The Diagnostic Imaging Dataset (DID) is a central collection of detailed information about diagnostic imaging tests carried out on NHS patients, extracted from local radiology information systems and submitted monthly.
It captures information about referral source and patient type, details of the test (type of test and body site), demographic information such as GP registered practice, patient postcode, ethnicity, gender and date of birth, plus items about waiting times for each diagnostic imaging event, from time of test request through to time of reporting.
The DID enables analysis of demographic and geographic variation in access to different test types and different providers. Further information on the benefits of DID are available via the DID website.
The data set includes information on imaging tests carried out from 1 April 2012. It does not include the images that are produced as a result of these tests.
The data is linked to Hospital Episode Statistics, through the HES-DID linkage. This enables users to analyse acute secondary care pathways for patients receiving diagnostic imaging tests in England. This analysis could help to identify trends and variation in patient outcomes and be used to improve services for patients.
The linkage adheres to strict information governance procedures and customers have to make a formal application and sign a legally binding data sharing contract to access the data.
Aggregated data at Trust level is available via the NHS England DID webpage.
NHS staff, and other authorised persons, can explore the non-patient identifiable data using iView.
The detailed data, including that which is linked through the Hospital episode statistics, is only available through the Data Access Request Service, and users have to prove a valid legal case for needing access to the information.