The objective of this proposal is to develop an integrated microCT/microPET scanner for mouse imaging. Small animal imaging technologies are starting to play an important role in biomedical research, offering the opportunity to make repeated measurements of biological processes in intact laboratory animals in a completely non-invasive fashion. Combining molecular imaging (PET) with high resolution anatomic imaging (CT) offers advantages both in data interpretation and in data quantification compared with using either modality independently. Applications for this unique multi-modality device would include studies of tumor kinetics and metastasis in mouse models of human cancer, imaging of gene delivery and expression, and tracking of labeled cells in vivo. We propose to build an integrated system that incorporates amorphous selenium (a-Se) x-ray detector technology, a compact x-ray source and high resolution scintillation detectors in a co-planar geometry allowing CT and PET data to be acquired simultaneously. Preliminary studies have indicated the feasibility of this approach. In this proposal, detailed studies of x-ray spectra and the influence of filtration will determine appropriate x-ray tube settings/filters that produce the highest contrast to noise ratio for the lowest radiation dose. The a-Se detector will be characterized and compared with widely used phosphor/CCD based detector technology. The radiation dose to the mouse from the CT scan will be measured, and its biological effect, if any, investigated. The CT and PET detector components will be mounted into a gantry suitable for preliminary imaging studies in phantoms and in mice. The use of the CT data for correcting photon attenuation and for partial volume effects in the PET data will be investigated. Finally, the reproducibility of imaging anatomy and metabolism will be assessed both in repeat studies of the same subject, and in individual studies across subjects.

National Institute of Health (NIH)
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Research Project (R01)
Project #
Application #
Study Section
Diagnostic Imaging Study Section (DMG)
Program Officer
Haller, John W
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
University of California Davis
Biomedical Engineering
Schools of Engineering
United States
Zip Code
Liang, H; Yang, Y; Yang, K et al. (2007) A microPET/CT system for in vivo small animal imaging. Phys Med Biol 52:3881-94
Johnson, Matthew D; Kao, Olivia E; Kipke, Daryl R (2007) Spatiotemporal pH dynamics following insertion of neural microelectrode arrays. J Neurosci Methods 160:276-87
Subbaroyan, Jeyakumar; Kipke, Daryl R (2006) The role of flexible polymer interconnects in chronic tissue response induced by intracortical microelectrodes--a modeling and an in vivo study. Conf Proc IEEE Eng Med Biol Soc 1:3588-91
Marzullo, Timothy C; Miller, Charles R; Kipke, Daryl R (2006) Suitability of the cingulate cortex for neural control. IEEE Trans Neural Syst Rehabil Eng 14:401-9
Subbaroyan, Jeyakumar; Martin, David C; Kipke, Daryl R (2005) A finite-element model of the mechanical effects of implantable microelectrodes in the cerebral cortex. J Neural Eng 2:103-13
Judenhofer, Martin S; Pichler, Bernd J; Cherry, Simon R (2005) Evaluation of high performance data acquisition boards for simultaneous sampling of fast signals from PET detectors. Phys Med Biol 50:29-44
Boone, John M; Velazquez, Orlando; Cherry, Simon R (2004) Small-animal X-ray dose from micro-CT. Mol Imaging 3:149-58
Vetter, Rio J; Williams, Justin C; Hetke, Jamille F et al. (2004) Chronic neural recording using silicon-substrate microelectrode arrays implanted in cerebral cortex. IEEE Trans Biomed Eng 51:896-904
Goertzen, Andrew L; Nagarkar, Vivek; Street, Robert A et al. (2004) A comparison of x-ray detectors for mouse CT imaging. Phys Med Biol 49:5251-65