Effective dose delivered by conventional radiology to Aosta Valley population between 2002 and 2009

Abstract

Objective: Medical diagnostic procedures can be considered the main man-made source of ionising radiation exposure for the population. Conventional radiography still represents the largest contribution to examination frequency. The present work evaluates procedure frequency and effective dose from the majority of conventional radiology examinations performed at the Radiological Department of Aosta Hospital from 2002 to 2009.

Method: Effective dose to the patient was evaluated by means of the software PCXMC. Data provided by the radiological information system allowed us to obtain collective effective and per caput dose.

Results: The biggest contributors to per caput effective dose from conventional radiology are vertebral column, abdomen, chest, pelvis and (limited to females) breast. Vertebral column, pelvis and breast procedures show a significant dose increment in the period of the study. The mean effective dose per inhabitant from conventional radiology increased from 0.131 mSv in 2002 to 0.156 mSv in 2009. Combining these figures with those from our study of effective dose from CT (0.55 mSv in 2002 to 1.03 mSv in 2009), the total mean effective dose per inhabitant increased from 0.68 mSv to 1.19 mSv. The contribution of CT increased from 81% to 87% of the total. In contrast, conventional radiology accounts for 85% of the total number of procedures, but only 13% of the effective dose.

Conclusion: The study has demonstrated that conventional radiography still represents the biggest contributor to examination frequency in Aosta Valley in 2009. However, the frequency of the main procedures did not change significantly between 2002 and 2009.

Figure 1

Analysis by patients' age of the number of conventional radiology examinations performed on (a) females and (b) males between 2002 and 2009 at the Radiological Department of Aosta Hospital.

Figure 2

Frequency of the main examination types performed between 2002 and 2009 at the Radiological Department of Aosta Hospital as a percentage of total procedures.

Figure 3

Trend in the radiological examination frequency per 1000 inhabitants in Aosta Valley between 2002 and 2009 for females (a) and males (b).

Figure 4

Analysis by examination type of the effective per caput dose to females (a) and males (b) between 2002 and 2009 in Aosta Valley.

Figure 5

Collective effective dose and examination frequency of the main radiological examinations performed at the Radiological Department of Aosta Hospital in 2009.