Bowtie filters for dedicated breast CT: theory and computational implementation

Medical Physics
Kimberly Kontson, Robert J Jennings

Abstract

To design bowtie filters with improved properties for dedicated breast CT to improve image quality and reduce dose to the patient. The authors present three different bowtie filters designed for a cylindrical 14-cm diameter phantom with a uniform composition of 40/60 breast tissue, which vary in their design objectives and performance improvements. Bowtie design #1 is based on single material spectral matching and produces nearly uniform spectral shape for radiation incident upon the detector. Bowtie design #2 uses the idea of basis material decomposition to produce the same spectral shape and intensity at the detector, using two different materials. Bowtie design #3 eliminates the beam hardening effect in the reconstructed image by adjusting the bowtie filter thickness so that the effective attenuation coefficient for every ray is the same. All three designs are obtained using analytical computational methods and linear attenuation coefficients. Thus, the designs do not take into account the effects of scatter. The authors considered this to be a reasonable approach to the filter design problem since the use of Monte Carlo methods would have been computationally intensive. The filter profiles for a cone-angle of 0° were used f...Continue Reading

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Citations

Sep 4, 2015·Medical Physics·Kimberly Kontson, Robert J Jennings
Aug 5, 2017·Journal of X-ray Science and Technology·Mengfei LiPeng Zhang
Aug 20, 2020·Physical and Engineering Sciences in Medicine·Meng CaiYang Wang
Nov 10, 2016·Optics Express·Mengfei LiPeng Zhang
Jan 11, 2017·Physics in Medicine and Biology·R KramerH J Khoury
Jul 14, 2020·Computers in Biology and Medicine·Said Mohd Shaffiq Said RahmatNg Kwan Hoong

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