This document discusses research into developing cellphone cameras that can detect cancer and see through walls. It outlines potential applications such as detecting tumors, diagnosing disease through breath analysis, and performing low-cost cancer screening. Currently, PET scans used for cancer screening are very expensive, costing an average of $4,900 per scan. The document proposes using cameras in hospitals that could detect cancer while also serving surveillance purposes, providing benefits like reduced costs, time savings, and lower radiation exposure compared to current screening methods. It includes research on potential user personas for such a product: a compassionate doctor seeking more efficient cancer detection and less patient stress, and a homemaker worried about cancer but unable to afford existing screening options.