Table 3:

Frame elements in Rad-SpatialNet

Element	Description
Elements with respect to a spatial trigger
Figure	The object whose location is described through the spatial trigger (usually refers to finding/location/disorder/device/anatomy/tip/port)
Ground	The anatomical location of the trajector described (usually an anatomical structure)
Hedge	Uncertainty expressions used by radiologists (e.g., ‘ could be related to’, ‘may concern for’ etc.)
Diagnosis	Clinical condition/disease associated with finding/observation suggested as differential diagnoses, usually appears after the hedge related terms
Reason	Clinical condition/disease that acts as the source of the finding/observation/disorder
Relative Position	Terms used for describing the orientation of a radiological entity wrt to an anatomical location (e.g., ‘posteriorly’ in “Blunting of the cosmiddlehrenic sulci posteriorly is still present”, ‘high’ in “The UV line tip is high in the right atrium.”)
Distance	The actual distance of the finding or device from the anatomical location (e.g., ‘1 cm’ in “ETT tube is 1 cm above the carina.”)
Position Status	Any position-related information, usually in context to a device (e.g., ‘terminates’ in “A right PIC catheter terminates in the mid SVC.”)
Associated Process	Any process/activity associated with a spatial relation (e.g., ‘intubation’ in “may be related to recent intubation”)
Elements with respect to a radiological entity
Status	Indicating status of entities (e.g., ‘stable’, ‘normal’, ‘mild’)
Morphologic	Indicating shape (e.g., ‘rounded’)
Density	Terms referring to densities of findings/observations (e.g., ‘hypodense’, ‘lucent’)
Modality	Indicating modality characteristics (e.g., ‘attenuation’)
Distribution	Indicating distribution patterns (e.g., ‘scattered’, ‘diffuse’)
Temporal	Indicating any temporality (e.g., ‘new’, ‘chronic’)
Composition	Indicating composition of any radiological observation (e.g., ‘calcified’)
Negation	The negated phrase related to a finding/observation (e.g., ‘without evidence of’)
Size	The actual size of any finding/observation (e.g., ‘14-mm’ describing the size of a lytic lesion)
Laterality	Indicating side (e.g., ‘left’, ‘bilateral’)
Quantity	Indicating the quantity of any radiological entity (e.g., ‘multiple’, ‘few’)