Richard D. Lamoreaux

Development Of A High Resolution X-Ray Imaging Device For Use In Coronary Angiography

This paper describes a high resolution x-ray imaging device which is being developed through NIH sponsorship by the University of Arizona. It consists of an external modular x-ray sensor, a proximity focussed image intensifier and six CCDs coupled to the output of the image intensifier via six fiber optic tapers. The tapers are joined at the large ends to form a coplanar fiber optic taper assembly. The spatial resolution is expected to be determined by the external sensor up to the Nyquist frequency of the CCD which is (after magnification by the tapers) 3.9 1p/mm. The intended application is coronary angiography.

A Fiber-Optic Network System for PACS

This paper describes installing the first two portions of a fiber-optic based image-transmission network. The network topology is a star. The system is controlled by logical circuit switching of broadcast signals. High-speed operation is attained by two means: First, the signalling speed of the network is 144 Megabits/second. Second, wavelength multiplexing is used to separate the control signals and image-transmission signals. This paper describes the installation and integration of two arms of the network star. The arms include: the star coupler (SC), two network interface units (NIU), two interface translation units (NIU), and two units of imaging equipment (IE). Development of the system components was done separately at the Department of Radiology, University of Arizona (UofA) in the U.S.A. and at the Toshiba Medical Imaging Laboratories in Japan. The SC and NIUs were constructed by Toshiba while the ITUs and IEs were constructed by the UofA. The system integration was done at the University of Arizona by a team with members from both locations.

Prototype Performance Of A High Resolution X-Ray Imaging System For Use In Coronary Angiography

This paper describes preliminary performance data of the components of a high resolution x-ray imaging device, under development at the University of Arizona through NIH sponsorship for application in coronary angiography. The system will consist of an external modular x-ray sensor, a proximity focussed image intensifier and six CCDs coupled to the output of the image intensifier via six fiber optic tapers. The tapers are joined at the large ends to form a coplanar fiber optic taper assembly.One taper has been delivered whith distortion of less than 1.2 %.One channel of the camera and display electronics is operational. The limiting resolution of a pilotsystem, consisting of a 40 mm Gen.II image intensifier, the fiber optic taper and a CCD is 3.9 1p/mm, the Nyquist frequency of the CCD magnified by the taper.