title: Optimal steel thickness combined with computed radiography for portal imaging of nasopharyngeal cancer patients.
abstract: The poor image quality of conventional metal screen-film portal imaging system has long been of concern, and various methods have been investigated in an attempt to enhance the quality of portal images. Computed radiography (CR) used in combination with a steel plate displays image enhancement. The optimal thickness of the steel plate had been studied by measuring the modulation transfer function (MTF) characteristics. Portal images of nasopharyngeal carcinoma patients were taken by both a conventional metal screen-film system and this optimal steel and CR plate combination system. Compared with a conventional metal screen-film system, the CR-metal screen system achieves a much higher image contrast. The measured modulation transfer function (MTF) of the CR combination is greater than conventional film-screen portal imaging systems and also results in superior image performance, as demonstrated by receiver operator characteristic (ROC) analysis. This optimal combination steel CR plate portal imaging system is capable of producing high contrast portal images conveniently.
authors.affiliation: Radiation Oncology Department of the 1st Affiliated Hospital of Wenzhou Medical College, Wenzhou, Zhejiang, China, 325000.
authors.forename: Shixiu
authors.initials: S
authors.lastname: Wu
authors.forename: Xiance
authors.initials: X
authors.lastname: Jin
authors.forename: Congying
authors.initials: C
authors.lastname: Xie
authors.forename: Guoquan
authors.initials: G
authors.lastname: Cao
mesh_terms: D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000000981:diagnostic imaging*; D011856:Radiographic Image Enhancement / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013232:Steel; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014963:X-Ray Intensifying Screens
chemical_list: D013232:Steel