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| Study on the Influencing Factors and Long-term Stability of the CT Number of Siemens Large Aperture CT Simulator |
| HU Jin-you1,2,ZOU Lian1,XIE Zhao1,LUO Ke-lin1,YIN Yun-peng1,ZHANG Wei-sha1 |
1. Cancer Center, Sichuan Academy of Medical Sciences Sichuan Provincial People‘s Hospital, Chengdu,Sichuan 610072, China
2. Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, Sichuan 610064, China |
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Abstract The influence of scanning parameters on the CT number of CIRS-062M phantom was studied by changing the current time product, voltage and reconstruction convolution kernel of Siemens CT simulator.The annual quality assurance data of CIRS-062M phantom and the monthly quality assurance data of CTP504 phantom were retrospectively analyzed to study the long-term stability of CT number.The results show that the current time product has almost no effect on the CT number, and the maximum change is 4.6HU.The voltage has great influence on the CT number, with the maximum change of 585.3HU. Except for the Head H31s and Child Head H21s convolution kernels, the other convolution kernels have slight influence on the CT number.The CT number of the two phantoms have maintained good consistency in recent years, the maximum change is dense bone in CIRS-062M phantom, with a maximum change of 63.3HU and an average change of (-8.68±17.82)HU.
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Received: 13 May 2021
Published: 18 May 2023
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2023, Vol. 44 
