156. New facilities which became available during the year are detailed in paragraph 218 of this report
157. In addition to general out-patient service, regular out- patient sessions were maintained at a number of clinics by staff of specialized units. Evening out-patient sessions continued to be held at 10 clinics in the more densely populated arcas. They are the Aberdeen Jockey Club Clinic, the Kowloon Hospital out-patient department, the Kwun Tong Jockey Club Clinic, the Lady Trench Polyclinic, the Li Po Chun Health Centre, the Robert Black Health Centre, the Sai Ying Pun Jockey Club Polyclinic. the Shau Kei Wan Jockey Club Polyclinic, the Violet Peel Polyclinic and the Yau Ma Tei Jockey Club Polyclinic. Sunday and public holiday clinics were also held at six of the clinics. The more remote areas of the New Territories continued to be served by two mobile dispensaries and the 'floating clinics', while the flying doctor' service to more isolated and in- accessible villages was maintained.
SPECIALIST SERVICES
158. The Department provides specialist services units in anaestbe- siology, dentistry, medicine, neuresurgery, ophthalmology, orthopaedic surgery, obstetrics and gynaecology, otorhinolaryngology, pathology. paediatrics, psychiatry, radiodiagnosis, radiotherapy, social hygiene. surgery, thoracic surgery and tuberculosis. In addition, professors of the University of Hong Kong's Faculty of Medicine act as consultants in medicine, surgery, obstetrics and gynaecology, orthopaedics, pathology and paediatrics. A number of govemment specialists act as honorary consultants to the Tung Wah group of hospitals, and others serve as part-time lecturers in the University's clinical departments.
RADIOLOGICAL SERVICES
159. The Medical and Health Department Institute of Radiology comprises five divisions:-radiodiagnosis, radiotherapy, radiation physics, radioisotope, radiobiology and clinical photography.
160. The radiodiagnostic division provides an X-ray diagnostic service mainly for government institutions, but a free consultant service is available to the Tung Wah group of hospitals and the Pok Oi Hospital in the New Territories. Consultant services are also available to medical practitioners in private practice on payment of a fee. In all, 19 static X-ray departments and three mobile chest radiography
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units were in operation with a total output of 776,766 examinations, an increase of approximately three per cent over the previous year. During 1972, a major diagnostic X-ray machine, with cincradiography, screening and television monitoring facilities, was installed at the Queen Elizabeth Hospital X-ray Department, A new Chest X-ray Department was opened at the Kwai Chung Chest Clinic.
161. The radiotherapy division based at the Queen Elizabeth and Queen Mary hospitals treated more than 90 per cent of all patients requiring radiotherapy in the whole of Hong Kong and also operates a Colony-wide cancer registry.
162. The radioisotope service is included in the radiotherapy divi- sion. Because of its modest outlay, it serves mainly government in- stitutions, but a consultant service is also available, on a limited scale, to the Tong Wah group of hospitals, and medical practitioners in private practice.
163. The radiation physics division is responsible for the opera- tion of the radiological workshop which provides a maintenance service for government radiological equipment, and also a film-badge radiation monitoring service for the whole Colony. During 1972, the latter service covered 49 government institutions with 401 radiation workers, 120 private practitioners' X-ray laboratories with 386, and industrial firms with 74. Approximately 180 visits were made to non-government premises to inspect the working conditions of radiation workers. Special attention was paid to gas mantle factories where radioactive thorium nitrate forms an integral part of the production process. These duties were in addition to the radiation physics division's main func- lion of assisting the radiotherapeutic and radiodiagnostic divisions in their routine work and the training of staff.
164. The radiobiology division is responsible for investigating radio- biological and cancer problems to help the radiotherapy division in its work. It also assists in the training of radiotherapists.
165. The Institute also undertakes the training of medical under- graduates of the Hong Kong University in clinical radiology and radiological anatomy.
166. In the field of research, the radiotherapy and radiobiology divisions are continuing their own as well as the collaborative research with the International Agency for Research on Cancer in an investiga-
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