Radiation exposure in computed tomography: comparison of adult and paediatrics radiology practice in Serbia

There are 90 CT units operating in Serbia, with tenfold increase in the last decade, resulting with annual total of approximately 350000 procedures. The objective of this paper is to assess typical patient dose from adult and paediatric CT examinations. Initially, three hospitals (two general hospitals performing examination of adults and a dedicated paediatric hospital) were enrolled into the study. The hospitals have high workload. Both multi detector CT (MDCT) and single detector CT (SDCT) were included, to represent typical practice in Serbia. Typical patients exposure parameters based on predefined protocol for CT examinations of head, chest, abdomen and pelvis were collected. Data were taken form CT unit displey. This includes exposure parameters and volumetric and weighted CT dose index (CTDI). Dose length product (DLP) was calculated from CTDI values and information on typical scan length. Also, the effective dose was estimated. DLP values were 575 mGy·cm, 310 mGy·cm, 703 mGy·cm and 470 mGy·cm for head, chest, abdomen and pelvic CT respectively in general hospital using SDCT and 325 mGy·cm, 160 mGy·cm, 321 mGy·cm and 140 mGy·cm for the same examination using MDCT. In paediatric hospital these values were 525 mGy·cm, 230 mGy·cm , 385 mGy·cm and 330 mGy·cm. The assessed patients’ doses in terms of CTDI and DLP were well below reference levels and in accordance with surveys from other countries, although the scope for dose reduction trough optimisation of the examination protocol was observed.