Cerebrovascular assessment using a Doppler carotid scanner and real-time frequency analysis

Area of Science:

• Vascular Surgery
• Diagnostic Imaging
• Neurology

Background:

• Noninvasive diagnosis of carotid artery disease is crucial for stroke prevention.
• Traditional Doppler ultrasound methods have limitations in accurately assessing carotid lesions.

Purpose of the Study:

• To evaluate the effectiveness of a color-coded continuous-wave Doppler scanner combined with a real-time frequency analyzer for diagnosing carotid artery disease.
• To assess the diagnostic value of frequency analysis in detecting carotid stenoses.

Main Methods:

• Two studies were conducted: one using a color-coded continuous-wave Doppler scanner and the other employing frequency analysis of Doppler waveforms.
• The first study evaluated sensitivity and specificity against arteriography in 56 sides for lesions >50% stenosis.
• The second study semiquantitatively evaluated frequency analysis recordings by measuring peak frequency and Doppler frequency spectrum width.

Main Results:

• The Doppler scanner showed 71% sensitivity and 82% specificity for >50% stenosis.
• Real-time frequency analysis improved signal detection, diagnostic value of waveforms, differentiation of carotid arteries, and artifact recognition.
• Preliminary results indicate frequency analysis has potential for detecting minor carotid stenoses.

Conclusions:

• Combining color-coded Doppler with real-time frequency analysis enhances the noninvasive diagnosis of carotid artery disease.
• This integrated approach offers improved accuracy and diagnostic capabilities compared to audio signal analysis alone.
• Frequency analysis shows promise for detecting even minor carotid stenoses, aiding in comprehensive vascular assessment.