在DSA中，在造影剂注射到患者血管后得到的图像称作
A. 掩膜图像
B. 混合图像
C. 最终输出图像
What type of energy is X-ray?
A. High frequency sound waves
B. High-energy electromagnetic radiation
C. Emissions from radioactive sources
D. Electron flow, discharged from the hot cathode
How do electromagnetic waves propagate?
A. By applying an electric field
By applying a magnetic field
C. Through front and back vibration
D. Through self-oscillation
4. The energy electrons lose when colliding with electrons in the anode are released as heat, and
A. a) Electricity.
B. b) More electrons.
C. c) X-rays.
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