Doppler ultrasound can show loss of spectral window due to:

Doppler ultrasound is an important tool for assessing blood flow characteristics, and one of the specific features it can help identify is the spectral window. The spectral window presents as a clean and clearly defined region on the Doppler spectral display, allowing for proper measurement of blood flow velocities. When there is loss of this spectral window, it indicates a disruption in the laminar flow of blood.

Turbulent flow disturbance is a primary cause of the loss of spectral window seen on Doppler ultrasound. This form of flow is characterized by chaotic and irregular movement of blood, which leads to multiple signals being emitted from a range of velocities at once. As a result, instead of maintaining a clear, defined spectral window, the signal becomes broad and may lack clarity. The chaotic nature of turbulent flow scatters the Doppler signal, causing the loss of the spectral window and making it difficult to accurately assess the blood flow velocities.

In contrast, normal blood flow patterns are associated with a clear spectral window. Vessel wall reflections would not contribute to the loss unless they significantly altered the flow pattern, while maintaining sample volume in streamline flow typically preserves the spectral window rather than causing its loss. Hence, turbulent flow disturbance stands as the most fitting explanation for the loss of the spectral window