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In vivo absorbed dose measurements in mammography using a new real-time luminescence technique

¹ Radiation Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark, ² Department of Medical Radiation Physics, Lund University, Malmö University Hospital, SE 205 02 Malmö, Sweden and ³ Department of Diagnostic Radiology, Lund University, Malmö University Hospital, SE 205 02 Malmö, Sweden

View larger version (12K): [in a new window]   Figure 1. Schematic representation of radioluminescence (RL) and optically stimulated luminescence (OSL) signals from a typical exposure (the absorbed dose is approximately 10 mGy). The exposure starts at time zero and the RL is collected during the exposure. The OSL is shown collected during a time which starts approximately 20 s after the end of the exposures.

View larger version (25K): [in a new window]   Figure 2. Schematic diagram of the radioluminescence/optically stimulated luminescence (RL/OSL) dosimetry system.

View larger version (10K): [in a new window]   Figure 3. Linearity of dose–response at 29 kV (R-squared >0.999). Data are normalized to their value at a 250 mAs exposure, corresponding to an air kerma of 30 mGy (radioluminescence (RL): crosses, optically stimulated luminescence (OSL): circles).

View larger version (11K): [in a new window]   Figure 4. Energy dependence of the luminescence signals compared with the ionization chamber (radioluminescence (RL): crosses, optically stimulated luminescence (OSL): circles). RL and OSL readings are divided by the simultaneous ionization chamber readings. Data are normalized to read unity at 29 kV.

View larger version (11K): [in a new window]   Figure 5. Measurements with one probe (fibre #49) at the entrance surface, the other (fibre #48) at the exit surface of a polymethylmethacrylate (PMMA) phantom. (radioluminescence (RL) exit)/(RL entrance) signals are presented for 23 kV (diamonds), 29 kV (triangles) and 35 kV (circles).

View larger version (79K): [in a new window]   Figure 6. Impact of the radioluminescence/optically stimulated luminescence (RL/OSL) fibres on a mediolateral oblique (MLO) mammogram. Lead markers 60 mm from the chest wall side of the breast support are indicated by arrows.