title: A survey of 29 EMI CT machines in Britain.
abstract: During 1978/79 a survey was made of the performance characteristics of 29 EMI brain and body CT scanners in Britain. Comparative data on such performance parameters as noise, uniformity of CT numbers, low-contrast detectability, resolution, modulation transfer function (MTF) and effective photon energy were measured using a set of regular-geometry and anthropomorphic phantoms. In addition, dose profiles were obtained for a single slice using TLD and film. The results of the survey are presented; the dependence of the performance characteristics on the types of machines surveyed and the operating modes employed is discussed.
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging; D006801:Humans; D008961:Models, Structural; D011829:Radiation Dosage; D013679:Technology, Radiologic; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods; D006113:United Kingdom