Fatty acids of diapause and nondiapause pink bollworm larvae, Pectinophora Gossypiella (Saunders).
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D R Foster
Publications and source records attributed to D R Foster.
Artifactual echoes in B-mode images due to multiple scattering.
In B-mode images, echoes, which appear to arise from inherently anechoic regions due to scattering from neighbouring echogenic regions, can be considered artifactual. We have observed multiple scatter contributions to such artifactual echoes in images of plane boundaries between random scattering phantoms and anechoic regions. For the strongest scattering phantom studied, multiple scatter echoes were 3-9% of the average phantom signal using two sharply focused transducers, an annular array in pulse echo mode, and an annular array/cone hybrid. Multiple scatter was less than 5% for a conventional transducer. Echo amplitudes were also measured in normal excised human liver and breast tissue. It was estimated that artifactual echoes due to multiple scatter would be negligible in B-mode images of liver. However, for breast imaging, the level of artifactual echoes was estimated to be similar to that found for our strongest scattering phantom.
Breast↗
Self-expandable oesophageal stents in the management of benign peptic oesophageal strictures in the elderly.
Self-expandable oesophageal stents are being increasingly used in the management of malignant oesophageal strictures. Most benign peptic oesophageal strictures can be successfully managed using endoscopic oesophageal dilatation combined with long-term Proton pump inhibition therapy. Although endoscopic oesophageal dilatation can be performed on an outpatient basis, it often requires repeated hospital visits. There is a small risk of oesophageal perforation, while cardio-respiratory complications may be encountered during the use of intravenous sedation in an elderly population. The use of self-expandable Strecker stents in three elderly patients with benign peptic oesophageal strictures is described.
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