Abstract
A New Stomach Radiography Guideline (revised edition 2011) recommends population-based screening (Standard radiography I) and opportunistic screening (Standard radiography II) for gastric cancer screening using X-ray. This study evaluated the effective dose in both radiography methods. The study subjects were 240 persons (120 males, 120 females) selected at random from 40,456 medical examinees of the gastric cancer screenings held at the Osaka Center for Cancer and Cardiovascular Disease Prevention. The radiation dose was investigated as the dose-area product (DAP, cGycm2) in all 240 subjects, and the sum of both constituted the total DAP and entrance surface dose (ESD). Every DAP was converted to the effective dose by the software of PCXMC dose calculations. The effective dose and ESD in population-based screening (Standard radiography I) were 4.41 mSv and 33.97 mGy. The effective dose and ESD in opportunistic screening (Standard radiography II) were 5.15 mSv and 46.92 mGy. The comparisons on gender of screenees and on experienced years of radiographers showed that the effective dose was larger on the male and on the experienced less than 5 years in both Standard radiography I and II (P < 0.05). Positive correlations were found between the BMI of screenees and the effective dose in both Standard radiography I (r = 0.500, P < 0.05) and Standard radiography II (r = 0.584, P < 0.05). This study has clarified the effective dose of Standard radiography I and II for the first time in Japan.
