Table 3. Dosimetric comparison of Accuray CyberKnife, Varian TrueBeam with ITV and gating approach, TrueBeam, Elekta no margin plans, Varian Edge with ITV, gating, and no margin plans – most desirable values are in bold. Dose maximum was reported as D0.001 ccm.

CyberKnife: Accuray Incorporated, Sunnyvale, California, United States; Elekta: Elekta, Stockholm, Sweden; Varian: Varian Medical Systems, Palo Alto, California, USA ITV: internal target volume; PTV: planning target volume; CTV: clinical target volume; CT: computed tomography; MLC: multi-leaf collimator; RCA: right coronary artery; CA: coronary artery; LAD: Left anterior descending

Anatomical Structure	Accuray CyberKnife w/ cones	Accuray CyberKnife w/ MLC	Varian TrueBeam (ITV)	Varian TrueBeam (Gated)	Varian TrueBeam (No expansion)	Elekta Infinity (No expansion)	Varian Edge (ITV)	Varian Edge (Gated)	Varian Edge (No expansion)
PTV mean (Gy)	28.31	27.18	30.41	30.26	28.85	27.85	28.17	27.84	27.22
RCA max (Gy)	12.24	2.98	7.15	7.27	6.11	8.91	9.61	9.37	8.03
Ramus CA max (Gy)	21.32	28.12	25.56	24.59	22.10	21.76	24.88	24.22	20.23
LAD CA max (Gy)	21.23	21.88	24.86	23.71	22.09	20.93	24.08	22.76	18.95
L Main CA max (Gy)	14.63	13.61	22.78	21.65	19.57	18.11	14.79	13.86	11.77
Circ max (Gy)	21.35	23.18	24.18	23.11	21.07	21.06	24.26	23.08	20.36
Mitral Valve max (Gy)	19.26	22.18	29.62	28.39	25.46	24.07	25.86	25.11	21.62
Pericardium max (Gy)	31.25	28.74	34.71	34.15	32.05	30.71	32.36	31.90	31.21
Full myocar CTV mean (Gy)	31.25	27.36	31.32	31.15	32.05	30.71	29.09	28.59	27.71
Esophagus max (Gy)	5.21	4.14	10.48	9.62	8.02	10.89	4.47	4.16	3.53
Left bronchus max (Gy)	11.21	12.69	19.40	18.17	15.44	16.54	13.64	12.42	10.80
Heart max (Gy)	31.25	28.74	34.71	34.15	32.04	30.71	32.36	31.90	31.21
Heart mean (Gy)	6.61	5.25	9.08	8.14	6.58	6.01	5.77	5.20	4.07
Total Lung mean (Gy)	1.62	1.45	2.51	2.16	1.79	1.62	1.69	1.53	1.19
Cord max (Gy)	2.50	2.10	5.91	6.50	4.91	7.59	2.40	2.12	1.96
Defib max (Gy)	1.05	0.09	0.51	0.43	0.36	0.48	0.30	0.27	0.21