Does Vertebroplasty Affect Radiation Dose Distribution?: Comparison of Spatial Dose Distributions in a Cement-Injected Vertebra as Calculated by Treatment Planning System and Actual Spatial Dose Distribution
Figure 3
The calculated dose distribution maps using RTPS and the dose distribution maps measured by film dosimetry. (a) with the phantom without bone cement, the calculated dose distribution was undistorted. (b) with the phantom with bone cement, using RTPS with clinical setting, a depression in the isodose curve was seen for areas corresponding to inside the cement and the ventral side of the cement. (c) with the phantom with bone cement, using RTPS with importing the bulk density of the bone cement, dose inside the cement was the same as in the surrounding area. A depression in the isodose curve was seen in the ventral side of the cement however, the distortion with importing the bulk density of the bone cement (c) was less than with clinical setting (b). (d) with the phantom without bone cement, no distortion and no difference in the isodose curve were seen between calculated dose distribution (a) and measured dose distribution (d). (e) with the phantom with bone cement, a dose distribution map drawn by the film-based dose distribution analysis system. Dose increases were seen within and around bone cement. No significant dose decrease was seen behind bone cement.
