Abstract: Objective To prospectively design and followed by evaluation on the effect of the combination of recorded lectures with online question and answer(Q & A) in graduate course of medical imaging, so as to provide more experience for future online medical imaging courses. Methods A total of 19 students recruited in the 2020 spring semester course were included. An online questionnaire was used to collect the results of self-assessment on knowledge and skill learning before and after each lecture, participation rate of Q & A activity. Results The knowledge and skills mastery level after learning every 16 lectures was significantly higher than that before the lecture. The average score of students in the Objective test was 44.2±7.0 and the average score of students' participation in the Q & A session was 3.79±0.92. There is no significant correlation between test scores and the participation in Q & A. The average score of students' evaluation of the necessity about the Q & A activity is 4.47±0.90. The average score of students' subjective feelings of traditional classrooms is higher than that of remote virtual classrooms, but the difference is not statistically. Conclusions Recorded lectures plus online Q & A in graduate course of medical imaging has significantly improved students' learning outcomes on knowledge and skill. Online Q & A following the course can increase students' participation and enhance their learning motivation.

Key words: recorded courses, question and answer, medical imaging