Mr. Hugh F. Garvey Profile

Hugh F. Garvey

Director of Imaging at Torrent Photonics

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Proceedings Article | 12 September 2009 Paper

DQE of imaging detectors for application in crystallography

Hans Roehrig, William Schempp, Michael Damento, Alonzo Pickett, Wayne Maher, Hugh Garvey

Proceedings Volume 7450, 745008 (2009) https://doi.org/10.1117/12.830041

KEYWORDS: X-rays, Sensors, Crystallography, Crystals, Copper, Spectroscopy, X-ray imaging, Modulation transfer functions, Spatial frequencies, Image sensors

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We have evaluated for the first time the Detective Quantum Efficiency of 2 imaging detectors which are used for Crystallography. Crystallography is the science of determining the arrangement of atoms within a crystal from the manner in which a beam of usually low energy (8-17.5 keV) monochromatic X-rays is scattered from the electrons within the crystal. There is a growing consensus in the scientific world that the Detective Quantum Efficiency (DQE) is the most suitable parameter for describing the imaging performance of an x-ray imaging device. The DQE describes the ability of the imaging system to preserve the Signal to Noise Ratio (SNR) on the way from the radiation field emerging from the very fine and practically monochrome x-ray beam through the various imaging system components up to the 3-dimensional crystal image. Normally the DQE of x-ray systems is based on the effective energy of the x-ray beam and the x-ray dose as measured with a dosimeter. Typical dosimeters are not very accurate at low x-ray energies which are used in Crystallography. We used an x-ray spectrometer to determine the x-ray photon fluence. Values of DQE at low spatial frequency were at about almost 80 % at 8 keV.

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