Cem Altunbas, PhD
Associate Professor, Radiation Oncology

Department: Radiation Oncology


  • Bayat F, Eldib ME, Altunbas C. Megavoltage cross-scatter rejection and correction using 2D antiscatter grids in kilovoltage CBCT imaging. Proc SPIE Int Soc Opt Eng. 2022;12031:120311K. doi: 10.1117/12.2611202. Epub 2022 Apr 4. PMID: 35465130; PMCID: PMC9028100.
  • Bayat F, Eldib ME, Kavanagh B, Miften M, Altunbas C. Concurrent kilovoltage CBCT imaging and megavoltage beam delivery: suppression of cross-scatter with 2D antiscatter grids and grid-based scatter sampling. Phys Med Biol. 2022 Aug 9;67(16):10.1088/1361-6560/ac8268. doi: 10.1088/1361-6560/ac8268. PMID: 35853441; PMCID: PMC9378529.
  • F Bayat, M Eldib, M Miften, C Altunbas, “A Raw Data Correction and Iterative Reconstruction Pipeline for Quantitative CBCT-Guided Radiation Therapy,” Med. Phys. 49(6), E223 (2022)
  • M Eldib, F Bayat, M Miften, C Altunbas, “A Simulation Platform to Evaluate the Effect of 2D Antiscatter Grid Primary Transmission on CBCT Image Quality,” Med. Phys. 49(6), E601 (2022)
  • M Eldib, F Bayat, M Miften, C Altunbas, “A Novel Model for Characterizing the Effects of Gantry Flex On 2D Antiscatter Grid Performance in CBCT Systems,” Med. Phys. 49(6), E174 (2022)
  • D. Ruan, F. Bayat, C. Altunbas, “Perturbation-Based Quality Surrogate for Scatter Estimation and Parameter Optimization in Anti-Scatter Grid (ASG)-CBCT,” Med. Phys. 49(6), E174 (2022)
  • F. Bayat, M. Eldib, C. Altunbas, “"Megavoltage cross-scatter rejection and correction using 2D antiscatter grids in kilovoltage CBCT imaging." SPIE Physics of Medical Imaging Conference, San Diego, 2022.
  • C. Altunbas, "Improving Tissue Visualization and Quantitative Accuracy in CBCT Imaging for Radiation Therapy", AAPM Florida Chapter Meeting, September 2022.
  • Park Y, Alexeev T, Miller B, Miften M, Altunbas C. Evaluation of scatter rejection and correction performance of 2D antiscatter grids in cone beam computed tomography. Med Phys. 2021 Apr;48(4):1846-1858. PubMed PMID: 33554377
  • Yu, Z., Park, Y. and Altunbas, C., 2020, March. Simultaneous scatter rejection and correction method using 2D antiscatter grids for CBCT. In Medical Imaging 2020: Physics of Medical Imaging (Vol. 11312, p. 113122W). International Society for Optics and Photonics.
  • Altunbas C, Park Y, Yu Z, Gopal A. A Unified Scatter Rejection and Correction Method for Cone Beam Computed Tomography. Med Phys. 2020 Dec 30. [Epub ahead of print] PubMed PMID: 33378551
  • Altunbas C, Alexeev T, Miften M, Kavanagh B. Effect of grid geometry on the transmission properties of 2D grids for flat detectors in CBCT. Phys Med Biol. 2019 Nov 15;64(22):225006. PubMed PMID: 31585444
  • Alexeev T, Kavanagh B, Miften M, Altunbas C. A novel total variation based ring artifact suppression method for CBCT imaging with two-dimensional antiscatter grids. Med Phys. 2019 May;46(5):2181-2193. PubMed PMID: 30802970
  • Forghani F, Mahl A, Patton TJ, Jones BL, Borden MA, Westerly DC, Altunbas C, Miften M, Thomas DH. Simulation of X-ray induced acoustic imaging for absolute dosimetry: accuracy of image reconstruction methods. Med Phys. 2019 Dec 11. [Epub ahead of print] PubMed PMID: 31828781
  • Alexeev T, Kavanagh B, Miften M, Altunbas C. Development and Evaluation of a Total Variation Minimization Based Method for Suppressing Ring Artifacts in CBCT Images. InMEDICAL PHYSICS 2018 Jun 1 (Vol. 45, No. 6, pp. E536-E536). 111 RIVER ST, HOBOKEN 07030-5774, NJ USA: WILEY.
  • Altunbas C, Kavanagh B, Alexeev T, Miften M. Transmission characteristics of a two dimensional antiscatter grid prototype for CBCT. Med Phys. 2017 Aug;44(8):3952-3964. PubMed PMID: 28513847
  • Alexeev T, Kavanagh B, Miften M, Altunbas C. Two-dimensional antiscatter grid: A novel scatter rejection device for Cone-beam computed tomography. Med Phys. 2017 Dec 12. [Epub ahead of print] PubMed PMID: 29235120
  • Gan GN, Altunbas C, Morton JJ, Eagles J, Backus J, Dzingle W, Raben D, Jimeno A. Radiation dose uncertainty and correction for a mouse orthotopic and xenograft irradiation model. Int J Radiat Biol. 2015 Dec 21;:1-7. [Epub ahead of print] PubMed PMID: 26689828
  • Altunbas C, Lai CJ, Zhong Y, Shaw CC. Reduction of ring artifacts in CBCT: detection and correction of pixel gain variations in flat panel detectors. Med Phys. 2014 Sep;41(9):091913. PubMed PMID: 25186400
  • Gan GN, Eagles J, Keysar SB, Wang G, Glogowska MJ, Altunbas C, Anderson RT, Le PN, Morton JJ, Frederick B, Raben D, Wang XJ, Jimeno A. Hedgehog signaling drives radioresistance and stroma-driven tumor repopulation in head and neck squamous cancers. Cancer Res. 2014 Dec 1;74(23):7024-36. PubMed PMID: 25297633
  • C. Glide-Hurst, M. Bellon, R. Foster, C. Altunbas, M. Speiser, M. Altman, D. Westerly, N. Wen, B. Zhao, M. Miften, I. J. Chetty, and T. Solberg, "Commissioning of the Varian TrueBeam linear accelerator: A multi-institutional study,"Med. Phys. 40, 031719 (2013)
  • C, Altunbas, Image Corrections, Chapter 10 in "CONE BEAM COMPUTED TOMOGRAPHY" to be published by Taylor and Francis in 2013.
  • C. Altunbas, B. Kavanagh, W. Dzingle, K. Stuhr, L. Gaspar, M. Miften, "Dosimetric errors during treatment of centrally located lung tumors with stereotactic body radiation therapy: Monte Carlo evaluation of tissue inhomogeneity corrections", Med Dosim. 2013 Winter;38(4):436-41
  • C. Altunbas, C. Howells, M. Proper, K. Reddy, G. Gan, P DeWitt, B. Kavanagh, T. Schefter, M. Miften, "Evaluation of threshold and gradient based 18F-fluoro-deoxy-2-glucose hybrid positron emission tomographic image segmentation methods for liver tumor delineation," Practical Radiation Oncology
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Practice Locations

Specialty Information

  • American Board of Radiology, Therapeutic Medical Physics, Board Certification (2010)

General Information

Department: Radiation Oncology
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CU Anschutz
Fitzsimons Building

13001 East 17th Place
Campus Box C290
Aurora, CO 80045

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