Finds the imaging service request with the specified Accession Number, Patient ID, and the name of the issuer of the Patient ID.
accessionNumber
A departmental IS-generated number that identifies the order for the Imaging Service Request.
patientID
Primary hospital identification number or code for the Patient.
issuerOfPatientID
Name of healthcare provider that issued the Patient ID.
The image service request if found, null otherwise.
For an example refer to AddImagingServiceRequest