Journal of Radiation Research and Radiation Processing ›› 2019, Vol. 37 ›› Issue (4): 4-040303-8.doi: 10.11889/j.1000-3436.2019.rrj.37.040303

• RADIOBIOLOGY AND RADIOMEDICINE • Previous Articles     Next Articles

Method of core-beam CT imaging scatter correction based on Monte Carlo simulations

MENG Huipeng1,2(),WANG Keqiang1,FU Juan2,FENG Yuanming1()   

  1. 1. School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
    2. Characteristic Medical Center of PAP, Tianjin 300162, China
  • Received:2019-02-28 Revised:2019-04-28 Accepted:2019-04-28 Online:2019-08-20 Published:2019-08-21
  • Contact: Yuanming FENG E-mail:hongyi1218@163.com;ymfeng@tju.edu.cn
  • About author:MENG Huipeng(male) was born in October 1981, and obtained his master’s degree from Nankai University in 2011. Now he is a doctoral candidate at Tianjin University, majoring in radiotherapy physics for tumor and network-related research, physicist, senior engineer. E-mail: hongyi1218@163.com
  • Supported by:
    the Seed Fund Project of Affiliated Hospital of Logistics University of PAP(FYM201620)

Abstract:

Based on the EGSnrc program to modularize the core-beam CT (CBCT) system, this study simulated the imaging process entirely based on the accurate construction of the geometric and beam characteristics of the CBCT system. The scatter correction of CBCT images was realized through Monte Carlo simulations by separating the scatter fraction (mainly Compton and Rayleigh scatterings) that affects CBCT image quality based on the interaction between particles and matter. In the phantom images and real cases, the three-dimensionally reconstructed CBCT image significantly reduced the error of the scatter artifacts of the image after scatter correction. In addition, the CT value in the selected region of interest was compared with the planning CT image. The average value of the CT error value in both scan modes was reduced to less than 10 HU, MRSE values were reduced by 71.4%, and CNR values were increased by 19.8%. The scatter correction method significantly improves anatomical details and can be used for CBCT images.

Key words: Core-beam CT (CBCT), Monte Carlo simulations, Scatter correction

CLC Number: 

  • TL72,R815