Tissue Density Measurements From Digital Chest Radiographs

Michael L. Cocklin; Peter M. Lams; Robert C. Schroter

doi:10.1117/12.947283

11 June 1985 Tissue Density Measurements From Digital Chest Radiographs

Michael L. Cocklin, Peter M. Lams, Robert C. Schroter

Proceedings Volume 0535, Application of Optical Instrumentation in Medicine XIII; (1985) https://doi.org/10.1117/12.947283
Event: 1985 Medical Imaging Conferences, 1985, California, United States

Abstract

An investigation is made of the possibility of obtaining reliable measurements of tissue density from digital chest radiographs. This involves assessment of the repeatability and uniformity of x-ray exposure using microdensitometry of conventional film and estimation of scattered radiation. The range of variation of film density spatially and over time was found to be within ±0.03 optical density units (O.D.). Scatter fraction measurements using partial absorbers gave results within, on average, 6% of the conventional measurement and was found to be approximately linearly related to mass/unit area. By correcting for film response and scatter, measurement of a variety of densities of foam rubber was found to correlate well with true density, with an average error of 5%. The estimation of regional lung ventilation from inspiration/expiration radiographs is investigated, using spatial warping techniques to facilitate the identification of corresponding areas of the two radiographs.

Citation Download Citation

Michael L. Cocklin, Peter M. Lams, and Robert C. Schroter "Tissue Density Measurements From Digital Chest Radiographs", Proc. SPIE 0535, Application of Optical Instrumentation in Medicine XIII, (11 June 1985); https://doi.org/10.1117/12.947283

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