Accuracy of the size estimation in wireless capsule endoscopy: calibrating the M2A PillCam (with video) - 23/08/11
Reprint requests: Florian Graepler, MD, Department of Internal Medicine I, Medical University Clinic Tübingen, Otfried-Müller-Str. 10, D-72076 Tübingen, Germany.Tübingen, Germany
Abstract |
Objective |
To describe the accuracy and precision of a size estimation in wireless capsule endoscopy (WCE) and to develop a simple device that facilitates learning of an exact size estimation in WCE.
Design |
A prospective study with an animal model. Seventy-five medical students were compared with 21 physicians not performing WCEs and 21 experts actively performing WCEs.
Interventions |
Video sequences were recorded with a PillCam wireless endoscope in a porcine small-bowel model after implantation of “lesions” of defined sizes. Volunteers estimated the diameter of these “lesions” with and without the use of a calibrator device, which was a picture from a black-and-white grid taken with the PillCam in direct contact with the transparent dome.
Results |
The students overestimated the diameters of the lesions by 26%. The physicians and experts underestimated the diameters by 32% and 31%, respectively. With the help of the calibrator device, the students underestimated the diameters by 15%. Physicians underestimated the diameters by 21%, whereas experts still underestimated the diameters by 35%. The interindividual log-scale standard deviation (SD) of the estimated diameters from the true diameter decreased during training in all groups, whereas intraindividual SDs decreased in students and increased in experts.
Limitation |
An animal model.
Conclusions |
All investigators agree better when a calibrating device was offered. Experts who performed more than 400 WCEs tended to be more precise.
Le texte complet de cet article est disponible en PDF.Abbreviations : CV, SD, WCE
Plan
Vol 67 - N° 6
P. 924-931 - mai 2008 Retour au numéro
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