Table 2.

Mean and standard deviation (SD) for rectal volumes for the n = 30 patients at initial planning CT-scan, and then weekly during treatment.

	Initial planning CT-scan	CBCT 1	CBCT 2	CBCT 3	CBCT 4	CBCT 5	CBCT 6	CBCT 7	CBCT 8
Mean (cm3)	114.6	119.2	94.9	91.6	85.1	99.1	90.2	91.3	82.8
SD	55.3	56.6	38.2	27.5	37.2	53.0	37.7	44.8	22.5