Low-cost, high-resolution x-ray detector system for digital radiography and computed tomography

Details Low-cost, high-resolution x-ray detector system for digital radiography and computed tomography Low-cost, high-resolution x-ray detector system for digital radiography and computed tomography

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.2009...31s&link_type=abstract

Proc. SPIE Vol. 2009, p. 31-35, X-Ray Detector Physics and Applications II, Victor J. Orphan; Ed.

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We have designed and evaluated a novel design of line array x-ray detector for use with digital radiography (DR) and computed tomography (CT) systems. The Radiographic Line Scan (RLS) detector is less than half the cost of discrete multi-channel line array detectors, yet provides the potential for resolution to less than 25 micrometers at energies of 420 kV. The RLS detector consists of a scintillator fiber-optically coupled to a thermo-electrically cooled line array CCD. Gadolinium oxysulfide screen material has been used as the scintillator, in thicknesses up to 250 micrometers . Scintillating glass, which is formed into a fiber optic bundle, has also been used in thicknesses up to 2 mm. The large 2.5 mm by 25 micrometers CCD cells provide high dynamic range while preserving high resolution; the 2.5 mm dimension is oriented in the x-ray absorption direction while the 25 micrometers dimension is oriented in the resolution direction. Servo controlled thermo-electric cooling of the CCD to a fixed temperature provides reduction of dark current and stabilization of the output. Greater dynamic range is achieved by reducing the dark current, while output stabilization reduces the need for frequent calibration of the detector. Measured performance characteristics are presented along with DR and CT images produced using the RLS detector.

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