title: [Tomographic densitometry of the human thorax].
abstract: We show the first clinical images obtained by a new tomographic system based on the detection of the scattered gamma photons of 99mTc by the chest tissues. These images show satisfactory contrast and tomographic effect on the half-chest near the radioactive source. Both effects tend to decrease on the contralateral half-chest. The images rendered important data in differential diagnosis of perfusion defects evident by lung scintigraphy with macroaggregated albumin labeled with 99mTc. Pulmonary density was normal and homogeneous in a healthy volunteer and also in a patient with pulmonary embolism. It demonstrated a hyperdense pulmonary mass in a patient with tumor of the right lung, which produced a perfusion defect evident in the conventional lung scintiscan, and a shadow in the gamma ray transmission image.
mesh_terms: D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008175:Lung Neoplasms / Q000000981:diagnostic imaging; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging; D013667:Technetium; D013668:Technetium Tc 99m Aggregated Albumin; D013909:Thorax / Q000000981:diagnostic imaging*; D014055:Tomography, Emission-Computed / Q000295:instrumentation / Q000379:methods*
chemical_list: D013668:Technetium Tc 99m Aggregated Albumin; D013667:Technetium
vernacular_title: Densitometría tomográfica del tórax humano.