Article

Radiological Physics and Technology

, Volume 2, Issue 1, pp 77-86

Embossed radiography utilizing energy subtraction

  • Akihiro OsawaAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine Email author 
  • , Manabu WatanabeAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine
  • , Eiichi SatoAffiliated withDepartment of Physics, Iwate Medical University
  • , Hiroshi MatsukiyoAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine
  • , Toshiyuki EnomotoAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine
  • , Jiro NagaoAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine
  • , Purkhet AbderyimAffiliated withDepartment of Computer and Information Sciences, Faculty of Engineering, Iwate University
  • , Katsuo AizawaAffiliated withTokyo Medical University
  • , Etsuro TanakaAffiliated withDepartment of Nutritional Science, Faculty of Applied Bio-science, Tokyo University of Agriculture
    • , Hidezo MoriAffiliated withDepartment of Cardiac Physiology, National Cardiovascular Center Research Institute
    • , Toshiaki KawaiAffiliated withElectron Tube Division #2, Hamamatsu Photonics K.K
    • , Shigeru EharaAffiliated withDepartment of Radiology, School of Medicine, Iwate Medical University
    • , Shigehiro SatoAffiliated withDepartment of Microbiology, School of Medicine, Iwate Medical University
    • , Akira OgawaAffiliated withThe 3rd Department of Surgery, Toho University School of MedicineDepartment of Neurosurgery, School of Medicine, Iwate Medical University
    • , Jun OnagawaAffiliated withThe 3rd Department of Surgery, Toho University School of MedicineDepartment of Electronics, Faculty of Engineering, Tohoku Gakuin University

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Currently, it is difficult to carry out refraction-contrast radiography by using a conventional X-ray generator. Thus, we developed an embossed radiography system utilizing dual-energy subtraction for decreasing the absorption contrast in unnecessary regions, and the contrast resolution of a target region was increased by use of image-shifting subtraction and a linear-contrast system in a flat panel detector (FPD). The X-ray generator had a 100-μm-focus tube. Energy subtraction was performed at tube voltages of 45 and 65 kV, a tube current of 0.50 mA, and an X-ray exposure time of 5.0 s. A 1.0-mm-thick aluminum filter was used for absorbing low-photon-energy bremsstrahlung X-rays. Embossed radiography was achieved with cohesion imaging by use of the FPD with pixel sizes of 48 × 48 μm, and the shifting dimension of an object in the horizontal direction ranged from 100 to 200 μm. At a shifting distance of 100 μm, the spatial resolutions in the horizontal and vertical directions measured with a lead test chart were both 83 μm. In embossed radiography of non-living animals, we obtained high-contrast embossed images of fine bones, gadolinium oxide particles in the kidney, and coronary arteries approximately 100 μm in diameter.

Keywords

Embossed radiography Digital subtraction Energy subtraction Contrast resolution Polychromatic X-rays