Improvement of legion detectability and development of further radiation reduction at 64-detector CT

• Project/Area Number: 20591449
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Radiation science
• Research Institution: Kumamoto University
• Principal Investigator: FUNAMA Yoshinori Kumamoto University, 大学院・生命科学研究部, 助教 (30380992)
• Co-Investigator(Kenkyū-buntansha): AWAI Kazuo 広島大学, 大学院・医歯薬学総合研究科, 教授 (30294573)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: CT / 検出能 / 被曝線量 / 画質 / CNR / ATCM / Image noise / Radiation dose / Detectability / Helical scan / Axial scan / AEC technique / Dual energy subtraction

Research Abstract

The purpose of our study was to deal with improvement of legion detectability and further reduction of radiation dose at 64-detector CT. First, we have studied about comparison of step-and-shoot- and helical- scan. Helical scan realized the improvement of legion detectability and enabled the stable CT examination. Second, we have studied the development of contrast-to-noise ratio (CNR) based modulation technology to further reduce the radiation dose. Novel CNR technology enabled the both dose reduction and improved image quality in CT scanning.

Research Products

• [Journal Article] Cone-beam technique for 64-MDCT of lung : image quality comparison with stepwise (step-and-shoot) technique (2009)
  • Author(s): Funama Y, Awai K, Taguchi K, et al.
  • Journal Title: American Journal of Roentgenology 192(1) Pages: 273-278
  • Peer Reviewed
• [Journal Article] Image noise and radiation dose using an automatic tube current modulation technique at 64-detector computed tomography : effect of off-center patient position, bowtie filter type, and scan projection radiograph (2009)
  • Author(s): Funama Y, Awai K, Liu D, et al.
  • Journal Title: J Comput Assist Tomogr 33 Pages: 973-977
  • Peer Reviewed
• [Journal Article] Image noise and radiation dose using an automatic tube current modulation technique at 64-detector computed tomography : effect of off-center patient position, bowtie filter type, and scan projection radiograph (2009)
  • Author(s): Funama Y
  • Journal Title: J Comput Assist Tomogr. 33 Pages: 973-977
  • Peer Reviewed
• [Journal Article] Cone-beam technique for 64-MDCT of lung : image quality comparison with stepwise (step-and-shoot)technique (2009)
  • Author(s): Funama Y
  • Journal Title: American Journal of Roentgenology 192(1) Pages: 273-278
  • Peer Reviewed
• [Presentation] CNR-based CT Automatic Exposure Control System : Physics Principles, Scanning Technique, and Clinical Implementation (2010)
  • Author(s): Sugaya Y, Funama Y Awai K, et al.
  • Organizer: Radiological Society of North America (RSNA)
  • Place of Presentation: McCormick Place, Chicago, USA
  • Year and Date: 2010-11-28
• [Presentation] CNR-based CT Automatic Exposure Control System : Physics Principles, Scanning Technique, and Clinical Implementation (2010)
  • Author(s): Sugaya Y
  • Organizer: Radiological Society of North America (RSNA)
  • Place of Presentation: McCormic Place, Chicago, USA
  • Year and Date: 2010-11-28
• [Presentation] A novel dose modulation technique at abdominal multidetector CT based on contrast-to-noise ratio : theoretical background and initial clinical experience (2009)
  • Author(s): Funama Y, Awai K, Irie T, et al.
  • Organizer: Radiological Society of North America
  • Place of Presentation: McCormick Place, Chicago, USA, RSNA
  • Year and Date: 2009-12-02
• [Presentation] A novel dose modulation technique at abdominal multidetector CT based on contrast-to-noise ratio : theoretical background and initial clinical experience (2009)
  • Author(s): Funama Y
  • Organizer: Radiological Society of North America(RSNA)
  • Place of Presentation: McCormic Place, Chicago, USA
  • Year and Date: 2009-12-02
• [Presentation] 肺野のHelical HRCTスキャンとAxial HRCTスキャンの比較 (2008)
  • Author(s): 筧清孝、羽手村昌宏、橋田昌弘、船間芳憲
  • Organizer: 日本放射線技術学会総会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2008-04-04