[Experimental evaluation of a tomographic system of the thorax by detection of the dispersion of technetium-99m radiation].

Based on a previous theoretical study, a simple device for the acquisition of bidimensional tomographic images of the human chest densitometry was designed. A radioactive linear source (99mTc) was adapted to the lateral aspect of a gamma camera detector in order to register only those photons scattered at 90 degrees. Resulting images from a liver phantom stuffed with saw dust, showed an evident tomographic effect and a satisfactory contrast between the structures sited at less than 20 cm from the source. These effects tend to decrease with distance. The causes of these deficiencies of the system and their possible corrections are discussed.