Mark B. Williams
Primary AppointmentProfessor, Radiology
- BS, Physics, Grinnell College
- MS, Physics, Wake Forest University
- PhD, Physics, University of Virginia
Design, Development and Optimization of Medical Imaging Technologies
1) Dual modality breast imaging: We are developing an integrated imaging system that combines the sensitivity of digital mammography with the specificity of scintimammography in a single compact, upright unit. The imaging system functions by obtaining mirror-image x-ray transmission and gamma emission images concurrently with the breast in a single configuration. Co-registration then correlates the gamma and x-ray images to within a fraction of a pixel.
2) Molecular imaging system for small animal research: We are developing a tomographic imaging system that permits simultaneous acquisition of high resolution functional (SPECT) and structural (x-ray CT) images from mice and rats. The resulting fused image correlates the radiotracer distribution with the morphological information provided by the x-ray data. A similar 2-dimensional system is being routinely utilized as a component of the Small Animal Multimodality Imaging Center for mouse and rat studies in gene expression imaging, radiation oncology and diagnostic radiology.
3) Evaluation of basic imaging properties of early commercial systems for digital breast imaging. Characteristics being quantified include sensitivity, linearity, spatial resolution, noise properties, and detective quantum efficiency. We are working with a consortium of detector physicists located across North America to develop uniform evaluation methods and to produce a combined data set.