Radiological Physics and Technology

, Volume 1, Issue 2, pp 137–143 | Cite as

Development of functional chest imaging with a dynamic flat-panel detector (FPD)

  • Rie Tanaka
  • Shigeru Sanada
  • Masaki Fujimura
  • Masahide Yasui
  • Kazuya Nakayama
  • Takeshi Matsui
  • Norio Hayashi
  • Osamu Matsui
Article

Abstract

Dynamic FPD permits the acquisition of distortion-free radiographs with a large field of view and high image quality. In the present study, we investigated the feasibility of functional imaging for evaluating the pulmonary sequential blood distribution with an FPD, based on changes in pixel values during cardiac pumping. Dynamic chest radiographs of seven normal subjects were obtained in the expiratory phase by use of an FPD system. We measured the average pixel value in each region of interest that was located manually in the heart and lung areas. Subsequently, inter-frame differences and differences from a minimum-intensity projection image, which was created from one cardiac cycle, were calculated. These difference values were then superimposed on dynamic chest radiographs in the form of a color display, and sequential blood distribution images and a blood distribution map were created. The results were compared to typical data on normal cardiac physiology. The clinical effectiveness of our method was evaluated in a patient who had abnormal pulmonary blood flow. In normal cases, there was a strong correlation between the cardiac cycle and changes in pixel value. Sequential blood distribution images showed a normal pattern at determined by the physiology of pulmonary blood flow, with a symmetric distribution and no blood flow defects throughout the entire lung region. These findings indicated that pulmonary blood flow was reflected on dynamic chest radiographs. In an abnormal case, a defect in blood flow was shown as defective in color in a blood distribution map. The present method has the potential for evaluation of local blood flow as an optional application in general chest radiography.

Keywords

Functional imaging Dynamic chest radiography Flat-panel detector Blood flow Visualization Image subtraction 

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Copyright information

© Japanese Society of Radiological Technology and Japan Society of Medical Physics 2008

Authors and Affiliations

  • Rie Tanaka
    • 1
  • Shigeru Sanada
    • 1
  • Masaki Fujimura
    • 2
  • Masahide Yasui
    • 2
  • Kazuya Nakayama
    • 1
  • Takeshi Matsui
    • 3
  • Norio Hayashi
    • 3
  • Osamu Matsui
    • 4
  1. 1.Department of Radiological Technology, Graduate School of Medical ScienceKanazawa UniversityKanazawaJapan
  2. 2.Department of Cellular Transplantation Biology, Graduate School of Medical ScienceKanazawa UniversityKanazawaJapan
  3. 3.Department of RadiologyKanazawa University HospitalKanazawaJapan
  4. 4.Department of Radiology, Graduate School of Medical ScienceKanazawa UniversityKanazawaJapan

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