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has_target
Arguments
A has_target relationship associates either an intervention or an investigation to a locus.
Entities do not have to have relationships
Interventions and investigations are not required to take part in a has_target relationship: some will have no locus specified:
- For example,
- "He also had a PET scan."
- No locus is ever mentioned for the PET scan, it being a whole-body scan. No has_target relationship will be created.
- For example,
- "This 42 year old smoker presented with a severe cough and weight loss. An x-ray has been requested."
- Although we might guess a locus of "chest" for the "x-ray", it is not mentioned in the text. No has_target relation will be created.
Inferring relations with clinical knowledge
If the locus of an intervention or investigations can only be inferred using clinical knowledge, then it will still be annotated
- For example,
- "There was evidence of neurological involvement: she has become forgetful, and at times confused. A CT scan showed atrophy. where was no evidence of brain metastases."
- We might infer that it was the scan that showed metastases, and therefore it was a scan of the brain.
- a relation will be created associating "CT scan" and "brain"
has_target and multiple Loci
An intervention or investigation may have several loci. One has_target relation will be created for each locus.
- For example,
- "A CT scan of her abdomen and thorax"
- A has_target relationship will be created associating "CT scan" with "abdomen"
- A second has_target relationship will be created associating "CT scan" with "thorax"
- (Note that the general guideline on sets and conjunctions requires "CT scan" to be annotated as a single investigation)