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11 November 1994 Performance of x-ray imaging systems with optical coupling for demagnification between scintillator and CCD readout
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This paper discusses the performance of x-ray imaging devices employing optical coupling between the x-ray detector (phosphor screen) and the readout (CCD). Optical coupling can be performed with the aid of a lens or with the aid of a fiber-optic taper. Conventional wisdom predicts that fiber-optic coupling is superior on account of superior light collection efficiency. For the same demagnification, fiber-optic tapers usually have a higher numerical aperture in the object plane than a lens. This paper presents a review of critical imaging system components and provides a comparison of factors such as light collection efficiency, phosphor screen light output and CCD sensitivity. The paper presents data obtained with two commercially available x-ray imaging systems, one a lens coupled system, the other a fiber- optically coupled system. These systems are used for mammographically guided stereotactic breast biopsy to determine the x-, y-, and z-coordinates of the lesion to be biopsied. The paper concludes that a lens coupled x-ray imaging system can be superior to a fiber-optic one, particularly with respect to Detective Quantum Efficiency. This superiority is based on a quantum gain of about 5 CCD electrons per absorbed x-ray photon, which is (however barely) sufficient to preserve most of the information collected by the system's Lanex screen.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Roehrig, Tong Yu, and William V. Schempp "Performance of x-ray imaging systems with optical coupling for demagnification between scintillator and CCD readout", Proc. SPIE 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics, (11 November 1994);

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