Three-dimensional computed tomography from interferometric measurements within a narrow cone of views. 
A theory is presented and tested for recovering a fluid property from measurements of its projections.  Viewing comes as small as 10 degrees are evaluated, and the only assumption is that the property is space limited.  The results of applying the theory to numerical and actual interferograms of a spherical discontinuity of refractive index are presented.  The theory was developed to test the practicality and limits of using three-dimensional computed tomography to process optical diagnostic data for internal fluid dynamics.