Interior Reconstruction from Truncated Projection Data in Cone-beam Computed Tomography.

The interior reconstruction of completely truncated projection data is a frontier research hotspot in cone-beam computed tomography (CBCT) application. It is difficult to find a method with acceptable accuracy and high efficiency to solve it. Based on the simplified algebraic reconstruction technique (S-ART) algorithm and the filtered back projection (FBP) algorithm with the new filter, an efficient and feasible interior reconstruction algorithm is proposed in this paper. The algorithm uses the S-ART algorithm to quickly recover the complete projection data and then uses the new ramp filter which can suppress the high-frequency noise in the projection data to filter the recovered complete projection data. Finally, the interior reconstructed images are obtained by back projection. The computational complexity of the proposed algorithm is close to that of the FBP algorithm for the reconstruction of the whole object, and the reconstructed image quality is acceptable, which provides an effective method for interior reconstruction in CBCT. Simulation results show the effectiveness of the method.

Application research of "education cloud platform + dual track" teaching method in continuing medical education of thoracic surgery / 中华医学教育探索杂志

Objective:To explore the application prospect of "education cloud platform + dual track" teaching in continuing medical education of thoracic surgery.Methods:A total of 100 trainees who participated in continuing medical education in thoracic surgery department in Air Force Medical University were randomly divided into experimental group and control group, with 50 students in each group. The experimental group adopted "education cloud platform + dual-track" teaching, and the control group adopted dual-track teaching. At the end of the study, an examination of theoretical knowledge and practical operation would be conducted; at the same time, an anonymous questionnaire survey would be used to evaluate the satisfaction of the two teaching modes. SPSS 20.0 was used for t test and chi-square test. Results:There was no statistically significant difference between the two groups in basic theoretical performance. The professional theoretical performance [(28.6±3.7) points] and operational theory performance [(34.9±4.7) points] of the experimental group were higher than those of the control group, with significant differences ( P<0.05). The experimental group performed better than the control group in five practical operation assessments: basic operation of thoracoscopy, basic operation of opening and closing the chest, operation of vascular isolation and suture, operation of esophageal anastomosis and operation of tracheal anastomosis, with statistical differences ( P<0.05). The satisfaction with teaching of experimental group was significantly higher than that of the control group ( P<0.05). Conclusion:"Education cloud platform + dual track" teaching can effectively ensure the teaching progress of problem-based learning (PBL) and team-based learning (TBL), improve students' learning effect, and has high promotion and application value.