Table 1 Statistical analysis of high dose point in the PTV measured with ion-chamber: [(measured dose)-(calculated dose)]/calculated dose, with associated confidence limit
From: Statistical analysis of IMRT dosimetry quality assurance measurements for local delivery guideline
Treatment site | Location | Mean | Standard deviation (σ) | Maximum | Minimum |
|---|---|---|---|---|---|
Prostate | I/C1 or near I/C | -0.004 (-0.4%) | 0.012 (1.2%) | 0.025 (2.5%) | -0.046 (-4.6%) |
Brain | I/C or near I/C | -0.006 (-0.6%) | 0.015 (1.5%) | 0.039 (3.9%) | -0.041 (-4.1%) |
Head and Neck | I/C or near I/C | -0.016 (-1.6%) | 0.012 (1.2%) | 0.027 (2.7%) | -0.046 (-4.6%) |
Overall combined | -0.010 (-1.0%) | 0.015 (1.5%) | 0.039 (3.9%) | -0.046 (-4.6%) | |
Confidence limit = (|mean|+1.96σ) | 0.038 (3.8%) | ||||