This retrospective study was approved by the ethical review board of our hospital (IRB number: JD-HG-2021-32). Informed consent was obtained from all patients. Fifty-seven patients with acute arterial embolism in our hospital were enrolled in the study between January 2015 and December 2017, including 45 male and 12 female adults aged from 40 to 88 years, with an average age of 73.52 years. In total, 95 ROIs were detected in these patients, including old emboli (50) and new thromboses (45).
The inclusion criteria were:

a) Clinical manifestations of acute onset, manifested by varying degrees of sudden limb pain, followed by numbness, paleness, cyanosis, dyskinesia, cold limbs, arterial pulse weakening, or disappearance of symptoms;

b) Gross specimen showing that the thrombosis head was sclerotic and the tail thrombosis was soft; pathological diagnosis showing that the head thromboses was white and the tail thromboses was red;

c) Embolus taken immediately after CTA examination of the lower extremities at DSA.

The exclusion criteria included:

a) Artifacts in images;

b) Unclear popliteal artery lumen;

c) Images could not be matched;

d) Nephrotic syndrome.

Figure 2 shows the details of patient selection.
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