Table 1. Patient Characteristics.

Thirty-one CT image sets were obtained from eight patients. Patient characteristics include patient specific details including gender, age at treatment, stage, histology, tumor location, use of concurrent chemotherapy, and treatment intent.

No. of patients	8
Male/female	7/1
Age (y), mean (range)	62.3 (38–77)
Pathology, n (%)
Adenocarcinoma	5 (62.5)
Squamous cell carcinoma	3 (37.5)
Stage, n (%)*
II	2 (25)
III	1 (12.5)
IVa	1 (12.5)
IVb	4 (50)
Tumor Location, n (%)†
Mid Esophagus	4 (50)
Distal Esophagus	4 (50)
Concurrent Chemotherapy, n (%)
Yes	6 (75)
No	2 (25)
Treatment intention
Definitive	3 (37.5)
Neo-adjuvant	2 (25)
Palliative	3 (37.5)
No. of CT sets, mean (range) ‡	3.9 (1–5)

^*Staging per AJCC Cancer Staging Manual, Sixth Edition (2002)

^†Mid esophagus, >24 to ≤32 cm from the incisors; distal esophagus, >32 cm from incisors.

^‡Refers to number of simulation, pre-treatment, and post-treatment CT image sets obtained for each patient (the fractions for which pre-treatment and post-treatment CT scans were obtained).