title: CHARACTERISING THE EOS SLOT-SCANNING SYSTEM WITH THE EFFECTIVE DETECTIVE QUANTUM EFFICIENCY.
abstract: As opposed to the standard detective quantum efficiency (DQE), effective DQE (eDQE) is a figure of merit that allows comparing the performances of imaging systems in the presence of scatter rejection devices. The geometry of the EOS™ slot-scanning system is such that the detector is self-collimated and rejects scattered radiation. In this study, the EOS system was characterised using the eDQE in imaging conditions similar to those used in clinical practice: with phantoms of different widths placed in the X-ray beam, for various incident air kerma and tube voltages corresponding to the phantom thickness. Scatter fractions in EOS images were extremely low, around 2 % for all configurations. Maximum eDQE values spanned 9-14.8 % for a large range of air kerma at the detector plane from 0.01 to 1.34 µGy. These figures were obtained with non-optimised EOS setting but still over-performed most of the maximum eDQEs recently assessed for various computed radiology and digital radiology systems with antiscatter grids.
authors.affiliation: Institute of Radiation Physics, CHUV, Rue du Grand-Pré 1, CH-1007 Lausanne, Switzerland Université de Lyon, CREATIS, CNRS UMR5220, Inserm U1044, INSA-Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, Lyon, France EOS imaging, 10 rue Mercœur, 75011 Paris, France aclavel@eos-imaging.com.
authors.forename: A H
authors.initials: AH
authors.lastname: Clavel
authors.affiliation: Institute of Radiation Physics, CHUV, Rue du Grand-Pré 1, CH-1007 Lausanne, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Monnin
authors.affiliation: Université de Lyon, CREATIS, CNRS UMR5220, Inserm U1044, INSA-Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, Lyon, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Létang
authors.affiliation: Institute of Radiation Physics, CHUV, Rue du Grand-Pré 1, CH-1007 Lausanne, Switzerland.
authors.forename: F R
authors.initials: FR
authors.lastname: Verdun
authors.affiliation: EOS imaging, 10 rue Mercœur, 75011 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Darbon
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*; D014159:Transducers