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A new phantom developed to test the ATCM performance of chest CT scanners.
Yang, Yang; Zhuo, Weihai; Chen, Bo; Lu, Shunqi; Zhou, Pei; Ren, Wenliang; Liu, Haikuan.
Affiliation
  • Yang Y; Institute of Radiation Medicine, Fudan University, Shanghai 200032,People's Republic of China.
  • Zhuo W; Institute of Radiation Medicine, Fudan University, Shanghai 200032,People's Republic of China.
  • Chen B; Institute of Radiation Medicine, Fudan University, Shanghai 200032,People's Republic of China.
  • Lu S; Institute of Radiation Medicine, Fudan University, Shanghai 200032,People's Republic of China.
  • Zhou P; Shanghai United Imaging Healthcare, Shanghai 201807, People's Republic of China.
  • Ren W; Shanghai United Imaging Healthcare, Shanghai 201807, People's Republic of China.
  • Liu H; Institute of Radiation Medicine, Fudan University, Shanghai 200032,People's Republic of China.
J Radiol Prot ; 41(2)2021 06 01.
Article in En | MEDLINE | ID: mdl-33862608
ABSTRACT
In this study, a new ATCM phantom was developed to test the performance of the automatic tube current modulation (ATCM) of computed tomography (CT) scanners.. Based on the Chinese reference man and Monte Carlo simulations of x-ray attenuation, a more realistic ATCM phantom made of polymethyl methacrylate was developed. The phantom has a length of 20 cm, and it can be used to measure the dose profile along the central axis using 19 real-time MOSFET detectors. The image noise can be calculated slice by slice in the phantom's center. Test experiments showed that the phantom could initiate tube current modulation under different modulation levels of CT scans, and the actual effects of ATCM could be evaluated with the aid of the dose profile measurements. Using the measured dose profiles and image noise, the preferred dose can easily be identified from a choice of different modulation levels. The new phantom developed in this study can be used to test the ATCM performance of CT scanners, and is useful for further studies of the optimization of CT scan protocols with ATCM.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Radiation Protection Limits: Humans / Male Language: En Journal: J Radiol Prot Year: 2021 Document type: Article

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Radiation Protection Limits: Humans / Male Language: En Journal: J Radiol Prot Year: 2021 Document type: Article