[Accuracy of reproducing images of objects in electro-roentgenographic examination of various organs]. / O tochnosti vosproizvedeniia ob'ektov pri elektrorentgenograficheskom issledovanii nekotorykh organov

Most characteristic distortions of electroroentgenographic and electroroentgenotomographic images obtained with the help of Soviet-made (see article) and (see article) units are reviewed. Images of different nature (positive, negative) are compared. Qualitative and quantitative assessment of distortions is give. An electroentgenographic image is contrasted against an analogous image on a PM-1 film. The dependance of the object's structure discernability on its localization on the electrooentgenographic layer is investigated.

[Characteristics of manifestations of border effect in electroroentgenobronchography]. / Osobennosti proiavleniia kraevogo effekta pri elektrorentgenobronkhografii

Specificity of the image reflecting the outlines of the bronchial lumena on the electroroentgenograms is explained by the manifestation of the border effect. The latter is caused by the non-uniformity of the electric field over the surface of the selenium layer with a regular distribution of charges. With electroroentgenography of sharply contrasted objects in a little contrast medium the potential relief has highly pronounced differences, this leading to distorsion of the dimensions and the shape of the objects under examination. When interpreting electroroentgenograms these specific features should be taken into consideration. In constructing improved medical radiographic equipment it will be advisable to envisage the possibility of controlling the said effect.