title: Study on construction of a medical x-ray direct digital radiography system and hybrid preprocessing methods.
abstract: We construct a medical X-ray direct digital radiography (DDR) system based on a CCD (charge-coupled devices) camera. For the original images captured from X-ray exposure, computer first executes image flat-field correction and image gamma correction, and then carries out image contrast enhancement. A hybrid image contrast enhancement algorithm which is based on sharp frequency localization-contourlet transform (SFL-CT) and contrast limited adaptive histogram equalization (CLAHE), is proposed and verified by the clinical DDR images. Experimental results show that, for the medical X-ray DDR images, the proposed comprehensive preprocessing algorithm can not only greatly enhance the contrast and detail information, but also improve the resolution capability of DDR system.
authors.affiliation: College of Communication Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Ren
authors.affiliation: College of Communication Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wu
authors.affiliation: College of Communication Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Mijian
authors.initials: M
authors.lastname: Wang
authors.affiliation: College of Communication Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Zhongjie
authors.initials: Z
authors.lastname: Cen
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003199:Computer Systems; D003287:Contrast Media; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D055095:Optics and Photonics; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012984:Software; D014965:X-Rays
chemical_list: D003287:Contrast Media