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His probe consisted of 10 small transducers mounted on an arc-shaped appartus to fit over the eye. Jean Perilhou and her group in France, working under the auspices of the Philips® Company, described a multi-element scanning array in 1967, although they do not produce images in a real-time fashion.The real-time array concept was further expanded by Nicolaas Bom at the Thoraxcenter, University Hospital, Erasmus University in Rotterdam, the Netherlands.

The model however, was not produced commercially or given a model number.The initial popularity was not based on its image resolution but rather its ability to allow the operator to display and study movements, such as fetal cardiac motion, gross body movements and fetal breathing movements (see also Part 3).In the International Symposium on Real-time ultrasound in Perinatal Medicine held in Charleroi, Belgium in 1978, most of the presentations were based on results from the Vidoson. For almost ten years, real-time ultrasound has been used in many obstetrics departments.The transducers operated at either 2.25 or 4.5 MHz, again with 20 crystals producing 20 scan lines.The lateral resolution of this improved version at a dynamic range of 10d B was 3.7 mm at 6 cm and 6 mm at 10 cm depth.

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