Figure 2.

Transcranial Colour-Coded Duplex Sonography (TCCS) from the temporal bone window in axial scanning plane with Power-mode. The sampled right middle cerebral artery shows a continuous presence of multiple high-intensity transient signals (HITS), like a "curtain effect", 30 seconds after the release of the straining phase of the Valsalva manouver.

Carbonelli et al. BMC Pulmonary Medicine 2012 12:42   doi:10.1186/1471-2466-12-42
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