[Evaluation of the Distribution of Spatial Scattered Radiation Dose in Bedside Dynamic Chest Radiography].

PURPOSE: The purpose of this study was to determine the distribution of spatial scattered radiation during mobile dynamic chest radiography and to develop protective measures.

METHODS

We measured the spatial scattered radiation, assuming both mobile chest radiography and mobile dynamic chest radiography. We placed the chest phantom on a stretcher. Gatch-up angles were varied from 75°(seated position), 35°(semi-seated position), and 0°(supine position). We measured spatial scattered radiation using the ionization chamber survey meter. The height of the measurement points was 100 cm and 150 cm, assuming the position of the abdomen and lens. We also measured spatial scattered radiation using the radiation shielding screen.

RESULTS

Spatial scattered radiation dose in mobile dynamic chest radiography was approximately five to six times higher than in mobile chest radiography. In the seated position, the spatial scattered radiation dose was about 1.5 times higher on the caudal side of the phantom compared to the cranial side. Behind the radiation shielding screen, the spatial scattered radiation dose decreased significantly.

CONCLUSION

If the examination is performed in a seated position, the radiological technologist can reduce exposure by moving to the patient's head side. Radiation shielding screens are very effective in reducing radiation exposure in mobile dynamic chest radiography.