Observation and measurement of applied anatomical features for thoracic intervertebral foramen puncture on computed tomography images

Table 1 Occlusion of the transverse process spaces of different segments by the rib head/neck (both sides)

Segment	No occlusion	0 < Occlusion ≤ 1/2	Occlusion > 1/2
T1-2 (n = 12)	12 (100%)	0	0
T2-3 (n = 34)	15 (44.12%)	19 (55.88%)	0
T3-4 (n = 46)	5 (10.87%)	39 (84.78%)	2 (4.35%)
T4-5 (n = 46)	0	37 (80.43%)	9 (19.57%)
T5-6 (n = 28)	0	15 (53.57%)	13 (46.43%)
T6-7 (n = 32)	0	4 (12.50%)	28 (87.50%)
T7-8 (n = 24)	0	5 (20.83%)	19 (79.17%)
T8-9 (n = 32)	0	6 (18.75%)	26 (81.25%)
T9-10 (n = 32)	0	10 (31.25%)	22 (68.75%)
T10-11 (n = 20)	0	16 (80.00%)	4 (20.00%)
T11-12 (n = 16)	2 (12.50%)	14 (87.50%)	0
T12-L1 (n = 12)	12 (100%)	0	0