Frequency-combined extended 3D reconstruction for multiple circular cone-beam CT scans

Rainer Grimmer, Jongduk Baek, Norbert Pelc, Marc Kachelrieß

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

2 Citations (Scopus)

Abstract

In circular cone-beam CT a single circle scan often does not cover the complete z-range of interest. If this is the case, two or more circle scans are acquired. The standard combination of the separate reconstructions has two disadvantages: 1) The reconstructable volume is smaller than possible, thus dose remains unused and the noise level is higher than necessary. 2) The cone-beam artifacts are increased at the edges of the partial volumes which have a large distance to the midplanes. To overcome these disadvantages we developed a method that simultaneously reconstructs all circle scans and thereby is able to reconstruct larger segments from each circle scan on the one hand and that reduces cone-beam artifacts by combining the segments in frequency domain on the other hand. The proposed method was evaluated using a simulation study as well as measured data from different flat-panel cone-beam CT scanners, as for example the Varian OBI scanner. In the example geometry we used the maximal reconstructable z-range can be increased by 25% and our approach additionally leads to a noise reduction of about 40% in the overlap region. Regarding the cone-beam artifacts, we were able to reduce the artifact level to a value as low as achievable by more complex algorithms that perform a voxel-wise weighted backprojection to favor voxels seen under small cone-angles. This paper demonstrates that the proposed algorithm is able to significantly improve the reconstruction of sequence scans while the reconstruction time is kept equivalent to the standard approach. We further demonstrate that the method can be used in clinical practice.

Original languageEnglish
Title of host publication2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
Pages4089-4092
Number of pages4
DOIs
Publication statusPublished - 2012 Mar 26
Event2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 - Valencia, Spain
Duration: 2011 Oct 232011 Oct 29

Other

Other2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
CountrySpain
CityValencia
Period11/10/2311/10/29

Fingerprint

circular cones
Cone-Beam Computed Tomography
Artifacts
cones
artifacts
Noise
scanners
noise reduction
dosage
geometry
simulation

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

Cite this

Grimmer, R., Baek, J., Pelc, N., & Kachelrieß, M. (2012). Frequency-combined extended 3D reconstruction for multiple circular cone-beam CT scans. In 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 (pp. 4089-4092). [6153778] https://doi.org/10.1109/NSSMIC.2011.6153778
Grimmer, Rainer ; Baek, Jongduk ; Pelc, Norbert ; Kachelrieß, Marc. / Frequency-combined extended 3D reconstruction for multiple circular cone-beam CT scans. 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011. 2012. pp. 4089-4092
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abstract = "In circular cone-beam CT a single circle scan often does not cover the complete z-range of interest. If this is the case, two or more circle scans are acquired. The standard combination of the separate reconstructions has two disadvantages: 1) The reconstructable volume is smaller than possible, thus dose remains unused and the noise level is higher than necessary. 2) The cone-beam artifacts are increased at the edges of the partial volumes which have a large distance to the midplanes. To overcome these disadvantages we developed a method that simultaneously reconstructs all circle scans and thereby is able to reconstruct larger segments from each circle scan on the one hand and that reduces cone-beam artifacts by combining the segments in frequency domain on the other hand. The proposed method was evaluated using a simulation study as well as measured data from different flat-panel cone-beam CT scanners, as for example the Varian OBI scanner. In the example geometry we used the maximal reconstructable z-range can be increased by 25{\%} and our approach additionally leads to a noise reduction of about 40{\%} in the overlap region. Regarding the cone-beam artifacts, we were able to reduce the artifact level to a value as low as achievable by more complex algorithms that perform a voxel-wise weighted backprojection to favor voxels seen under small cone-angles. This paper demonstrates that the proposed algorithm is able to significantly improve the reconstruction of sequence scans while the reconstruction time is kept equivalent to the standard approach. We further demonstrate that the method can be used in clinical practice.",
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Grimmer, R, Baek, J, Pelc, N & Kachelrieß, M 2012, Frequency-combined extended 3D reconstruction for multiple circular cone-beam CT scans. in 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011., 6153778, pp. 4089-4092, 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011, Valencia, Spain, 11/10/23. https://doi.org/10.1109/NSSMIC.2011.6153778

Frequency-combined extended 3D reconstruction for multiple circular cone-beam CT scans. / Grimmer, Rainer; Baek, Jongduk; Pelc, Norbert; Kachelrieß, Marc.

2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011. 2012. p. 4089-4092 6153778.

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

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Grimmer R, Baek J, Pelc N, Kachelrieß M. Frequency-combined extended 3D reconstruction for multiple circular cone-beam CT scans. In 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011. 2012. p. 4089-4092. 6153778 https://doi.org/10.1109/NSSMIC.2011.6153778