Table 1.

Plan quality metrics and assigned scores for assessing prostate plan quality.

Structure	Metric	Maximum		Middle range		Minimum
		Score	Criteria	Score	Criteria	Score	Criteria
CTV	% covered by TD	20	100–99.5%	19.9–0.1	99.6–99%	0	<98.9%
PTV	% covered by TD	20	100–95%	19.9–0.1	94.9–90%	0	<89.9%
	% covered by 95%TD	10	100–99%	9.9–0.1	98.9–98	0	<97.9%
	% covered by 107%TD	10	<1%	9.9–0.1	1.1–2%	0	>2%
	% covered by 105%TD	10	0%			0	>15%
	Mean dose	5	81–83 Gy	2.9–0.1	84.6 –85.6 Gy	0	>85.6 Gy
	Homogeneity Index	5	0.02			0	>0.15
	Conformation Number	5	1	4.9–4 3.9–0	0.9–0.7 0.69–0.51	0	<0.5
	Volume (cc) covered by TD outside PTV	10	8–10 cc	7.9–0	10.1–20 cc	0	>20 cc
Rectum	Volume (cc) covered by 102.5%TD	0	<2 cc	0.1 to −5	2–3 cc	−5	>3 cc
	% covered by 40 Gy	10	<35%	8–10 7.9–0.1	35.1–40% 40.1–45%	0	>45%
	% covered by 65 Gy	10	<17%	9.9–0.1	17.1–21%	0	>21%
	% covered by 75 Gy	10	<10%	9.9–0.1	10.1–15%	0	>15%
	Coverage of 50%TD axial slice evaluation	0	Pass			−10	Fail
Bladder	% covered by 60 Gy	5	<35%	4.9–0.1	35.1–40%	0	>40%
	% covered by 40 Gy	5	<50%	4.9–0.1	50.1–60%	0	>60%
Penile bulb	% covered by 50 Gy	2	<95%	1.9–0.1	95.1–100%	0	>100%
Rt femoral head	% covered by 45 Gy	2	<2%	1.9–0.1	2–5%	0	>5%
Lt femoral head	% covered by 45 Gy	2	<2%	1.9–0.1	2–5%	0	>5%
Patient	Volume (cc) covered by 110%TD	0	<2 cc	−0.1 to −5	2–5 cc	−5	>5 cc
Global max location	Within CTV/PTV/elsewhere/rectum	5	CTV	3 0	PTV Elsewhere	−5	Rectum

Abbreviations: CTV, clinical target volume; PTV, planning target volume; TD, total dose (Gy).

Definitions: Homogeneity Index = [Dose covering 1% of PTV − Dose covering 99% of PTV] (Gy)/Prescribed dose (Gy). The prescribed dose was 81 Gy.

Conformation number = [PTV (cc) covered by specified dose (95% in Gy)]²/[Total volume covered by 95% dose (Gy) × Total volume of PTV (cc)].