What is the name of the Doppler xray used for chest xrays?

The Doppler X-ray technique commonly used for chest X-rays is referred to as "Doppler ultrasound" rather than a specific X-ray. However, if you are referring to imaging that involves Doppler principles in the chest context, it typically relates to ultrasound rather than X-ray technology. Traditional chest X-rays do not utilize Doppler methods, which are more associated with blood flow imaging in ultrasound.