A Doppler ultrasound or Duplex scan is a non-invasive imaging technique that uses sound waves to assess blood flow through blood vessels. It is commonly used to examine arteries and veins in various parts of the body, including the legs, arms, neck, and abdomen. Here’s an overview of the procedure:

 

   – There is typically minimal preparation required for a Doppler/Duplex scan. You may be asked to wear a gown to allow easy access to the area being examined.

   – In some cases, you might need to fast before the exam, especially if the abdominal vessels are being assessed.

 

   – You will be positioned on an examination table, and the technologist will apply a special gel to the skin over the area to be examined. This gel helps to transmit sound waves between the ultrasound probe and the skin.

 

   – The technologist uses a handheld device called a transducer, which emits high-frequency sound waves. The transducer is moved over the skin in the area being examined.

 

   – In Doppler ultrasound, the transducer emits sound waves at a frequency that can reflect off moving blood cells. By analyzing the changes in frequency (Doppler shift) of the reflected sound waves, the ultrasound machine can create a visual representation of blood flow.

 

   – The term “Duplex” refers to the combination of traditional ultrasound imaging (B-mode) and Doppler imaging. This allows simultaneous visualization of the structure of the blood vessels and the direction and speed of blood flow.

 

   – The technologist examines the blood vessels in real-time on a monitor. Doppler ultrasound can help identify blockages, clots, narrowing (stenosis), or other abnormalities in the blood vessels.

 

   – The examination may involve recording certain segments of the Doppler waveform for further analysis. The technologist or a physician may review these recordings to assess the characteristics of blood flow.

 

   – Once the examination is complete, the gel is wiped off, and you can typically resume your normal activities immediately.

 

   – The recorded images and Doppler waveforms are then interpreted by a radiologist or a vascular specialist. The results are often provided to the referring healthcare provider.

 

Doppler/Duplex scans are valuable diagnostic tools for evaluating blood vessels, detecting abnormalities, and helping guide treatment decisions. The procedure is safe, painless, and does not involve exposure to ionizing radiation.