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La translocation chromosomique 1-29 a été mise en évidence dans 10,2 p. 100 d’un échantillon de 305 têtes de bétail Nguni. L’étude de la diffusion de cette translocation montre un mode de transmission héréditaire mais ne donne aucune indication sur son origine. Cette fréquence élevée a été atteinte en dépit d’une chute corrélative de la fertilité et de(More)
Following the discovery of the 1/29 chromosome translocation in Swedish artificial insemination (AI) bulls, cytogenetic evaluation of South African AI bulls was initiated. The present paper reports on the 269 bulls screened over the past 11 yr. The 1/29 chromosome translocation was found in Brahman and Brown Swiss bulls while chimerism was present in the(More)
PURPOSE This study investigates the use of a mechanically swept 3D ultrasound (US) probe to estimate intra-fraction motion of the prostate during radiation therapy using an US phantom and simulated transperineal imaging. METHODS A 3D motion platform was used to translate an US speckle phantom while simulating transperineal US imaging. Motion patterns for(More)
PURPOSE There is substantial observer variability in the delineation of target volumes for post-surgical partial breast radiotherapy because the tumour bed has poor x-ray contrast. This variability may result in substantial variations in planned dose distribution. Ultrasound elastography (USE) has an ability to detect mechanical discontinuities and(More)
A 1/29 chromosome translocation was found in a Brahman bull in artificial insemination service. In the subsequent investigation, it was established that most of the semen produced had been sold to commercial breeders. An extended pedigree showed that the translocation was introduced into South Africa by cattle imported from the USA. The anomaly was absent(More)
PURPOSE In breast radiotherapy, the target volume may change during treatment and need adaptation of the treatment plan. This is possible for both tumour bed (TB) and whole breast (WB) target volumes. Delineation of the target (to detect changes) is also subject to uncertainty due to intra- and inter-observer variability. This work measured the uncertainty,(More)
Realistic modelling of breast deformation requires the breast tissue to be segmented into fibroglandular and fatty tissue and assigned suitable material properties. There are a number of breast tissue segmentation methods proposed and used in the literature. The purpose of this study was to validate and compare the accuracy of various segmentation methods(More)
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