pulssiDopplerin

The pulssiDopplerin, or pulsed Doppler, is a technique used in Doppler ultrasonography. It is a type of ultrasound that measures the velocity of blood flow. Unlike continuous wave Doppler, which can only detect the presence of flow and its maximum velocity, pulsed Doppler can determine the velocity of blood flow at specific locations within the body. This is achieved by sending out short bursts of ultrasound waves, or pulses, and then listening for the reflected echoes. By measuring the time it takes for the echoes to return and analyzing the Doppler shift, the velocity of the blood cells moving within that specific sample volume can be calculated.

This ability to sample at specific locations makes pulsed Doppler invaluable for detailed anatomical assessment and the diagnosis of various vascular conditions. For instance, it can be used to identify narrowings or blockages in arteries, assess the direction and speed of blood flow in veins, and evaluate the function of heart valves. The sample volume, which is the area from which the Doppler signal is derived, can be adjusted in size and position by the sonographer, allowing for precise examination of targeted blood vessels. However, pulsed Doppler has a limitation known as aliasing, which occurs when the blood flow velocity exceeds the system's ability to accurately measure it, leading to an incorrect representation of the velocity.