonography aimed at residual obstructive intracranial blood flow may help expose thrombi to tissue plasminogen activator or other thrombolytic drugs.Studies have shown that complete recanalisation or dramatic clinical recovery can be increased by more than 19% when using transcranial doppler ultrasonography.UEST is also sometimes used in the thrombolytic treatment of myocardial infarctions.