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Biomedical subjects

I Sewerin

Publications and source records attributed to I Sewerin.

At least 55 records · Page 3Linked to original sources
PubMed1984

Gagging in dental radiography.

The frequency of gagging during full-mouth radiography was evaluated in 478 patients. Gagging was observed in 13% of the patients. The frequency of gagging differed significantly in groups radiographed by trained radiographers and by students (9% and 26%, respectively). Gagging occurred in all regions but most frequently in the maxillary molar area. The technical skill, authority, and self-confidence of the operator were major factors of importance in preventing and suppressing gag reflexes in dental radiography.

Adolescent↗
PubMed1983

Three-dimensional perception of radiographic images among dental students and dentists.

Six radiographs exhibiting problems of three-dimensional perception were shown to seventy-six inexperienced dental students and to seventy-six experienced dentists. They were asked (1) from which viewing direction they perceived the image, (2) if they were able to reverse the image, and if not (3) if they denied the possibility of reversibility. In most cases a vast majority (83 to 93 percent) agreed in one perception. Twelve to 62 percent were unable to reverse the images. High percentages of the observers denied perceptions other than their own. No statistically significant differences were observed between the answers of the students and the dentists. The decisions of the observers and their restricted ability for ambiguous perception are discussed. Rules governing the choices of perception are suggested. The importance of training at undergraduate as well as postgraduate levels in perceiving radiographic images ambiguously and three-dimensionally is stressed.

Dentists↗
PubMed1983

Artifacts due to movement in rotational panoramic radiography.

Image quality due to movement of the patient during the exposure is a common problem in conventional radiography. The resulting artifacts in the image are characteristic and easily identifiable blurring. The unique mechanics of image production and the prolonged exposure time used in rotational panoramic radiography can cause very different disturbances in the diagnostic image. The illustrations presented here are extreme examples of such artifacts, selected for clear illustration in a printed image. The challenge to the clinician is to identify the full spectrum of such distortions, from the obvious ones to the much more subtle effects of similar minor distortions that may not be so easily recognized as artifacts.

Head↗