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Biomedical subjects

W W Logan

Publications and source records attributed to W W Logan.

5 recordsLinked to original sources
PubMed1979

Increased incidence of breast carcinoma in patients with irradiation for post-partum mastitis: a screening situation.

In Rochester, New York, 606 women were treated with ionizing radiation for post-partum mastitis, mostly between 1940 and 1955. Two-thirds of all breasts were treated, the average dose per breast being 377 rads (at 2.5 cm breast depth). Mammographic examinations were performed on 265 of these women still residing in this vicinity. Two nonpalpable carcinomas (with no axillary node metastases) were found in the twelve breast lesions that have been biopsied. Some of the biopsies revealed premalignant changes. It is recommended that women in this high-risk category have close medical supervision, as well as periodic mammographic evaluation, and that the importance of periodic breast self-examinations should be emphasized.

Adult↗
PubMed1979

Focal spot size and scatter suppression in magnification mammography.

The improved image quality using magnification in film-screen mammography is related to a complicated interplay between focal spot size, x-ray tube output, detector resolution and sensitivity, air gap size, and target dimensions. Preliminary clinical evaluation of magnification mammography indicates that accuracy of diagnosis has been considerably enhanced. Additional technical and clinical evaluations are continuing, as suggested by mathematical modeling, in order to determine the best possible magnification protocols. While a small focal spot (less than 300 micrometers) is highly recommended for both contact and magnification with the film-screen systems, the smallest focal spot sizes (150 micrometers and smaller) may neither be necessary nor the best in all situations of reduced dose magnification mammography.

Female↗
PubMed1976

Improved liquid cholesterol ester crystal thermography of the breast.

The infrated detection apparatus used in breast thermography is relatively costly and therefore is not widely available to less populated areas in the country. The use of liquid cholesterol crystals, applied to the breast (applied over a water-base black dye) has already been described in the literature as an effective substitute for infrared instrument thermography. This method, however, has been hampered by the time and troublesome effort necessary for removal of the substances upon completion of the study. The object of this study was to devise a feasible method of cutaneous breast thermography using liquid cholesterol esters, as in prior studies, but by applying them to an easily removable black base. As a result the length of the examination has been shortened, and patients have found the examination to be aesthetically more acceptable. With this improved method, liquid crystal thermography of the breast (and other areas) should become more widely applicable.

Adult↗