Table 3.

Dose point results in different balloon and air cavity size combinations. The unit is in cGy.

34 cc	Air Cavity Radius
	0.25 cm	0.50 cm	1.00 cm	1.44 cm
Balloon Surface $({\mathrm{D}}_{\text{sur}})$	760.7	761.4	766.6	769.5
Air Cavity Surface ${(\mathrm{D}}_{\text{sur}-\text{ac}})$	603.3	492.6	346.5	266.1
PTV Point $({\mathrm{D}}_{\text{PTV}})$	336.2	337.4	337.4	337.9
Air Cavity PTV Point ${(\mathrm{D}}_{\text{PVT}-\text{ac}})$	286.8	251.7	196.6	163.2
70 cc (S)	Air Cavity Radius
	0.50 cm	1.00 cm	1.50 cm	1.66 cm
Balloon Surface $({\mathrm{D}}_{\text{sur}})$	670.0	670.1	671.3	669.3
Air Cavity Surface ${(\mathrm{D}}_{\text{sur}-\text{ac}})$	475.3	354.6	274.7	256.7
PTV Point $({\mathrm{D}}_{\text{PTV}})$	340.3	340.8	341.5	340.2
Air Cavity PTV Point ${(\mathrm{D}}_{\text{PVT}-\text{ac}})$	267.2	217.3	179.9	169.0
70 cc (L)	Air Cavity Radius
	0.50 cm	1.00 cm	1.50 cm	1.62 cm
Balloon Surface $({\mathrm{D}}_{\text{sur}})$	679.4	681.7	681.5	675.8
Air Cavity Surface ${(\mathrm{D}}_{\text{sur}-\text{ac}})$	470.2	347.4	267.1	255.0
PTV Point $({\mathrm{D}}_{\text{PTV}})$	345.4	341.1	337.2	334.9
Air Cavity PTV Point ${(\mathrm{D}}_{\text{PVT}-\text{ac}})$	262.5	209.3	173.1	165.6
125 cc	Air Cavity Radius
	0.50 cm	1.00 cm	1.50 cm	2.0 cm
Balloon Surface $({\mathrm{D}}_{\text{sur}})$	614.8	616.3	615.5	641.5
Air Cavity Surface ${(\mathrm{D}}_{\text{sur}-\text{ac}})$	454.0	351.4	281.0	230.5
PTV Point $({\mathrm{D}}_{\text{PTV}})$	339.4	340.2	340.4	338.1
Air Cavity PTV Point ${(\mathrm{D}}_{\text{PVT}-\text{ac}})$	271.9	225.0	189.6	161.2