Objectives. The transcranial Doppler ultrasound development for use in the diagnosis of the middle cerebral artery vasospasm in patients with subarachnoid hemorrhage is described.
Review. Limitations of a conventional ultrasound, the precursor of the transcranial color Doppler ultrasound used for estimation of blood flow velocity are discussed. Transcranial Doppler ultrasound (TUD) accuracy is evaluated by analysis of the receiver-operating characteristic (ROC). The velocity threshold for recognition of the middle cerebral artery vasospasm is also established. Standardization taking into account patients' age and gender, as well as the Lindegaard score (VMCA/VICA) make the method more precise, especially in the diagnosis of small intensity vasospasms.
Conclusion. The results show that newer methods of transcranial Doppler ultrasound, using colour blood flow estimation are becoming an essential tool in the hands of the neuroradiologist.