Objective: This study was designed to evaluate the clinical sensitivity and specificity of CT pulmonary artery three-dimensional imaging in the diagnosis of pulmonary embolism.
Methods: A total of 118 patients with pulmonary embolism who were treated in Shaoyang People's Hospital from June 2022 to May 2024 were selected. All patients received CT pulmonary artery imaging. The examination results, emboli type and number were recorded and counted in detail.
Result: The diagnostic accuracy of CT pulmonary artery imaging was as high as 96.61% (114/118), the sensitivity was 96.49% (110/114), the specificity was 100.00% (4/4), the missed diagnosis rate was 3.51% (2/114), no misdiagnosis occurred, and the positive predictive value was 100% (110/110). The negative predictive value was 50.00% (4/8). After pulmonary angiography, we found four immediate signs: complete obstruction, mural filling defect, central filling defect, and hemilateral filling defect.
Conclusion: CT pulmonary artery imaging shows high sensitivity, specificity and accuracy in the diagnosis of pulmonary embolism, and the rate of misdiagnosis and missed diagnosis is relatively low.

This paper refers to the ideal of open education and to the three forms of Massive Open Online Courses (MOOCs), and it presents a comparative study for Open Universities, answering the question whether if it actually is about the “open” education systems and by combining experience and theoretical research, a precise critical presentation of MOOCs is given.