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Is ultrasound not so sound? In addition to incessant wireless radiation exposure, most fetuses are now routinely scanned several times during gestation by medical ultrasound imaging equipment. Scant weeks after a human embryo is implanted in-utero, at a time when the newly united cells are the most vulnerable, medical personnel engage in an ultrasound inquisition to determine its gestational age. A vaginal probe is often used to position a high frequency sound transducer as close as possible to the tiny new life form. Ultrasound technology vibrates a fetus with mechanical pressure waves at millions of cycles per second. A scan can last up to one hour. The power density used is around 720 milliwatts/cm2-eight times the power density allowed prior to 1993.57 Secondary vibrations inherent in ultrasound waves are said to produce intrauterine noise as loud as 100 decibels, despite the fact that noise levels over 85 decibels are designated as harmful to human hearing. The fetus reportedly hears an ultrasound scan at a high pitch which is, comparatively speaking, as loud as a train pulling into a station.58 The ultra powerful Doppler ultrasound equipment is especially brutal. One minute of Doppler is equal to 35 minutes of non-Doppler imaging. Doppler is often used on pregnant women transvaginally. Often employed for monitoring fetal circulation, Doppler equipment has potential to produce biologically significant temperature hikes in both bone and tissue interfaces.59 One report notes that brain structures lying close to the fetal skull, such as the pituitary gland and the hypothalamus, are at special risk of over-heating, while on-screen temperature safety indexes can give false temperature readings.60 Powerful 3-D and 4-D ultrasound equipment, which can produce cuddly 3-dimensional images, is used by opportunists to create fetal "portraits" and videos for profit.61 These merciless, inflammation-producing scanning sessions can last up to 90 minutes. The FDA warns that such frivolous use of ultrasound is dangerous, but critics complain that the agency has yet to enforce a ban on this commercial exploitation of the fetus. In 1999, Irish researchers found that a 15-minute, 8 megahertz ultrasound scan of mice produced abnormal rate of cell division and abnormal cell death. Among these researchers was Dr. Patrick Brennan who suspects that the scans may be damaging human fetal DNA, resulting in a delay of cell division and repair, or in the switching on of a tumor suppressor gene that controls cell death.62 In 2004, Pasko Rakic, chairman of the Neurobiology Department at Yale University, reported disruption of the normal migration of cells in the brains of fetal mice following ultrasound scans. Brain cells failed to grow into their proper positions and remained scattered in incorrect parts of the brain.63 A number of other studies have established a possible correlation between prenatal ultrasound exposure and dyslexia, delayed speech development, reduced birth weight and non-right handedness.64 Left-handedness is statistically linked to many cognitive and developmental problems, ranging from learning difficulties to autism and epilepsy. There are reports that the FDA has failed to ensure that medical sonographers are properly trained. Ultrasound expert Dr. Jacques Abramowicz of Rush University is quoted as saying that only two to three percent of ultrasound technicians understand the complexities of thermal and mechanical indexes.65 While the American Institute of Ultrasound Medicine (AIUM) denies negative biological effects of ultrasound on fetuses, it admits to the possibility that negative outcomes may be identified in the future. No one yet knows to what extent our devastating rates of childhood diabetes, allergy and learning impairment may be rooted in over-use of fetal monitoring by poorly trained technicians. http://www.opednews.com/articles/Microw ... 8-202.html erezijos?pasidomėkite, kiek moterų po ultragarso tyrimų patyrė persileidimus...

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