The additional information that transcranial Doppler can provide as part of a multimodal imaging protocol in many clinical settings has not been evaluated. Transcranial Doppler is a bedside procedure used to assess cerebral blood flow velocity via cerebral circulation and pulsatility index (PI). Many diseases can lead to cerebral vessels vasospasm as in subarachnoid hemorrhage and trauma. Cerebral vessels vasospasm represented by abnormal elevation of cerebral blood flow velocity. Intracranial pressure can be monitored by pulsatility index which reflects blood flow resistance in cerebral vessels. Transcranial Doppler ultrasonography is also the unique modality for detection of micro emboli in high-risk patients. Also, it can be used for evaluation of circulatory arrest with subsequent confirmation of brain death Transcranial Doppler ultrasonography is the only diagnostic modality that provides a reliable assessment of cerebral blood flow patterns in real time. The physiological information obtained from TCD is complementary to the anatomical details obtained from other neuroimaging modalities. TCD is relatively cheap, can be performed bedside, and allows monitoring in acute emergency settings.

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经颅多普勒超声检查（用途、局限性和潜力）：一篇评论文章

经颅多普勒在许多临床环境中作为多模式成像协议的一部分可以提供的附加信息尚未得到评估。经颅多普勒是一种床边程序，用于通过脑循环和搏动指数 (PI) 评估脑血流速度。许多疾病可导致脑血管痉挛，如蛛网膜下腔出血和外伤。以脑血流速度异常升高为代表的脑血管痉挛。可以通过反映脑血管血流阻力的搏动指数监测颅内压。经颅多普勒超声检查也是检测高危患者微栓子的独特方式。还，它可用于评估循环停止并随后确认脑死亡 经颅多普勒超声检查是唯一可以实时可靠评估脑血流模式的诊断方式。从 TCD 获得的生理信息是对从其他神经影像学模式获得的解剖细节的补充。TCD 相对便宜，可以在床边进行，并允许在紧急情况下进行监测。