Terminated due to the inability to enroll and carry out study intervention.

Using the analysis of group velocity for a screening application and then higher order analysis based on the elastic and viscious components of the shear modulus may allow discrimination between extent of tumor invasion through the esophageal wall if appropriately correlated with pathological findings.

Use of ultrasound-based vibrometry in this setting would allow for a relatively simple study and translation of clinical practice, as the same devices are already used in this setting, and operators have familiarity with the equipment. Incorporating another additional method to generate contrast for determining malignant tissue from normal based on biomechanical properties with the same probe would have benefit as an additional diagnostic modality.

Inclusion Criteria:

• ≥ 18 years old
• Scheduled to undergo esophageal reconstruction for presumed or known esophageal cancer
• Subject is able to understand the study procedures and provide informed consent.

Exclusion Criteria:

• Subject is pregnant or breast feeding.