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[quote=Anonymous]As you can see below, transvaginal scanners have been around since 1988. Also, regular ultrasound is able to pick up a heartbeat at 7 weeks.

http://www.ob-ultrasound.net/history2.html

Despite the advantages of transvaginal scans, its use had waited almost 20 years to become practical and popular in gynecological scanning. Athough the need and technology were there, the really practical real-time transvaginal scanning probe was not "invented" until 1985 when KretzTechnik® of Austria produced their first real-time mechanical vaginal sector scanner. The transducer had a scan angle of 240 degrees and was designed with the use for transvaginal ovum retrieval in mind, in collaborations with IVF pioneers Wilfried Feichtinger and Peter Kemeter in Austria. The coming of such mechanical devices was also in part the outcome of advances in microprocessor controller circuitry and ferro-magnetics resulting in much smaller and more efficient motors.

Dutch manufacturer Philips® followed on with one of the earliest mechanical vaginal scanners in the second half of 1986. The probe was in the shape of a microphone with a roundish elongated head housing a 5MHz 13mm wobbler transducer. It could be retro-fitted onto their real-time scanner SDR 1550 which first debuted in 1985. Although they produced excellent images compared to their abdominal counterpart, mechanical endovaginal designs were not favored by many ultrasound manufacturers, partly because of the vibration that was generated.

Mechanical designs were rapidly followed by electronic array versions which are rather like a reduced-size abdominal convex sector transducer that has appeared around the same time from other manufacturers in Japan. ALOKA® produced an electronic sector version which could be retofitted onto their older model the SSD-256. GE Medical Systems® produced their first endovaginal probe to fit their RT3200 in mid 1987. By 1988 most manufacturers had endovaginal options installed in their scanners.

The advent of tranvaginal scanning (at higher frequencies of 5 - 8 MHz and resulting in much finer resolution) had a significant impact on the diagnosis of gynecological and early pregnancy pathologies. In particular the accurate recognition of fetal cardiac pulsations in missed abortions was facilitated at an early gestational age of 6 weeks.[/quote]

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