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Biomedical subjects

M I Tombak

Publications and source records attributed to M I Tombak.

At least 19 recordsLinked to original sources
PubMedDate not supplied

[To the 60th anniversary of foundation of the Laboratory of X-ray Receivers, Russian Scientific Center for Roentgenoradiology. Part I: From birth to recognition].

The evolution of X-ray phosphors, screens, and films from the 1940s to present day and the contribution of the Laboratory of X-Ray Receivers, Russian Scientific Center for Roentgenoradiology, to this process are considered. It is shown that this evolution was mainly due to the attempts to obtain maximal diagnostic information with minimal dose load on patients and medical personnel. As a result, a family of intensifying screens was developed on the basis of traditional calcium-tungstate and zinc-cadmium-sulfide phosphors, as well as new phosphors based on rare-earth oxysulfides, oxyhalides, and tantalites and barium fluorohalides. The classification, properties and fields of application of the screens of all types are described. The permissible limits of the main X-ray film characteristics and the parameters of their processing are discussed from the same point of view. The research into this area will be apparently combined with further development of digital radiography and its introduction into medical practice.

History, 20th Century↗
PubMedDate not supplied

[To the 60th anniversary of Foundation of the Laboratory of X-ray Receivers, Russian Scientific Center for Roentgenoradiology. Part I: Records of the past, current research - a base for the future ].

The evolution of X-ray phosphors, screens, and films from the 1940s to present day and the contribution of the Laboratory of X-Ray Receivers, Russian Scientific Center for Roentgenoradiology, to this process are considered. It is shown that this evolution was mainly due to the attempts to obtain maximal diagnostic information with minimal dose load on patients and medical personnel. As a result, a family of intensifying screens was developed on the basis of traditional calcium-tungstate and zinc-cadmium-sulfide phosphors, as well as new phosphors based on rare-earth oxysulfides, oxyhalides, and tantalites and barium fluorohalides. The classification, properties and fields of application of the screens of all types are described. The permissible limits of the main X-ray film characteristics and the parameters of their processing are discussed from the same point of view. The research into this area will be apparently combined with further development of digital radiography and its introduction into medical practice.

Equipment Design↗
PubMedDate not supplied

[Standardization of the study of maxillofacial roentgenology. II. Standardization of the methodology of orthopantomography].

The main factor of a good quality of orthopantomograms is a correct position of the occlusion plane and chin support, the straightening of the cervical vertebrae, head fixation and a choice of physicochemical conditions for exposure. All these conditions ensure the standardization of orthopantomography, reducing to the minimum errors in investigations.

Humans↗
PubMedDate not supplied

[Standardization of examinations in maxillofacial roentgenology. I. Standardization of methods in intraoral roentgenography].

Typical errors in teeth roentgenography reproduced in experiment, indicate that considerable disproportional distortions of images of anatomical structures which are decisive for radiodiagnosis, may occur in these cases. These distortions influence the accuracy of assessment of the condition of periapical tissues, marginal parts of the alveolar process, cavity sizes, and the actual end of the root of the canal. Standardization of intraoral roentgenography is based on a strict position of the patient's head, angle of inclination and alignment of a tube. Specialized P3-1 film should be used. Its processing should strictly correspond to the instructions of a manufacturing factory otherwise the quality of an image is deteriorated and an effective equivalent dose on the vital organs is increased.

Humans↗