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Follicular Unit Classification Method Using Angle Variation of Boundary Vector for Automatic Hair Implant System

  • Received : 2014.08.18
  • Accepted : 2015.07.22
  • Published : 2016.02.01

Abstract

This paper presents a novel follicular unit (FU) classification method based on an angle variation of a boundary vector according to the number of hairs in several FU images. The recently developed robotic FU harvest system, ARTAS, classifies through digital imaging the FU type based on the number of hairs with defects in the contour and outline profile of the FU of interest. However, this method has a drawback in that the FU classification is inaccurate because it causes unintended defects in the outline profile of the FU. To overcome this drawback, the proposed method classifies the FU's type by the number of variation points that are calculated using an angle variation a boundary vector. The experimental results show that the proposed method is robust and accurate for various FU shapes, compared to the contour-outline profile FU classification method of the ARTAS system.

Acknowledgement

Grant : Local-based medical device/robot development & medical IT convergence for small and medium enterprise revitalization project

Supported by : ETRI

References

  1. S. Okuda, "The Study of Clinical Experiments of Hair Transplantation," Japanese J. Dermatology, vol. 46, no. 135, 1939.
  2. W.P. Unger, "Delineating the Safe Donor Area for Hair Transplanting," American J. Cosmetic Surgery, vol. 11, 1994, pp. 239-243. https://doi.org/10.1177/074880689401100402
  3. N. Orentreich, "Autografts in Alopecias and Other Selected Dermatological Conditions," Annals New York Academy Sci., vol. 83, Nov. 1959, pp. 463-479.
  4. R.M. Bernstein and W.R. Rassman, "Follicular Unit Transplantation," Issue Adv. Cosmetic Surgery, Dermatologic Clinics, vol. 23, no. 3, 2005, pp. 393-414.
  5. W.R. Rassman et al., "Follicular Unit Extraction: Minimally Invasive Surgery for Hair Transplantation," Dermatologic Surgery, vol. 28, no. 8, Aug. 2002, pp. 720-728. https://doi.org/10.1046/j.1524-4725.2002.01320.x
  6. FUE - A Few Words about Transplant Methods, The Blog, SURE HAIR INTERNATIONAL. Accessed Nov. 9, 2014. http://surehairtransplants.com/fue-words-transplant-methods
  7. Bauman Medical Group, P.A., Hair Restoration for Men and Women, BAUMAN MEDICAL GROUP. Accessed Nov. 9, 2014. http://baumanmedical.com
  8. Follicular Unit Extraction (FUE) Hair Transplant, Follicular Unit Extraction, Hair Transplant Network.com. Accessed Nov. 9, 2014. http://www.hairtransplantnetwork.com/Hair-Loss-Treatments/follicular-unit-extraction.asp
  9. L.M. Bicknell et al., "Follicular Unit Extraction Hair Transplant Harvest: A Review of Current Recommendations and Future Considerations," Dermatology Online J., vol. 20, no. 3, Mar. 2014.
  10. R.M. Rashid and B.L.T. Morgan, "Follicular Unit Extraction Hair Transplant Automation: Options in Overcoming Challenges of the Latest Technology in Hair Restoration with the Goal of Avoiding the Line Scar," Dermatology Online J., vol. 18, no. 9, Sept. 2012.
  11. M. Onda et al., "Novel Technique of Follicular Unit Extraction Hair Transplantation with a Powered Punching Device," Dermatology Surgery, vol. 34, no. 12, Dec. 2008, pp. 1683-1688.
  12. NeoGraft(R) Automated FUE Hair Transplant System, Procedure Overview, NeoGraft. Accessed Nov. 9, 2014. http://neograftdocs.com/procedure-overview/neograft-automatedfue-hair-transplant-System/
  13. Minimally Invasive Dissection, ARTAS Robotics System, RESTORATION ROBOTICS. Accessed Nov. 9, 2014. http://restorationrobotics.com/minimally-invasive-dissection/
  14. R.M. Rashid et al., "Follicular Unit Extraction with Artas Robotic Hair Transplant System: An Evaluation of FUE Yield," Dermatology Online J., vol. 20, no. 4, Apr. 2014.
  15. S.A. Qureshi and M. Bodduluri, System and Method for Classifying Follicular Units, US Patent 7,477,782 B2, filed Aug. 25, 2006, issued Jan. 13, 2009.
  16. S.A. Qureshi and M. Bodduluri, System and Method for Classifying Follicular Units, US Patent 7,627,157 B2, filed Aug. 24, 2007, issued Dec. 1, 2009.
  17. M. Bodduluri, P.L. Gildenberg, and D.E. Caddes, System and Methods for Aligning a Tool with a Desired Location or Object, US Patent 7,962,192 B2, filed Apr. 28, 2006, issued June 14, 2011.
  18. S.A. Qureshi and M.G. Canales, System and Method for Harvesting and Implanting Hair Using Image-Generated Topological Skin Models, US Patent 8,048,090 B2, filed Mar. 11, 2009, issued Nov. 1, 2011.
  19. S.A. Qureshi and M.G. Canales, System and Method for Harvesting and Implanting Hair Using Image-Generated Topological Skin Models, US Patent 8,361,085 B2, filed Sept. 23, 2011, issued Jan. 29, 2013.
  20. M. Bodduluri et al., System and Method for Harvesting and Implanting Hair Using Image-Generated Topological Skin Models, US Patent 8,454,627 B2, filed Jan. 6, 2012, issued June 4, 2013.
  21. S.A. Qureshi and M. Bodduluri, System and Method for Counting Follicular Units, US Patent 8,199,983 B2, filed Aug. 24, 2007, issued June 12, 2012.
  22. S.A. Qureshi and M. Bodduluri, System and Method for Counting Follicular Units, US Patent 8,290,229 B2, filed May 16, 2012, issued Oct. 16, 2012.
  23. J.W. Shin et al., "Characteristics of Robotically Harvested Hair Follicles in Koreans," J. American Academy Dermatology, vol. 72, no. 1, Jan. 2015, pp. 146-150. https://doi.org/10.1016/j.jaad.2014.07.058
  24. Trace Object in Binary Image - MATLAB bwtraceboundary, Documentation, MathWorks. Accessed Nov. 9, 2014. http://kr.mathworks.com/help/images/ref/bwtraceboundary.html