Table 2. Two percent of GTV from 1 to 15 cc and the corresponding sphere diameter.
*The dose prescription to the GTV D98% results in less than 2% of the GTV being below the prescribed dose. GTV D2% and above irradiate a volume equivalent to 2% of GTV
**The diameter (to the first decimal place) of a sphere corresponding to the 2% volume of GTV
GTV: gross tumor volume; DX%: a minimum dose covering at least X% of a target volume
| GTV (cc) | 1.00 | 2.50 | 5.00 | 7.50 | 10.00 | 12.50 | 15.00 |
| 2% of GTV (cc)* | 0.02 | 0.05 | 0.10 | 0.15 | 0.20 | 0.25 | 0.30 |
| Diameter (mm)** | 3.4 | 4.6 | 5.8 | 6.6 | 7.3 | 7.8 | 8.3 |