Biomedical subjects

A Z Ponce

Publications and source records attributed to A Z Ponce.

9 recordsLinked to original sources

PubMed1988

The use of added erbium filtration in intraoral radiography.

Using D and E speed film, intraoral exposures were made of a phantom at 70 and 90 kVp, with and without erbium filtration. Measurement of surface exposures indicates substantial reduction when erbium filtration was used. However, there was a visible loss of contrast. The raters agreed that radiographs made with E speed and D speed film, both with and without erbium filtration, were all of adequate diagnostic quality. The radiographs with the highest contrast were consistently preferred by all of the raters.

Erbium↗

PubMed1986

Adaptation of the Panorex II for use with rare earth screen-film combinations.

A series of radiographs of a tissue-equivalent phantom was taken in order to arrive at satisfactory radiographic techniques for the use of rare earth screens with the Panorex II. The radiation reduction needed for use of the rare earth screens was made with various filters. There was a 40% to 60% reduction in patient exposure for all of the rare earth exposures. Raters agreed that all films that were ranked were diagnostically acceptable, although differences were noted.

Humans↗

PubMed1986

Kodak T-Mat G film in rotational panoramic radiography.

Panoramic radiographs were taken of a tissue-equivalent phantom to evaluate T-Mat G and Ortho G films in combination with rare earth screens. The radiographs were compared to radiographs made with high-speed calcium tungstate screens and Kodak XRP film. The reduction in the amount of radiation necessary for the use of rare earth screens (50% to 70%) was accomplished by lowering the mA and adding filtration. All evaluated films were diagnostically acceptable. There was a marked preference of the T-Mat radiographs over the Ortho G radiographs and a slight preference over radiographs made with the standard calcium-tungstate screen-film system.

Humans↗

PubMed1986

Use of E-speed film with added filtration.

The use of aluminum, gadolinium, and yttrium filters in conjunction with E-speed film was studied. The resulting radiographs were judged to be acceptable for diagnostic purposes, although clinicians showed a preference for E-speed radiographs made at reduced exposure times and for D-speed radiographs. There was no detectable difference between the radiographs produced with the various filter materials.

Equipment Design↗

PubMed1982