The mean age at treatment was 6 months and the median breast dose was 0.05 Gy (range 0 35.8 Gy).
The mean estimated cumulative breast dose from fluoroscopy, radiography, mammography, and computed tomography combined was 0.0140 Gy and ranged from 0.0005 to 0.6130 Gy (interquartile range 0.0020-0.0174 Gy).
As expected the average 3D breast dose exceeds the average 2D dose (Ratio = 1.28).
Average absorbed breast dose.
An equation has been developed for calculating the average absorbed breast dose (2ABD).
A new dosimetric quantity (average absorbed breast dose [2ABD]) is presented.
The mean percentage of the breast dose on the surgical clip was 90%% (SD 26, range 7 132, median 99%%).
The mean percentage of the breast dose at the SPECT hotspot and the surgical clip was 89 % (SD 17, range 48 105) and 88%% (SD 20, range 37 104), respectively.
Of the 42 included patients, the mean percentage of the breast dose on the SLN site was 90%% (standard deviation 26, range 7 132, median 99), with a non-significant difference between the two techniques (surgical clip or SPECT/CT) (p = 0.608).
The recommended methodologies for breast dose estimation vary (Table 6).
A36 Breast Dose from lactation following I131 treatment.
