Description
When using the DSPS® for SRS/SRT, the system consists of a “double shell” of two masks made of special thermoplastic materials formulated specifically for use with the cradle. The patented material of the occipital mask is rigid enough to hold the patient’s head during molding, acting as a “second skin” to create a perfect mold of the occipital region.
There is no need for an additional head support and there is full access to customize the mask around the patient’s neck and occipital bones. The facial mask is not overstretched and therefore extremely rigid. Both masks have ultra-low shrinkage, resulting in a comfortable setup for the patient with published immobilization accuracy.
Accuracy of DSPS® Head-only Setup
Interfractional movement / Setup correction
| Lat (mm) | Lng (mm) | Vrt (mm) | Pitch (°) | Rtn (°) | Roll (°) | |
|---|---|---|---|---|---|---|
| μ | 0.1 | -0.2 | 0.4 | 0.3 | 0.0 | -0.3 |
| Σ | 1.1 | 2.0 | 2.1 | 0.5 | 0.6 | 0.3 |
| ∂ | 1.1 | 2.1 | 4.3 | 0.5 | 0.5 | 0.3 |
Intrafractional movement
| Lat (mm) | Lng (mm) | Vrt (mm) | Pitch (°) | Rtn (°) | Roll (°) | |
|---|---|---|---|---|---|---|
| μ | 0.0 | 0.1 | 0.0 | 0.0 | 0.1 | 0.0 |
| Σ | 0.2 | 0.1 | 0.0 | 0.0 | 0.2 | 0.0 |
| ∂ | 0.5 | 0.2 | 0.1 | 0.1 | 0.3 | 0.1 |
μ = mean of means Σ = systematic ∂ = random
Data courtesy of MAASTRO Clinic, University Medical Center, Maastricht, The Netherlands²
