#37 - Training A Neural Network On Toilet Photos

What if a single smartphone photo could make colonoscopy prep more reliable? Colonoscopy can save lives through early detection of colorectal cancer, but its success depends on one stubborn detail: a clean colon. When bowel prep falls short, important findings can be missed, procedures can take longer, and patients may have to repeat the entire process. The question is simple but important: could there be an easier way for patients to know whether they are truly ready before heading to the clinic? In this episode, we explore research that puts artificial intelligence to work on exactly that problem. Using a smartphone app, patients take a photo of their final bowel movement and receive an immediate yes-or-no result about whether their preparation is adequate. We break down how the system works, from convolutional neural networks and expert clinician labeling to data augmentation that helps the model adapt to real-world conditions like poor lighting, different angles, and varying distances. We also unpack a key challenge in medical AI: overfitting, and why strong performance in a study does not always guarantee success in everyday use.The potential impact is significant. Patients in the intervention group achieved better bowel cleansing quality, suggesting a practical way to improve the consistency and effectiveness of colorectal cancer screening. At the same time, important questions remain about adenoma detection, repeat procedures, and how tools like this fit into clinical workflow. This is a fascinating example of AI solving a very human problem: reducing friction, improving preparation, and helping patients get the most out of an essential preventive test.References:An Artificial Intelligence-Guided Strategy to Reduce Poor Bowel Preparation: A Multicenter Randomized Controlled StudyGimeno-García et al. American Journal of Gastroenterology (2026)Design and validation of an artificial intelligence system to detect the quality of colon cleansing before colonoscopyGimeno-García et al. Gastroenterology and Hepatology (2023)Credits:Theme music: Nowhere Land, Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 4.0https://creativecommons.org/licenses/by/4.0/