Real‐time quasi‐three‐dimensional viewing in sonography, with conventional, gray‐scale volume imaging

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Abstract
Real‐time three‐dimensional views of the fetus can be obtained with minor modification to conventional scanners. The modification consists of placing a divergent lens in the out‐of‐scan plane of the transducer to generate a beam fan‐beam in the insonated volume. All of the echoes from which insonates a volume rather than a slice of tissue. Scanning is performed using oblique angles of incidence to provide total reflection conditions. Echoes are then received only from anterior surfaces, automatically generating the three‐dimensional views. Intriguing portrayal of fetal detail can be obtained with this form of imaging which is likely to expand the clinical utility of sonographic examinations. Copyright © 1994 International Society of Ultrasound in Obstetrics and Gynecology

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