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Biomedical subjects

M J Dadd

Publications and source records attributed to M J Dadd.

12 recordsLinked to original sources

Students' learning of clinical sonography: use of computer-assisted instruction and practical class.

RATIONALE AND OBJECTIVES: The application of information technology to teaching radiology will profoundly change the way learning is mediated to students. In this project, the integration of veterinary medical students' knowledge of sonography was promoted by a computer-assisted instruction program and a subsequent practical class. METHODS: The computer-assisted instruction program emphasized the physical principles of clinical sonography and contained simulations and user-active experiments. In the practical class, the students used an actual sonographic machine for the first time and made images of a tissue-equivalent phantom. Students' responses to questionnaires were analyzed. RESULTS: On completing the overall project, 96% of the students said that they now understood sonographic concepts very or reasonably well, and 98% had become very or moderately interested in clinical sonography. CONCLUSIONS: The teaching and learning initiatives enhanced an integrated approach to learning, stimulated student interest and curiosity, improved understanding of sonographic principles, and contributed to an increased confidence and skill in using sonographic equipment.

Attitude

Automatic vessel tracking and measurement for Doppler studies.

In this initial report, an imaging technique is described for automatically recognising the walls of a blood vessel during Doppler measurements, and hence automatically adjusting the position of the sample volume. The method reduces the inherently two-dimensional edge detection problem to a one-dimensional one, and iterates over several imaging frames to optimise the information. The orientation and diameter of the vessel are also measured. The technique has been clinically tested off-line and is particularly applicable to Doppler volumetric flow studies.

Algorithms

Cross sectional visualization of the normal heart by the UI Octoson.

The UI Octoson can provide accurate compound and simple scan cross sectional views of the heart. Sections taken in the transverse, sagittal, and other planes normal and parallel to the long axis of the heart are useful for providing full information that may be obtained by the examination. The views allow the visualization and measurement of most major structures of the heart, giving a more complete description of the geometry of the heart.

Echocardiography