G E Christensen

Summary

Affiliation: University of Iowa
Country: USA

Publications

  1. ncbi request reprint Volumetric transformation of brain anatomy
    G E Christensen
    Department of Electrical and Computer Engineering, The University of Iowa, Iowa City 52242, USA
    IEEE Trans Med Imaging 16:864-77. 1997
  2. ncbi request reprint Tracking lung tissue motion and expansion/compression with inverse consistent image registration and spirometry
    Gary E Christensen
    Department of Electrical and Computer Engineering and Department of Radiation Oncology, The University of Iowa, Iowa City, Iowa 52242, USA
    Med Phys 34:2155-63. 2007
  3. ncbi request reprint Synthesizing average 3D anatomical shapes
    Gary E Christensen
    Department of Electrical and Computer Engineering, The University of Iowa, 4324 SC, Iowa City, IA 52242, USA
    Neuroimage 32:146-58. 2006
  4. ncbi request reprint Consistent image registration
    G E Christensen
    Department of Electrical and Computer Engineering, University of Iowa, Iowa City 52242, USA
    IEEE Trans Med Imaging 20:568-82. 2001
  5. pmc 4DCT-based measurement of changes in pulmonary function following a course of radiation therapy
    Kai Ding
    Department of Biomedical Engineering, The University of Iowa, Iowa City, Iowa 52242, USA
    Med Phys 37:1261-72. 2010
  6. ncbi request reprint Establishing a normative atlas of the human lung: intersubject warping and registration of volumetric CT images
    Baojun Li
    Department of Biomedical Engineering, University of Iowa, 1402 SC, Iowa City, IA 52242, USA
    Acad Radiol 10:255-65. 2003
  7. ncbi request reprint Rapid prototype patient-specific drill template for cervical pedicle screw placement
    Brent D Owen
    Roy J and Lucille A Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
    Comput Aided Surg 12:303-8. 2007
  8. doi request reprint Engineering patient-specific drill templates and bioabsorbable posterior cervical plates: a feasibility study
    Timothy C Ryken
    Department of Nuerosurgery, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, USA
    J Neurosurg Spine 10:129-32. 2009
  9. doi request reprint Image-based drill templates for cervical pedicle screw placement
    Timothy C Ryken
    Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
    J Neurosurg Spine 10:21-6. 2009
  10. ncbi request reprint Registration-derived estimates of local lung expansion as surrogates for regional ventilation
    Joseph M Reinhardt
    Department of Biomedical Engineering, The University of Iowa, Iowa City, IA 52242, USA
    Inf Process Med Imaging 20:763-74. 2007

Research Grants

  1. Information Processing in Medical Imaging 2005
    Gary Christensen; Fiscal Year: 2005
  2. NIREP: Non-rigid Image Registration Evaluation Project
    Gary Christensen; Fiscal Year: 2007

