Christopher Cagnon, PhD

Associate Professor of Radiology & Biomedical Physics, Chief of Radiology Physics, UCLA

Research Interests
Dr. Cagnon's research interests involve the physics of computed tomography (CT) image acquisition, including estimating radiation dose and assessing image quality. In addition, he is a faculty member of the NIH-sponsored UCLA Biomedical Physics Graduate Program.

Current Research Projects

Monte Carlo Based Patient Radiation Doses from CT
The purpose of this work is to develop and test a method to estimate the relative and absolute absorbed radiation dose from axial and spiral CT scans using a Monte Carlo approach.

National Lung Screening Trial (NLST)
The NLST is a joint collaboration between the American College of Radiology Imaging Network (ACRIN) and the Lung Screening Study and has enrolled over 50,000 older smokers that have been screened annually with either chest radiographs or low dose helical CT. Medical outcomes will be collected on these participants through 2009 to determine differences in lung cancer specific mortality between the two screening technologies. Dr. Cagnon is a member of the ACRIN-NLST physics Committee, whose responsibility it is to ensure standardization of imaging protocols, certification of imaging equipment, and ongoing periodic evaluation of equipment calibration and image quality.

Dr. Cagnon's Lectures

Orders vs. Protocols: When the Technologists Question the Physician

Practical Aspects of Radiation Protection in Computed Tomography

Recent Publications

  1. Kruger R, Flynn MJ, Judy PF, Cagnon CH, Seibert JA. Effective dose assessment for participants in the national lung screening trial undergoing posteroanterior chest radiographic examinations. AJR Am J Roentgenol. 2013 Jul;201(1):142-6
  2. Mathieu KB, Turner AC, Khatonabadi M, McNitt-Gray MF,Cagnon CH, Cody DD. Varying kVp as a means of reducing CT breast dose to pediatric patients. Phys Med Biol. 2013 Jul 7;58(13):4455-69
  3. Khatonabadi M, Kim HJ, Lu P, McMillan KL, Cagnon CH, DeMarco JJ, McNitt-Gray MF. The feasibility of a regional CTDIvol to estimate organ dose from tube current modulated CT exams. Med Phys. 2013 May;40(5):051903.
  4. Khatonabadi M, Zhang D, Mathieu K, Kim HJ, Lu P, Cody D, Demarco JJ, Cagnon CH, McNitt-Gray MF. A comparison of methods to estimate organ doses in CT when utilizing approximations to the tube current modulation function. Med Phys. 2012 Aug;39(8):5212-28
  5. Zhang D, Cagnon CH, Villablanca JP, McCollough CH, Cody DD, Stevens DM, Zankl M, Demarco JJ, Turner AC, Khatonabadi M, McNitt-Gray MF. Peak skin and eye lens radiation dose from brain perfusion CT based on Monte Carlo simulation. AJR Am J Roentgenol. 2012 Feb;198(2):412-7
  6. Larke FJ, Kruger RL, Cagnon CH, Flynn MJ, McNitt-Gray MM, Wu X, Judy PF, Cody DD. Estimated radiation dose associated with low-dose chest CT of average-size participants in the National Lung Screening Trial. AJR Am J Roentgenol. 2011 Nov;197(5):1165-9.