Non-radiological technique for 3D imaging of intestinal endoscopes: computerised graphical 3D representation of endoscope and skeleton

  • R. S. Rowland
  • G. D. Bell
Article

Abstract

Colorectal cancer is a common malignancy but as yet there is no agreement regarding the optimal method for screening. Colonoscopy is theoretically the investigation of choice. The examination can, however, be difficult to perform and the average trainee requires at least 200 supervised examinations to become proficient. Colonoscopy takes on average about half an hour per patient and sedation is normally required because of painful instrument looping. The authors previously developed a non-radiological method of visualising the path of the endoscope using magnetic drive coils under the patient and a chain of sensors in the biopsy channel of the instrument. The computer-generated greyscale images produced in real time were deemed unsatisfactory and the anatomical markers confusing. A new computer graphics system is decribed in which a much more realistic endoscope and, if necessary, skeleton can be produced. The wire-frame octagonal representation should help in the detailed analysis of colonoscopy using existing endoscopes and aid in future computer design and testing of novel instruments incorporating worm or snake-like properties.

Keywords

Colonoscopy Endoscopy 3D computerised magnetic imaging 

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References

  1. Bell, G. D., Saunders, B., Williams, C. B., Pitt, R. andBladen, J. (1996): ‘Measurement of insertion depth during flexible sigmoidoscopy (FS) or colonoscopy by electromagnetic imaging (EMI): implications for colorectal cancer screening programmes’,Gut 1996,39, (Suppl. 1), A26 (abstract)Google Scholar
  2. Bladen, J. S., Anderson, A. P., Bell, G. D., Rameh, B. andEvans, B. (1993): ‘Non-radiological technique for three dimensional imaging of intestinal enodoscopes’,Lancet,341, pp. 719–22CrossRefGoogle Scholar
  3. Bladen, J. S. (1995): ‘Imaging medical endoscopes in three dimensions using magnetic fields’. PhD thesis, University of Sheffield, UKGoogle Scholar
  4. Grundfest, W. S., Burdick, J. W. andSlatkin, A. B. (1994): ‘Robotic endoscopy’. US patent no. 5337732, August 16 1994Google Scholar
  5. Khullar, S. K. andDiSario, J. A. (1997): ‘Colon cancer screening. Sigmoidoscopy or colonoscopy?in Rex, D. K. (Ed.) ‘Gastrointestinal Endoscopy Clinics of North America. Evolving Issues in Colon Endoscopy? Vol. 7, No. 3, pp. 365–386Google Scholar
  6. Lieberman, D. A. (1995): ‘Cost-effectiveness model for colon cancer screening’,Gastroenterology,109, pp. 1781–1790CrossRefGoogle Scholar
  7. Mosse, C. A., Mills, T. N., Bell, G. D. andSwain, C. P. (1997): ‘Forces exerted by the endoscopist on the colonoscope during colonoscopy’,Gut 40, (suppl 1), A40 (abstract)Google Scholar
  8. Mosse, C. A., Mills, T. N., Bell, G. D., andSwain, C. P. (1998): ‘Device for measuring the forces exerted on the shaft of an endoscope during colonoscopy’,36, pp. 186–190Google Scholar
  9. Parry, B. R. andWilliams, S. M. (1991): ‘Competency and the colonoscopist: A learning curve’,Aust. N.Z.J. Surg.,61, pp. 419–422Google Scholar
  10. Saunders, B. P., Bladen, J. S., Williams, C. B. andBell, G. D. (1995): ‘First clinical results with a real-time, electronic imager as an aid to colonoscopy’,Gut,36, pp. 913–917Google Scholar
  11. Williams, C. B., Saunders, B. P. Bell, G. D., Bladen, J. S., Gilles, D. F. andGuy, C. M. (1997): ‘Real-time magnetic three-dimensional imaging of flexible endoscopy,’in Rex, D. K. (Ed.): ‘Gastrointestinal endoscopy clinics of North America. Evolving issues in colon endoscopy’ Vol.7, No. 3, pp. 469–476Google Scholar

Copyright information

© IFMBE 1998

Authors and Affiliations

  • R. S. Rowland
    • 1
  • G. D. Bell
    • 2
  1. 1.RMR Systems LimitedKirtonUK
  2. 2.Faculty of Medical Sciences, Sunderland University, Endoscopy UnitSunderland Royal HospitalSunderlandUK

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