Detail Information

Publications21

  1. ncbi request reprint Volumetric transformation of brain anatomy
    G E Christensen
    Department of Electrical and Computer Engineering, The University of Iowa, Iowa City 52242, USA
    IEEE Trans Med Imaging 16:864-77. 1997
    ....
  2. ncbi request reprint Tracking lung tissue motion and expansion/compression with inverse consistent image registration and spirometry
    Gary E Christensen
    Department of Electrical and Computer Engineering and Department of Radiation Oncology, The University of Iowa, Iowa City, Iowa 52242, USA
    Med Phys 34:2155-63. 2007
    ..These benefits include reducing radiation dose to normal tissue, maximizing dose to the tumor, improving patient care, reducing treatment cost, and increasing patient throughput...
  3. ncbi request reprint Synthesizing average 3D anatomical shapes
    Gary E Christensen
    Department of Electrical and Computer Engineering, The University of Iowa, 4324 SC, Iowa City, IA 52242, USA
    Neuroimage 32:146-58. 2006
    ..It is also shown that using inverse consistent transformations produces average shape estimates with less error compared to those produced with transformations with nontrivial inverse consistent errors...
  4. ncbi request reprint Consistent image registration
    G E Christensen
    Department of Electrical and Computer Engineering, University of Iowa, Iowa City 52242, USA
    IEEE Trans Med Imaging 20:568-82. 2001
    ..The results show that the joint estimation of a consistent set of forward and reverse transformations constrained by linear-elasticity give better registration results than using either constraint alone or none at all...
  5. pmc 4DCT-based measurement of changes in pulmonary function following a course of radiation therapy
    Kai Ding
    Department of Biomedical Engineering, The University of Iowa, Iowa City, Iowa 52242, USA
    Med Phys 37:1261-72. 2010
    ..In this article, the authors propose a method that quantitatively measures the regional changes in lung tissue function following a course of radiation therapy by using 4DCT and image registration techniques...
  6. ncbi request reprint Establishing a normative atlas of the human lung: intersubject warping and registration of volumetric CT images
    Baojun Li
    Department of Biomedical Engineering, University of Iowa, 1402 SC, Iowa City, IA 52242, USA
    Acad Radiol 10:255-65. 2003
    ..To establish the range of normal values for quantitative CT-based measures of lung structure and function, the authors developed a method for matching pulmonary structures across individuals and creating a normative human lung atlas...
  7. ncbi request reprint Rapid prototype patient-specific drill template for cervical pedicle screw placement
    Brent D Owen
    Roy J and Lucille A Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
    Comput Aided Surg 12:303-8. 2007
    ..To assess the feasibility and accuracy of a drill template for the placement of a cervical pedicle screw in a single vertebral level...
  8. doi request reprint Engineering patient-specific drill templates and bioabsorbable posterior cervical plates: a feasibility study
    Timothy C Ryken
    Department of Nuerosurgery, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, USA
    J Neurosurg Spine 10:129-32. 2009
    ..In this study, the authors explore the use of computer-generated templates and introduce their methods for creating custom, bioabsorbable posterior cervical implants...
  9. doi request reprint Image-based drill templates for cervical pedicle screw placement
    Timothy C Ryken
    Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
    J Neurosurg Spine 10:21-6. 2009
    ..The goal of the study was to assess the accuracy of a drill template in the placement of cervical PSs at a single vertebral level...
  10. ncbi request reprint Registration-derived estimates of local lung expansion as surrogates for regional ventilation
    Joseph M Reinhardt
    Department of Biomedical Engineering, The University of Iowa, Iowa City, IA 52242, USA
    Inf Process Med Imaging 20:763-74. 2007
    ..We compare lung expansion estimated across five pressure changes to a xenon CT based measure of specific ventilation, and have shown good agreement (linear regression, r2 = 0.89 during gas wash-in) in one animal...
  11. ncbi request reprint Transitive inverse-consistent manifold registration
    Xiujuan Geng
    Department of Electrical and Computer Engineering, The University of Iowa, Iowa City, IA 52242, USA
    Inf Process Med Imaging 19:468-79. 2005
    ..Furthermore, the TICMR is shown to avoid some local minimum that are not avoided when registering with a curvature constraint alone...
  12. pmc Registration-based estimates of local lung tissue expansion compared to xenon CT measures of specific ventilation
    Joseph M Reinhardt
    Department of Biomedical Engineering, University of Iowa, Iowa City, IA 52242, USA
    Med Image Anal 12:752-63. 2008
    ..Using 3D image registration to match images acquired at 10 cm H(2)O and 15 cm H(2)O airway pressures gave the best match between the average Jacobian and the xenon CT specific ventilation (linear regression, average r(2)=0.73)...
  13. pmc Evaluation of lobar biomechanics during respiration using image registration
    Kai Ding
    Department of Biomedical Engineering, The University of Iowa, Iowa City, IA 52242, USA
    Med Image Comput Comput Assist Interv 12:739-46. 2009
    ..The results show a superior-inferior gradient in the magnitude of lobar sliding. We compare whole-lung-based registration accuracy to lobe-by-lobe registration accuracy using vessel bifurcation landmarks...
  14. ncbi request reprint The comprehensive imaging-based analysis of the lung: a forum for team science
    Eric A Hoffman
    Department of Radiology, University of Iowa, 200 Hawkins Dr, Iowa City, IA 52242, USA
    Acad Radiol 11:1370-80. 2004
  15. ncbi request reprint Large deformation inverse consistent elastic image registration
    Jianchun He
    Department of Electrical and Computer Engineering, The University of Iowa, Iowa City, IA 52242, USA
    Inf Process Med Imaging 18:438-49. 2003
    ..For these experiments, the inverse consistency error was reduced on average by 50 times in 2D and 30 times in 3D compared to the viscous fluid registration algorithm...
  16. ncbi request reprint Subcortical, cerebellar, and magnetic resonance based consistent brain image registration
    Vincent A Magnotta
    Iowa Mental Health Clinical Research Center, Department of Psychiatry, University of Iowa, Iowa City, IA 52242, USA
    Neuroimage 19:233-45. 2003
    ..Furthermore, statistically significant improvements for all structures were achieved using the LI-SI algorithm compared to the intensity-only algorithm...
  17. ncbi request reprint Consistent landmark and intensity-based image registration
    H J Johnson
    Electrical and Computer Engineering Department, The University of Iowa, Iowa City 52242, USA
    IEEE Trans Med Imaging 21:450-61. 2002
    ....
  18. ncbi request reprint Automatic measurement of the labyrinth using image registration and a deformable inner ear atlas
    Gary E Christensen
    Department of Electrical and Computer Engineering, The University of Iowa, 4016 SC, Iowa City, IA 52242, USA
    Acad Radiol 10:988-99. 2003
    ..This article presents a new method for measuring the shape of the cochlea, vestibule, semi-circular canals, and internal auditory canal using image registration and a deformable inner ear atlas...
  19. ncbi request reprint Image-based dose planning of intracavitary brachytherapy: registration of serial-imaging studies using deformable anatomic templates
    G E Christensen
    Department of Electrical Engineering, University of Iowa, Iowa City, IA, USA
    Int J Radiat Oncol Biol Phys 51:227-43. 2001
    ..These promising modeling results indicate that realistic registration of the cumulative dose distribution to the organs (or targets) of interest for radiation therapy of cervical cancers is achievable...
  20. ncbi request reprint Quantitation of the reconstruction quality of a four-dimensional computed tomography process for lung cancer patients
    Wei Lu
    Department of Radiation Oncology, Washington University School of Medicine, St Louis, Missouri 63110, USA
    Med Phys 32:890-901. 2005
    ..The 4D reconstruction provides the CT data required to measure the three-dimensional trajectory of tumor and lung tissue during free breathing...
  21. pmc Computed tomography studies of lung mechanics
    Brett A Simon
    Department of Anesthesiology, Tower 711, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21287 8711, USA
    Proc Am Thorac Soc 2:517-21, 506-7. 2005
    ....

Research Grants3

  1. Information Processing in Medical Imaging 2005
    Gary Christensen; Fiscal Year: 2005
    ..Women and Minorities are actively encouraged to attend and participate to the fullest extent in the IPMI through the Call for Papers, advertisements, and targeted personal contacts. ..
  2. NIREP: Non-rigid Image Registration Evaluation Project
    Gary Christensen; Fiscal Year: 2007
    ..3) Disseminate NIREP software and annotated reference databases to the research community. (4) Test performance of major non-rigid image registration algorithms contained in ITK and SPM using the NIREP software. ..