Absolute Absorption and Reflectance Constants of Ocular Tissue

Abstract

The constants for acoustic absorption for a series of patients with malignant melanoma, metastatic carcinoma, choroidal hemangioma, and organized sub-retinal hemorrhage have been determined through the use of power spectrum analysis. These values, combined with conventional A- and B-scan display dynamics have provided a distinction among these tumor types.

Improved display detail allows us to deduce the sources of internal tumor reflections far more reliably than previously possible. For example, the vascular channel dimensions of a tumor can be determined and quantified. The absorption components can be determined for specific and sequential areas of the tumor, as well as the averaged absorption constants for total tumor volume.

The quantifiable values obtained by this computer analysis technique provides an improved dimension of confidence to tumor diagnosis.