Digital X-ray systems based on amorphous selenium.
نویسندگان
چکیده
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Measured and calculated K-fluorescence effects on the MTF of an amorphous-selenium based CCD x-ray detector.
PURPOSE Theoretical reasoning suggests that direct conversion digital x-ray detectors based upon photoconductive amorphous-selenium (a-Se) could attain very high values of the MTF (modulation transfer function) at spatial frequencies well beyond 20 cycles mm(-1). One of the fundamental factors affecting resolution loss, particularly at x-ray energies just above the K-edge of selenium (12.66 keV...
متن کاملImage quality and radiation dose on digital chest imaging: comparison of amorphous silicon and amorphous selenium flat-panel systems.
OBJECTIVE The aim of this study was to compare the image quality and radiation dose in chest imaging using an amorphous silicon flat-panel detector system and an amorphous selenium flat-panel detector system. In addition, the low-contrast performance of both systems with standard and low radiation doses was compared. MATERIALS AND METHODS In two groups of 100 patients each, digital chest radi...
متن کاملAnomalous high-pressure behavior of amorphous selenium from synchrotron x-ray diffraction and microtomography.
The high-pressure behavior of amorphous selenium has been investigated with time-resolved diamond anvil cell synchrotron x-ray diffraction and computed microtomography techniques. A two-step dynamic crystallization process is observed in which the monoclinic phase crystallized from the amorphous selenium and gradually converted to the trigonal phase, thereby explaining previously observed anoma...
متن کاملX-ray imaging using amorphous selenium: determination of Swank factor by pulse height spectroscopy.
The use of photoconductors, especially amorphous selenium (a-Se), in x-ray imaging is currently of interest. A critical performance parameter of an imaging detector is the Swank factor for degradation of the signal to noise ratio, or DQE(0), due to variations in the detector response. The Swank factor is evaluated from measured pulse height spectra generated by the absorption of monoenergetic x...
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ژورنال
عنوان ژورنال: American Journal of Roentgenology
سال: 1996
ISSN: 0361-803X,1546-3141
DOI: 10.2214/ajr.167.2.8686617