Comparison of carina-based versus bony anatomy-based registration for setup verification in esophageal cancer radiotherapy

Table 1 Patient, tumor and marker characteristics

Patient	Age (yr)	Sex	Tumor length (cm)	TNM	Histology	Tumor location	Marker type	No. of CBCTs	No. of markers
									At placement	Visible in pCT	Visible in CBCTs
1	56	M	5	T3N1M0	AD	distal	SM	7	2	1	1
2	79	M	8	T3N1M0	AD	distal	SM	7	3	2	1
3	62	M	8	T3N1M0	AD	distal	VM	7	3	3	1
4	61	M	4	T3N1M0	PDC	distal	SM	7	3	3	3 → 2
5^a	73	M	3	T2N1M0	SCC	distal	HG	8^a	0	0	0^a
6	57	V	3	T2N0M0	SCC	distal	SM	8	4	4	4
7	63	M	2	T3N2M0	AD	distal	SM	8	4	4	4
8^a	83	M	8	T2N2M0	AD	distal	VM	28^a	5	5	0^a
9	65	V	4	T2N0M0	SCC	mid	VM	8	4	3	3
10^a	57	M	5	T2N0M0	AD	distal	VM	7^a	3	2	0^a
11	64	M	5	T3N2M0	SCC	distal	SM	12	3	2	2
12	70	M	13	T2N1M0	SCC	proximal	SM	8	3	3	3
13	67	V	5	T3N2M0	SCC	mid	VM	23	4	4	4
14	73	M	4	T2N0M0	SCC	proximal	VM	25	3	3	1
15^a	71	M	6	T4aN2M0	SCC	distal	HG	8^a	6	5	0^a
16	84	M	5	T3N1M0	AD	distal	HG	8	3	3	3 → 1
17	61	M	7	T3N1M0	AD	distal	VM	8	3	3	3
18^a	69	M	7	T3N1M0	AD	distal	HG	23^a	3	3	0^a
19	45	M	6	T2N1M0	AD	distal	SM	7	3	3	3 → 2
20	63	M	3	T2N0M0	AD	distal	SM	11	3	2	2
21	79	V	6	T3N2M0	AD	distal	VM	8	4	4	3
22	59	V	10	T3N2M0	AD	distal	VM	9	4	4	4
23	61	M	6	T3N2M0	AD	distal	VM	12	3	3	3
24	69	M	5	T3N0M0	AD	distal	VM	12	4	4	2
25	69	M	8	T2N1MO	AD	distal	VM	8	4	4	4
26^a	76	M	3	T2N1M0	SCC	distal	HG	8^a	3	2	0^a
27	67	V	4.5	T1N0M0	SCC	proximal	SM	8	3	3	3
28	65	M	4	T3N2M0	SCC	mid	VM	9	5	4	4
29	75	M	5	T3N1M0	SCC	distal	VM	9	3	2	2
30	51	M	17	T3N2M0	AD	prox-mid-dist	SM	7	3	3	2
Total								318 → 236	101	91	65 → 61

Patient numbering is consistent with that in Jin et al. [4]
Abbreviations: AD adenocarcinoma, SCC squamous cell carcinoma, PDC poorly differentiated carcinoma, SM solid, rigid golden marker, VM Visicoil marker, HG radiopaque hydrogel, pCT planning computed tomography, CBCT cone-beam computed tomography
^aMarker not visible on CBCT, subsequent exclusion of patient from data analysis

ISSN: 1748-717X