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P C Knight

Publications and source records attributed to P C Knight.

4 recordsLinked to original sources
PubMed1987

An approach to digital signal processing for ultrasonics research.

The increasingly sophisticated techniques for the extraction of information from ultrasonic data entail a corresponding increase in complexity of the software used. An interactive signal and image processing package, called TWODIMSY, has been developed at the Ultrasonics Institute to allow non-programmers an entry to digital signal processing, and to simplify the task of staff involved in programming. We present an outline of the design considerations which shaped TWODIMSY, and a brief history of its ancestors. A detailed description of the package is given, including the type of computational facilities provided and the approach taken to solve the problems of data storage, operator interface and documentation.

Humans↗
PubMed1980

Fetal age and patterns of human fetal breathing movements.

Human fetal breathing movements have been studied serially from 20 weeks to the onset of labor in eight normal primigravid patients. Real-time ultrasound was used and the events of the study period were analyzed visually and by computer processing of a punched paper tape record. Studies were performed before and after a maternal glucose load. The pattern of fetal breathing movements changed with increasing fetal age. The breathing rate decreased and became more regular toward term. The form of each breath altered with gestational age. Prior to 32 weeks the breath time was short. Between 32 and 36 weeks a breath characterized by a long inspiratory phase with multiple augmenting movements was seen. After 36 weeks the breath was more uniform. A definite periodicity was seen in the last 2 weeks of pregnancy, with episodes of shallow, more regular breathing and a more variable pattern. Glucose intake did not alter these patterns.

Fetus↗