Table 3.

HU consistency for HyperSight CBCT. The top table is for 125 kV CBCT, and the bottom table is for 140 kV CBCT

125 kV		Catphan position
Material	Catphan HU	Center	10 cm superior	10 cm inferior	10 cm up	10 cm down	10 cm left	10 cm right	Max diff.
Air	−1046:−986	−1000	−1000	−994	−1000	−1000	−1000	−985	6
PMP	−220: −172	−197	−190	−192	−188	−191	−190	−176	21
LDPE	−121:−87	−105	−99	−112	−92	−92	−111	−93	20
Polystyrene	−65:−29	−50	−47	−54	−56	−44	−48	−33	23
Acrylic	92:137	109	108	102	109	112	121	109	19
Delrin	344:387	335	340	326	349	329	338	334	23
Bone 50%	667:783	663	671	635	625	643	674	576	98
Bone 20%	211:263	215	227	206	221	197	204	217	30
Teflon	941:1060	939	939	914	916	934	932	933	25

140 kV		Catphan position
Material	Catphan HU	Center	10 cm superior	10 cm inferior	10 cm up	10 cm down	10 cm left	10 cm right	Max diff.
Air	−1046:−986	−999	−1000	−999	−1000	−1000	−1000	−986	14
PMP	−220: −172	−188	−187	−191	−179	−189	−192	−174	18
LDPE	−121:−87	−96	−94	−107	−84	−93	−107	−88	23
Polystyrene	−65:−29	−44	−45	−52	−51	−43	−46	−35	17
Acrylic	92:137	118	113	102	111	110	115	114	16
Delrin	344:387	346	344	331	358	338	340	338	27
Bone 50%	667:783	644	646	614	598	621	648	558	90
Bone 20%	211:263	214	216	196	216	189	187	205	29
Teflon	941:1060	940	938	911	930	938	930	926	29

Abbreviations: CT = computed tomography; CBCT = cone-beam computed tomography; HU = Hounsfield unit.