An experimental study on the noise correlation properties of CBCT projection data

Hua Zhang, Luo Ouyang, Jianhua Ma, Jing Huang, Wufan Chen, Jing Wang

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

Abstract

In this study, we systematically investigated the noise correlation properties among detector bins of CBCT projection data by analyzing repeated projection measurements. The measurements were performed on a TrueBeam on-board CBCT imaging system with a 4030CB flat panel detector. An anthropomorphic male pelvis phantom was used to acquire 500 repeated projection data at six different dose levels from 0.1 mAs to 1.6 mAs per projection at three fixed angles. To minimize the influence of the lag effect, lag correction was performed on the consecutively acquired projection data. The noise correlation coefficient between detector bin pairs was calculated from the corrected projection data. The noise correlation among CBCT projection data was then incorporated into the covariance matrix of the penalized weighted least-squares (PWLS) criterion for noise reduction of low-dose CBCT. The analyses of the repeated measurements show that noise correlation coefficients are non-zero between the nearest neighboring bins of CBCT projection data. The average noise correlation coefficients for the first- and second- order neighbors are 0.20 and 0.06, respectively. The noise correlation coefficients are independent of the dose level. Reconstruction of the pelvis phantom shows that the PWLS criterion with consideration of noise correlation results in a lower noise level as compared to the PWLS criterion without considering the noise correlation at the matched resolution.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
PublisherSPIE
Volume9033
ISBN (Print)9780819498267
DOIs
StatePublished - 2014
EventMedical Imaging 2014: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 17 2014Feb 20 2014

Other

OtherMedical Imaging 2014: Physics of Medical Imaging
CountryUnited States
CitySan Diego, CA
Period2/17/142/20/14

Fingerprint

Bins
Noise
projection
Detectors
correlation coefficients
Covariance matrix
Noise abatement
Imaging systems
pelvis
Least-Squares Analysis
dosage
detectors
Pelvis
time lag
noise reduction
low noise

Keywords

  • low-dose CBCT
  • noise correlation
  • PWLS

ASJC Scopus subject areas

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

Cite this

Zhang, H., Ouyang, L., Ma, J., Huang, J., Chen, W., & Wang, J. (2014). An experimental study on the noise correlation properties of CBCT projection data. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 9033). [90332R] SPIE. https://doi.org/10.1117/12.2043151

An experimental study on the noise correlation properties of CBCT projection data. / Zhang, Hua; Ouyang, Luo; Ma, Jianhua; Huang, Jing; Chen, Wufan; Wang, Jing.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9033 SPIE, 2014. 90332R.

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

Zhang, H, Ouyang, L, Ma, J, Huang, J, Chen, W & Wang, J 2014, An experimental study on the noise correlation properties of CBCT projection data. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 9033, 90332R, SPIE, Medical Imaging 2014: Physics of Medical Imaging, San Diego, CA, United States, 2/17/14. https://doi.org/10.1117/12.2043151
Zhang H, Ouyang L, Ma J, Huang J, Chen W, Wang J. An experimental study on the noise correlation properties of CBCT projection data. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9033. SPIE. 2014. 90332R https://doi.org/10.1117/12.2043151
Zhang, Hua ; Ouyang, Luo ; Ma, Jianhua ; Huang, Jing ; Chen, Wufan ; Wang, Jing. / An experimental study on the noise correlation properties of CBCT projection data. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9033 SPIE, 2014.
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