The Hutt-Wairarapa shared service is the first stage of a plan for all three Greater Wellington region DHBS, including Capital and Coast, to share a single radiology service.
According to a statement released by the DHB, demand for a radiology service, particularly for more complex imaging, continues to grow and the merging of the services is a way of managing this demand.
More than 30,000 examinations are undertaken every year in Wairarapa.
DHB director clinical support services Tina Ririnui says there will be benefits for doctors and patients. The service will increase the range of services available locally, meaning less travel and easier access.
"It means processes and procedures across the two DHBs will be aligned and a radiologist on-site four days a week will provide greater support and patient flow.
"Increased on-site presence of a radiologist will make it easier for Wairarapa Hospital doctors to work directly with the radiologists regarding specific patient cases."
GPs will also have increased access to a liaison radiologist, who will be directly available by phone, and additional support will be available after-hours.
"The new service will make the best use of available funding in response to growing demand for radiology.
"For example, we now have a new MRI machine based in Hutt which will service the whole region."