The History of Ultrasound

Ultrasound in maxillofacial imaging: A review

“…[11] The High-frequency US has a long Fresnal zone and a greater depth resolution, although the tissue absorption also increases. [13] US pulse comprises a collection of frequencies called the bandwidth (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). Higher is the fundamental frequency, better is said to be the spatial resolution.…”

“…[4] Doppler mode this mode is based on the "Doppler effect" which is defined as "the observed changes in the frequency of transmitted waves when relative motion exists between the source of the wave and an observer." [16] This enables the examination of blood flow in vessels on the basis of backscatter from erythrocytes.…”

Accuracy of the Fetal Echocardiography in the High Risk Pregnancies

“…1,2 Among them, the cardiology gained a huge advantage of 2D ultrasonography for postnatal diagnostics and treatment of congenital cardiac defects. Jan Donald, the father of the modern obstetrical ultrasonography, could not predict how helpful and significant ultrasonography will become for the prenatal diagnosis of fetal cardiac problems.…”

Pierre Curie: the anonymous neurosurgical contributor

“…6,14,26,47 One of his pupils was Paul Langevin, who was later instrumental in the development of sonar technology, an application of piezoelectricity that used sound waves to detect underwater vessels. 6,7,26,47,48,62 This sonar device generated echoes that reflected off of underwater objects, applying pressure to piezoelectric transducers upon their return, which converted the signal to electricity and allowed for the calculation of the range, speed, and position of underwater objects. 6,7,26,47,48,62 the Power Couple of Physics: Pierre and marie Pierre Curie and Marie Skłodowska (Fig.…”

“…6,7,26,47,48,62 This sonar device generated echoes that reflected off of underwater objects, applying pressure to piezoelectric transducers upon their return, which converted the signal to electricity and allowed for the calculation of the range, speed, and position of underwater objects. 6,7,26,47,48,62 the Power Couple of Physics: Pierre and marie Pierre Curie and Marie Skłodowska (Fig. 4) were initially introduced to each other by a mutual friend in 1894, when the Polish-born Marie had just earned her licentiate in physics at the Sorbonne.…”