Defining radiological progression in children who have ingested multiple magnets using a novel objective tool applied to abdominal radiographs

A 3x3 grid system overlaying the abdominal radiograph provides an objective tool to evaluate magnet progression. We suggest an imaging protocol consisting of at least three abdominal radiographs within the first 36-48 h, with risk-based adjustment of imaging frequency thereafter. Combined with standardisation of radiograph timing, the grid system may facilitate earlier intervention in those with non-progression, safe early discharge in those without injury, and overall reduced radiation exposure.