Vertebrobasilar transcranial color-coded duplex ultrasonography: improvement with echo enhancement

Area of Science:

• Neurology
• Medical Imaging
• Vascular Ultrasound

Background:

• Transcranial color-coded duplex ultrasonography (US) for vertebrobasilar assessment faces challenges due to poor acoustic penetration and anatomical variations.
• Diagnostic yield is often limited, impacting the detection of cerebrovascular diseases.

Purpose of the Study:

• To evaluate the impact of echo enhancement on the diagnostic performance of vertebrobasilar transcranial color-coded duplex US.
• To determine if contrast agents can overcome limitations in visualizing the vertebrobasilar system.

Main Methods:

• 23 patients with vertebrobasilar stroke underwent transcranial color-coded duplex US before and after echo-enhancer injection.
• Key vertebrobasilar vessels (PCA, vertebral artery, basilar artery) were assessed for image quality and signal visibility.
• Image quality and maximum signal depth were graded; comparison with digital subtraction angiography or MR angiography was performed for abnormal/inconclusive cases.

Main Results:

• Echo enhancement significantly improved image quality across all assessed vertebrobasilar vessels (P1 PCA, V4 vertebral artery, basilar artery, basilar head).
• Insufficient image quality rates decreased substantially after echo enhancement (e.g., basilar artery from 83% to 35%).
• Diagnostic accuracy for stenosis or occlusion increased from 60% to 93% with echo enhancement.

Conclusions:

• Echo enhancement markedly improves image quality of the vertebrobasilar system via transcranial ultrasonography.
• This technique significantly enhances diagnostic confidence and accuracy in evaluating vertebrobasilar vascular conditions.