title: The application of image quality measurements for digital angiography.
abstract: The image quality (IQ) evaluation of a charge-coupled device (CCD)-based digital angiography system was assessed with respect to modulation transfer function and noise power spectrum. These values were used to calculate the system's frequency-dependent detective quantum efficiency (DQE). The X-ray image detector was an image intensifier (II) lens coupled to a CCD camera. Two measurement setups were used. Setup A is standard IQ assessment, while Setup B more closely represented clinical conditions (polymethyl methacrylate (PMMA) of varying thickness placed between the X-ray tube and II, with test object positioned between PMMA slices 30 cm from the II). Exposure parameters varied according to automatic brightness control settings. Setup B included X-ray radiation scattered by the patient-PMMA. A clinical DQE, describing the transmission of the input signal-to-noise ratio associated with both primary and secondary X-ray spectra, was defined.
authors.affiliation: Dipartimento di Fisica, Università di Trieste, Via Valerio 2, 34100 Trieste, Italy. angela.peterzol@insa-lyon.fr
authors.forename: A
authors.initials: A
authors.lastname: Peterzol
authors.forename: R
authors.initials: R
authors.lastname: Padovani
authors.forename: E
authors.initials: E
authors.lastname: Quai
authors.forename: E
authors.initials: E
authors.lastname: Vano
authors.forename: C
authors.initials: C
authors.lastname: Prieto
authors.forename: P
authors.initials: P
authors.lastname: Aviles
mesh_terms: D000792:Angiography / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011786:Quality Control; D011856:Radiographic Image Enhancement / Q000379:methods; D013679:Technology, Radiologic; D014963:X-Ray Intensifying Screens; D014965:X-Rays
chemical_list: D019904:Polymethyl Methacrylate