Endoscopy 2016; 48(09): 837-842
DOI: 10.1055/s-0042-108434
Innovations and brief communications
© Georg Thieme Verlag KG Stuttgart · New York

Exploring the clinical potential of an automatic colonic polyp detection method based on the creation of energy maps

Glòria Fernández-Esparrach
1  Endoscopy Unit, Gastroenterology Department, Hospital Clínic, IDIBAPS, CIBEREHD, University of Barcelona, Barcelona, Spain
,
Jorge Bernal
2  Computer Science Department, Universitat Autònoma de Barcelona and Computer Vision Center, Barcelona, Spain
,
Maria López-Cerón
1  Endoscopy Unit, Gastroenterology Department, Hospital Clínic, IDIBAPS, CIBEREHD, University of Barcelona, Barcelona, Spain
,
Henry Córdova
1  Endoscopy Unit, Gastroenterology Department, Hospital Clínic, IDIBAPS, CIBEREHD, University of Barcelona, Barcelona, Spain
,
Cristina Sánchez-Montes
1  Endoscopy Unit, Gastroenterology Department, Hospital Clínic, IDIBAPS, CIBEREHD, University of Barcelona, Barcelona, Spain
,
Cristina Rodríguez de Miguel
1  Endoscopy Unit, Gastroenterology Department, Hospital Clínic, IDIBAPS, CIBEREHD, University of Barcelona, Barcelona, Spain
,
Francisco Javier Sánchez
2  Computer Science Department, Universitat Autònoma de Barcelona and Computer Vision Center, Barcelona, Spain
› Author Affiliations
Further Information

Publication History

submitted23 December 2015

accepted after revision17 April 2016

Publication Date:
10 June 2016 (online)

Background and aims: Polyp miss-rate is a drawback of colonoscopy that increases significantly for small polyps. We explored the efficacy of an automatic computer-vision method for polyp detection.

Methods: Our method relies on a model that defines polyp boundaries as valleys of image intensity. Valley information is integrated into energy maps that represent the likelihood of the presence of a polyp.

Results: In 24 videos containing polyps from routine colonoscopies, all polyps were detected in at least one frame. The mean of the maximum values on the energy map was higher for frames with polyps than without (P < 0.001). Performance improved in high quality frames (AUC = 0.79 [95 %CI 0.70 – 0.87] vs. 0.75 [95 %CI 0.66 – 0.83]). With 3.75 set as the maximum threshold value, sensitivity and specificity for the detection of polyps were 70.4 % (95 %CI 60.3 % – 80.8 %) and 72.4 % (95 %CI 61.6 % – 84.6 %), respectively.

Conclusion: Energy maps performed well for colonic polyp detection, indicating their potential applicability in clinical practice.