As an important tool in the research of nuclear physics,electron cyclotron stands in an essential position in tumor radiotherapy.The theory of medical microtron is introduced.The theory of medical runway microtron is expressed and its characteristics are compared with electron linear accelerator.

KDD has an abroad application foreground in hospital,espectially in HIS,clinical asistance,detection,and diagnosis.Some research achievements has been applied in hospital diagnosing and treatment.Such aspects of KDD are discussed as manual neural network,fuzzy system evolutionary algorithms,rough set,decision tree,support vector machine,etc.[Chinese Medical Equipment Journal,2008,29(2):74-75]