Population

The study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). The study was approved by the institutional ethics committee board of The Second Affiliated Hospital of Soochow University and informed consent was provided by all participants.

A total of 31 patients from December 2021 to February 2022 who were clinically suspected of having cerebral vascular disease were enrolled in the study. The exclusion criteria were as follows: iodine contrast agent allergy, surgical history of stent implantation and aneurysm clipping or embolization, motion artifacts, or severe heart, liver, and renal insufficiency. All 31 patients (23 males and 8 females) had undergone head and neck CTA and CTP and were distributed into Group A (n=31; CTA-DF-CTP) and Group B (n=31; conventional CTA). The average age was 67.07±13.42 years, ranging from 31 to 91 years.