Normalized organ dose data measured as a function of field size for abdominal examinations

Doses to 14 radiosensitive organs were measured as a function of field size for both antero-posterior (AP) and postero-anterior (PA) projections of the abdomen. The organ doses were measured using thermoluminescent dosemeters (TLD) placed within a Rando anthropomorphic phantom. Organ doses were also measured for the conventional 35 x 35 cm film/screen technique, for both AP and PA views. The dose measurements were made at a tube potential of 81 kV, which is commonly used in radiological examinations of the abdomen. TLD were also used to measure the entrance surface dose (with backscatter) for each field size and projection. Organ doses are presented normalized to this entrance surface dose. A brief comparison is made between the data measured in the current study and normalized organ dose data published by other authors. (author)