The common slip with a Doppler scan is to treat the name of the test as an answer. A scan looks at something. By itself it does not tell you what is wrong, and readers in Tinley Park, Illinois are better off keeping those two ideas apart.
What the test looks at
medlineplus.gov describes it in one sentence: "This test uses ultrasound to look at the blood flow in the large arteries and veins in the arms or legs." That is a description of what is examined. For wider background on the condition behind many leg circulation questions, the NHLBI, NIH page on living with peripheral artery disease is one reference.
What a description cannot do
Knowing what a test looks at is different from knowing what your own result means. A plain description of a scan does not interpret anything for you. Treat it as the start of a question for a clinician.
Reading you can do alone
The NHLBI, NIH page that explains what peripheral artery disease is suits a reader who wants vocabulary before a visit. Reading helps you ask better questions. It is not a way to read a scan yourself.
Where your own interpretation should stop
If you are holding a result and trying to decode it alone, stop there and ask the clinician who ordered the test. For general reading, there is the CDC overview of peripheral arterial disease, and your own result is a separate question.
The conservative choice
Ask what the scan was meant to answer for you and what the next step is.