Table 3.

3DCRT benchmark plans

Region of interest	DV criterion12	Failure mode	n	%*
Ipsilateral lung	Any	Variation acceptable	21	70.0
Surgical cavity boost PTV	Any	Variation acceptable	10	33.3
Breast PTV eval	Max point dose	Variation acceptable	9	30.0
Contralateral breast	Max point dose	Variation acceptable	9	30.0
Whole breast PTV	Any	Variation acceptable	7	23.3
Whole breast boost PTV	Any	Variation acceptable	6	20.0
Heart dose constraint 1	V20 Gy %	Variation acceptable	3	10.0
Heart dose constraint 3	Mean dose	Variation acceptable	2	6.7
Thyroid (missing, n = 17)†	Max point dose	Variation acceptable	2	15.4
Ipsilateral lung dose constraint 1	V20 Gy %	Variation acceptable	1	3.3
Surgical cavity boost PTV	Max point dose	Variation acceptable	1	3.3
Contralateral breast	Max point dose	Deviation unacceptable	8	26.7
Breast PTV eval	Max point dose	Deviation unacceptable	3	10.0
Surgical cavity boost PTV	Any	Deviation unacceptable	3	10.0
Whole breast PTV	Any	Deviation unacceptable	2	6.7
Whole breast boost PTV	Any	Deviation unacceptable	2	6.7
Ipsilateral lung	Any	Deviation unacceptable	2	6.7
Heart dose constraint 1	V20 Gy %	Deviation unacceptable	1	3.3

Abbreviations: 3DCRT = 3-dimensional conformal radiation therapy; DV = dose volume; IMRT = intensity-modulated radiation therapy; PTV = planning target volume; SIB = simultaneous integrated boost.

Targets with dose volume variations or deviations at initial review, for institutions whose benchmark plan required one resubmission (n = 30). Note that a benchmark case requiring resubmission can exhibit acceptable variations (2 or more) and unacceptable deviations.

^*Denominator is 30 unless there are missing regions of interest, in which case denominator = 30 – missing.

^†Added at second protocol amendment.