Scatter correction for cone-beam computed tomography using moving blocker strips

Jing Wang, Weihua Mao, Timothy Solberg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

One well-recognized challenge of cone-beam computed tomography (CBCT) is the presence of scatter contamination within the projection images. Scatter degrades the CBCT image quality by decreasing the contrast, introducing shading artifacts and leading to inaccuracies in the reconstructed CT number. We propose a blocker-based approach to simultaneously estimate scatter signal and reconstruct the complete volume within the field of view (FOV) from a single CBCT scan. A physical strip attenuator (i.e., "blocker"), consists of lead strips, is inserted between the x-ray source and the patient. The blocker moves back and forth along z-axis during the gantry rotation. The two-dimensional (2D) scatter fluence is estimated by interpolating the signal from the blocked regions. A modified Feldkamp-Davis-Kress (FDK) algorithm and an iterative reconstruction based on the constraint optimization are used to reconstruct CBCT images from un-blocked projection data after the scatter signal is subtracted. An experimental study is performed to evaluate the performance of the proposed scatter correction scheme. The scatter-induced shading/cupping artifacts are substantially reduced in CBCT using the proposed strategy. In the experimental study using a CatPhan®600 phantom, CT number errors in the selected regions of interest are reduced from 256 to less than 20. The proposed method allows us to simultaneously estimate the scatter signal in projection data, reduce the imaging dose and obtain complete volumetric information within the FOV.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume7961
DOIs
StatePublished - 2011
EventMedical Imaging 2011: Physics of Medical Imaging - Lake Buena Vista, FL, United States
Duration: Feb 13 2011Feb 17 2011

Other

OtherMedical Imaging 2011: Physics of Medical Imaging
CountryUnited States
CityLake Buena Vista, FL
Period2/13/112/17/11

Fingerprint

Cone-Beam Computed Tomography
Tomography
Cones
strip
cones
tomography
projection
Artifacts
field of view
artifacts
gantry cranes
attenuators
x ray sources
estimates
Image quality
fluence
contamination
Contamination
Lead
X-Rays

Keywords

  • computed tomography
  • cone-beam CT
  • imaging artifacts
  • moving blocker
  • scatter correction

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Wang, J., Mao, W., & Solberg, T. (2011). Scatter correction for cone-beam computed tomography using moving blocker strips. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 7961). [796125] https://doi.org/10.1117/12.877718

Scatter correction for cone-beam computed tomography using moving blocker strips. / Wang, Jing; Mao, Weihua; Solberg, Timothy.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 7961 2011. 796125.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wang, J, Mao, W & Solberg, T 2011, Scatter correction for cone-beam computed tomography using moving blocker strips. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 7961, 796125, Medical Imaging 2011: Physics of Medical Imaging, Lake Buena Vista, FL, United States, 2/13/11. https://doi.org/10.1117/12.877718
Wang J, Mao W, Solberg T. Scatter correction for cone-beam computed tomography using moving blocker strips. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 7961. 2011. 796125 https://doi.org/10.1117/12.877718
Wang, Jing ; Mao, Weihua ; Solberg, Timothy. / Scatter correction for cone-beam computed tomography using moving blocker strips. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 7961 2011.
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