Fig. 1From: A novel training simulator for portable ultrasound identification of incorrect newborn endotracheal tube placement – observational diagnostic accuracy study protocolLow-cost ultrasound simulator. a The beef gelatine and psyllium fiber block, with cut-off 10 mL syringe barrel. b With cut-off 10 mL syringe barrel being used to create staggered hollow cylinders within the block. c Block with staggered hollow cylinders, with retained plug from cylinder creation. More superior cylinder is simulated trachea (white arrow), and more inferior cylinder is simulated esophagus (black arrow). d Plug partial insertion into more inferior cylinder (model esophagus)Back to article page