title: [CT scan optimization in SPECT/CT equipment of nuclear medicine].
abstract: OBJECTIVE
  In order to reduce patients' radiation doses and decrease the exposure time of the CT Tube. By summarizing experiential methods from the previous practice work, we hope to draw an optimized scheme of CT scanner.
  
  
  METHODS
  We analyzed the continuous clinical examples in four months, changed the different levels of parameters slowly, optimized acquisition conditions and retrospected the CT radiative dose. In the meantime, we counted the monthly CT Bulb exposure time, exposure time per capita tube data and so on.
  
  
  RESULTS
  Compared with former result, the average CT radiative dose per person is decreased 84.72%, which conventional bone, the small joints of the bone, the brain and the heart radiation reduced respectively 83.82%, 88.80%, 86.78% and 84.49%, and the differences are statistically significant. The exposure time of optimized CT Tube is 2 031 s.
  
  
  CONCLUSIONS
  Using the CT scan optimization scheming has great efforts in the practice of clinical nuclear medicine, can reduce the exposure time of the CT Tube and improve the lifetime of the bulb. Therefore, it can be widely used.
authors.affiliation: Nuclear Medicine, Huashan Hospital Affiliated to Fudan University, Shanghai 200040. wyk377013@gmail.com
authors.forename: Yuankai
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhuang
authors.initials: Z
authors.lastname: Liu
mesh_terms: D006801:Humans; D009683:Nuclear Medicine / Q000295:instrumentation*; D011829:Radiation Dosage; D015899:Tomography, Emission-Computed, Single-Photon / Q000295:instrumentation; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*