Biomedical subjects

L Pickenhan

Publications and source records attributed to L Pickenhan.

3 recordsLinked to original sources

PubMed1985

[5MHz realtime sonography of the breast. 2. Examination technic and diagnostic value].

The diagnostic value of mamma-sonography using realtime technique was evaluated in a prospective study based on the experience of 452 pathomorphologically confirmed sonographic results. Large cysts (greater than 1 cm) were correctly classified as 97%, while small cysts (less than or equal to 1 cm) were recognized in 84%. Eighty-six percent of the fibroadenomas were visualized; 50% of these lesions were classified as "benign" and 34% as "equivocal--probably benign". In 70% of the patients with mastopathic alterations, no abnormalities were detected sonographically, except when cystic lesions (greater than 3 mm) were present. Fifty-percent of the in-situ-carcinomas and small carcinomas (less than or equal to 1 cm) were recognized, while 97% of the larger carcinomas (greater than 1 cm) were demonstrated. The frequency of the different echographic criteria was analyzed with regard to the pathohistological results.

Adenofibroma↗

PubMed1983

Sonographic morphology of the breast.

The interpretation of ultrasound mammograms is complicated by the heterogeneous tissue structure of the breast. To improve the diagnostic analysis, a method has been developed which enables us to correlate ultrasound images of mastectomized specimen with the cross-sectional anatomy, the computerized tomography, the X-ray photographs of the specimen and the histopathologic study of the corresponding gross serial sections. Some echophenomena considering the propagation properties of ultrasound are discussed.

Breast↗

PubMed1982

[Comparative studies of various echomammography techniques].

Until now it is not clear which echographic scanning technique is most effective and economic for breast examination. To answer this question we examined in a special study 189 patients with the following scanning units: 1. automated immersion scanning technique, 3 MHz (Octoson, Ausonics) 2. manual compound scanning unit (skin contact), 5 MHz (80 LDI, Picker) 3. linear array realtime scanner (skin contact), 5 MHz (SAL 20, Toshiba). Two examiners evaluated the image quality with regard to the visualisation of the histologically confirmed malignant lesions (n = 78). For testing the spatial resolution, we developed a tissue--mimicking phantom including cyst-like structures of different sizes. The clinical and technical advantages and disadvantages respectively of these three methods are discussed.

Breast Neoplasms↗