Radiological Physics and Technology

, Volume 1, Issue 1, pp 20–26 | Cite as

Development and performance evaluation of the second model 256-detector row CT

  • Masahiro Endo
  • Shinichiro Mori
  • Susumu Kandatsu
  • Shuji Tanada
  • Chisato Kondo
Article

Abstract

Since our initial development of the 256-detector row CT scanner (256-row CT) for four-dimensional (4D) imaging of moving organs in 2003, the results of physical performance and those in animal and human studies have suggested that this scanner may be useful in the examination of moving organs such as the heart and lungs. We have now developed a second model of the 256-row CT with improved specifications, with a scan time of 0.5 s/rotation at the highest speed and real-time reconstruction and display of dynamic 3D images (4D images). Here, we investigated the image characteristics of the new model, including spatial resolution, noise, and low-contrast detectability, as well as the dose profile and its integral in stationary phantoms. One volunteer and one patient with lung cancer were scanned, and their images were evaluated. The results show that all characteristics have been improved compared with those of the first model, with a remarkable improvement in the low-contrast detectability and slice sensitivity profile. In a contrast study, coronary arteries were clearly visualized in the normal heart without electrocardiographic gating. Movement and deformation of the tumor in the patient with lung cancer was captured in a study of a single breath cycle. The second model 256-row CT with improved characteristics may be beneficial in imaging of moving organs such as the heart and lungs, and may enable cerebral perfusion studies of the whole brain.

Keywords

Volumetric cine imaging 256-detector row CT Four-dimensional viewer Image quality 

References

  1. 1.
    Schardt P, Deuringer J, Freudenberger J, Hell E, Knupfer W, Mattern D, et al. New X-ray tube performance in computed tomography by introducing the rotating envelope tube technology. Med Phys. 2004;31:2699–706.PubMedCrossRefGoogle Scholar
  2. 2.
    Endo M, Mori S, Tsunoo T, Kandatsu S, Tanada S, Aradate H, et al. Development and performance evaluation of the first model of 4-D CT scanner. IEEE Trans Nucl Sci. 2003;50:1667–71.CrossRefGoogle Scholar
  3. 3.
    Mori S, Endo M, Tsunoo T, Kandatsu S, Tanada S, Aradate H, et al. Physical performance evaluation of a 256-slice CT scanner for 4-dimensional imaging. Med Phys. 2004;31:1348–56.PubMedCrossRefGoogle Scholar
  4. 4.
    Mori S, Endo M, Obata T, Murase K, Fujiwara H, Kandatsu S, et al. Clinical potentials of the prototype 256-detector row CT scanner. Acad Radiol. 2005;12:148–54.PubMedCrossRefGoogle Scholar
  5. 5.
    Feldkamp LA, Davis LC, Kress JW. Practical cone-beam algorithm. J Opt Soc Am. 1984;A1:612–9.CrossRefGoogle Scholar
  6. 6.
    Mori S, Endo M, Nishizawa K, Tsunoo T, Aoyama T, Fujiwara H, et al. Enlarged longitudinal dose profiles in cone-beam CT and the need for modified dosimetry. Med Phys. 2005;32:1061–9.PubMedCrossRefGoogle Scholar
  7. 7.
    Kondo C, Mori S, Endo M, Kusakabe K, Suzuki N, Hattori A, et al. Real-time volumetric imaging of human heart without electrocardiographic gating by 256-detector row computed tomography. J Comput Assist Tomogr. 2005;29:694–8.PubMedCrossRefGoogle Scholar
  8. 8.
    Sato Y, Kanmatsuse K, Inoue F, Horie T, Kato M, Kusama J, et al. Noninvasive coronary artery imaging by multislice spiral computed tomography: a novel approach for a retrospective ECG-gated reconstruction technique. Circ J. 2003;67:107–11.PubMedCrossRefGoogle Scholar
  9. 9.
    Inoue F, Sato Y, Matsumoto N, Tani S, Uchiyama T. Evaluation of plaque texture by means of multislice computed tomography in patients with acute coronary syndrome and stable angina. Circ J. 2004;68:840–4.PubMedCrossRefGoogle Scholar
  10. 10.
    Mori S, Endo M, Kondo C, Tanada S. Physical evaluation of the weighted Feldkamp algorithms applied to the 256-detector row CT scanner for volumetric cine imaging. Acad Radiol. 2006;13:701–12.PubMedCrossRefGoogle Scholar
  11. 11.
    Miles KA, Griffiths MR. Perfusion CT; a worthwhile enhancement? Brit J Radiol. 2003;76:220–31.PubMedCrossRefGoogle Scholar
  12. 12.
    Mori S, Obata T, Nakajima N, Ichihara N, Endo M. Volumetric perfusion CT using 256-detector row CT scanner: preliminary study with healthy porcine model. Am J Neuroradiol. 2006;26:2536–41.Google Scholar
  13. 13.
    Keall PJ, Joshi S, Vedam SS, Siebers JV, Kini VR, Mohan R. Four-dimensional radiotherapy planning for DMCL-based respiratory motion tracking. Med Phys. 2005;32:942–51.PubMedCrossRefGoogle Scholar
  14. 14.
    Mori S, Baba M, Yashiro T, Komatsu S, Kandatsu S, Endo M. Volumetric cine imaging for four-dimensional radiation therapy planning using the second model of the 256-detector row CT-scanner: initial experience in lung cancer. Eur J Radiol Extra. 2006;57:71–3.CrossRefGoogle Scholar

Copyright information

© Japanese Society of Radiological Technology and Japan Society of Medical Physics 2007

Authors and Affiliations

  • Masahiro Endo
    • 1
  • Shinichiro Mori
    • 2
  • Susumu Kandatsu
    • 2
  • Shuji Tanada
    • 2
  • Chisato Kondo
    • 3
  1. 1.Department of Planning and ManagementNational Institute of Radiological SciencesChibaJapan
  2. 2.Research Center for Charged Particle TherapyNational Institute of Radiological SciencesChibaJapan
  3. 3.Department of Radiology, School of MedicineTokyo Women’s Medical UniversityTokyoJapan

Personalised recommendations