Invention on Instagram: "Before a patient begins radiotherapy, a custom mask is created to ensure perfect positioning during treatment. The material starts as a flat sheet of perforated thermoplastic that is warmed in hot water until it becomes soft and flexible. Once pliable, it is gently placed over the patient’s face and shoulders while they lie on the treatment table, allowing the mask to contour precisely to their features. As the material cools, it hardens into a firm but comfortable shell