Stefan Popescu

Publications of Stefan Popescu

• Ultra-high resolution flat-panel volume CT: fundamental principles, design architecture, and system characterization.

  Authors: Rajiv Gupta, Michael Grasruck, Christoph Suess, Soenke H Bartling, Bernhard Schmidt, Karl Stierstorfer, Stefan Popescu, Tom Brady, Thomas Flohr

  European radiology. 07/2006; 16(6):1191-205.

  Digital flat-panel-based volume CT (VCT) represents a unique design capable of ultra-high spatial resolution, direct volumetric imaging, and dynamic CT scanning. This innovation, when fullyDigital flat-panel-based volume CT (VCT) represents a unique design capable of ultra-high spatial resolution, direct volumetric imaging, and dynamic CT scanning. This innovation, when fully developed, has the promise of opening a unique window on human anatomy and physiology. For example, the volumetric coverage offered by this technology enables us to observe the perfusion of an entire organ, such as the brain, liver, or kidney, tomographically (e.g., after a transplant or ischemic event). By virtue of its higher resolution, one can directly visualize the trabecular structure of bone. This paper describes the basic design architecture of VCT. Three key technical challenges, viz., scatter correction, dynamic range extension, and temporal resolution improvement, must be addressed for successful implementation of a VCT scanner. How these issues are solved in a VCT prototype and the modifications necessary to enable ultra-high resolution volumetric scanning are described. The fundamental principles of scatter correction and dose reduction are illustrated with the help of an actual prototype. The image quality metrics of this prototype are characterized and compared with a multi-detector CT (MDCT).

• Evaluation of Image Quality and Dose on a Flat-Panel CT-Scanner.

  Authors: Michael Grasruck, Christoph Suess, K. Stierstorfer, Stefan Popescu, T. Flohr

  01/2005

• Anatomy of an Ultra-High Resolution Flat-Panel CT: A Pictorial Introduction to Fundamental Principles and Technology

  Authors: R. Gupta, Jennifer Lisauskas, S. H. Bartling, Michael Grasruck, K. Stierstorfer, Bernhard Schmidt, Stefan Popescu, Christoph Suess, T. Flohr, T. Brady

  01/2004