Table 1. Patient and treatment imaging parameters that influence image quality.

Patient	No. of fractions acquired (of 40)	Stage	Prostate PTV vol (cm3)	Nodal PTV vol (cm3)	Jaw field size (cm × cm)*	Patient lateral width (cm)†	Patient vertical thickness (cm)†	Imaging frequency (Hz)
1	26	T3B	134	507	13.9 × 18.0	35.9	21.1	10
2	23	T1C	117	356	13.9 × 16.2	38.0	22.0	10
3	29	T3A	159	246	14.0 × 14.0	34.2	19.9	5
4	25	T1C	248	0	12.0 × 10.1	41.2	26.7	10
5	24	T1C	327	0	14.0 × 12.7	33.8	19.5	5
6	30	T2A	170	0	12.8 × 10.6	36.5	21.8	10
7	25	T2B	108	590	14.0 × 16.8	37.9	22.9	10
8	30	T1C	218	0	11.1 × 10.6	36.0	21.4	10
9	28	T1C	138	0	10.3 × 10.0	34.5	23.1	5
10	28	T3A	126	333	14.0 × 16.1	33.5	20.4	5

All images were acquired with 125 kVp, 80 mA, 13 ms with the detector at 180 cm from the source.

^*Averaged over 2 treatment arcs.

^†As measured in the isocenter axial plane.