Endosc Int Open 2015; 03(05): E380-E392
DOI: 10.1055/s-0034-1392513
Review
© Georg Thieme Verlag KG Stuttgart · New York

Biophotonic endoscopy: a review of clinical research techniques for optical imaging and sensing of early gastrointestinal cancer

Sergio Coda
1  Section of Gastroenterology and Hepatology, Department of Medicine, Imperial College London, London, United Kingdom
2  Photonics Group, Department of Physics, Imperial College London, London, United Kingdom
3  Endoscopy Unit, Department of Gastroenterology, Charing Cross Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom
4  Department of Endoscopy, North East London NHS Treatment Centre, Care UK, London, United Kingdom
,
Peter D. Siersema
5  Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, The Netherlands
,
Gordon W. H. Stamp
2  Photonics Group, Department of Physics, Imperial College London, London, United Kingdom
6  Experimental Histopathology Laboratory, Cancer Research UK London Research Institute, London, United Kingdom
7  Department of Histopathology, Imperial College London, London, United Kingdom
,
Andrew V. Thillainayagam
1  Section of Gastroenterology and Hepatology, Department of Medicine, Imperial College London, London, United Kingdom
2  Photonics Group, Department of Physics, Imperial College London, London, United Kingdom
3  Endoscopy Unit, Department of Gastroenterology, Charing Cross Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom
› Author Affiliations
Further Information

Publication History

submitted 28 September 2014

accepted after revision 07 May 2015

Publication Date:
08 September 2015 (online)

Detection, characterization, and staging constitute the fundamental elements in the endoscopic diagnosis of gastrointestinal diseases, but histology still remains the diagnostic gold standard.

New developments in endoscopic techniques may challenge histopathology in the near future. An ideal endoscopic technique should combine a wide-field, “red flag” screening technique with an optical contrast or microscopy method for characterization and staging, all simultaneously available during the procedure. In theory, biophotonic advances have the potential to unite these elements to allow in vivo “optical biopsy.”

These techniques may ultimately offer the potential to increase the rates of detection of high risk lesions and the ability to target biopsies and resections, and so reduce the need for biopsy, costs, and uncertainty for patients. However, their utility and sensitivity in clinical practice must be evaluated against those of conventional histopathology.

This review describes some of the most recent applications of biophotonics in endoscopic optical imaging and metrology, along with their fundamental principles and the clinical experience that has been acquired in their deployment as tools for the endoscopist. Particular emphasis has been placed on translational label-free optical techniques, such as fluorescence spectroscopy, fluorescence lifetime imaging microscopy (FLIM), two-photon and multi-photon microscopy, second harmonic generation (SHG) and third harmonic generation (THG) imaging, optical coherence tomography (OCT), diffuse reflectance, Raman spectroscopy, and molecular imaging.