对于这个问题，需要更权威的回答
http://en.wikipedia.org/wiki/Obstetric_ultrasonography
一搜网络上的资料，发现商业气息太浓重。这种事情，能只能从商业的角度考虑吗？！！！
特地花了一些功夫，找了下英文术语，把维基中相关的条目找到。希望大家仔细的阅读，不要轻易相信商业宣传！
为了方便大家，我把关于安全的部分摘录下来：
Safety issues
3D rendering of the fetal spine in a scan at 19 weeks of pregnancy
Current evidence indicates that diagnostic ultrasound is safe for the unborn child, unlike radiographs, which employ ionizing radiation. However, no randomized controlled trials have been undertaken to test the safety of the technology, and thus ultrasound procedures are generally not done repeatedly unless medically indicated.
A 2006 study on genetically modified mice exposed to ultrasound (5–240 minutes a day) showed neurological changes in the exposed fetuses. Some of the rodent brain cells failed to migrate to their proper position and remained scattered in incorrect parts of the brain.[16]
The 1985 maximum power allowed by the U.S. Food and Drug Administration (FDA) of 180 milliwatts per square cm [17] is well under the levels used in therapeutic ultrasound, but still higher than the 30-80 milliwatts per square cm range of the Statison V veterinary LIPUS device.[18] LIPUS has been shown to affect tissue growth in as little as 20 minutes of time with repeated daily applications. Adding to the similarity, LIPUS and medical ultrasound both operate in the 1 to 10 MHz range.
While the benefits of medical ultrasound outweigh any risks, vanity uses such as making 3D ultrasound movies without a doctor's order present a possibly unnecessary, but unknown risk to a developing fetus. The FDA discourages its use for non-medical purposes such as fetal keepsake videos and photos, even though it is the same technology used in hospitals. The demand for keepsake ultrasound products in medical environments has prompted commercial solutions such as self-serve software that allows the patient to create a "keepsake" from the ultrasound imagery recorded during a medical ultrasound procedure.[19]
可以说，彩超有好处的一面，但也必须把可能造成的危害正确的告诉大家。
2006年的实验，说明长期照射，会对大脑的神经造成影响。具体见条文。国外的明确不建议做！：
The FDA discourages its use for non-medical purposes such as fetal keepsake videos and photos, even though it is the same technology used in hospitals.
http://en.wikipedia.org/wiki/Obstetric_ultrasonography
一搜网络上的资料，发现商业气息太浓重。这种事情，能只能从商业的角度考虑吗？！！！
特地花了一些功夫，找了下英文术语，把维基中相关的条目找到。希望大家仔细的阅读，不要轻易相信商业宣传！
为了方便大家，我把关于安全的部分摘录下来：
Safety issues
3D rendering of the fetal spine in a scan at 19 weeks of pregnancyCurrent evidence indicates that diagnostic ultrasound is safe for the unborn child, unlike radiographs, which employ ionizing radiation. However, no randomized controlled trials have been undertaken to test the safety of the technology, and thus ultrasound procedures are generally not done repeatedly unless medically indicated.
A 2006 study on genetically modified mice exposed to ultrasound (5–240 minutes a day) showed neurological changes in the exposed fetuses. Some of the rodent brain cells failed to migrate to their proper position and remained scattered in incorrect parts of the brain.[16]
The 1985 maximum power allowed by the U.S. Food and Drug Administration (FDA) of 180 milliwatts per square cm [17] is well under the levels used in therapeutic ultrasound, but still higher than the 30-80 milliwatts per square cm range of the Statison V veterinary LIPUS device.[18] LIPUS has been shown to affect tissue growth in as little as 20 minutes of time with repeated daily applications. Adding to the similarity, LIPUS and medical ultrasound both operate in the 1 to 10 MHz range.
While the benefits of medical ultrasound outweigh any risks, vanity uses such as making 3D ultrasound movies without a doctor's order present a possibly unnecessary, but unknown risk to a developing fetus. The FDA discourages its use for non-medical purposes such as fetal keepsake videos and photos, even though it is the same technology used in hospitals. The demand for keepsake ultrasound products in medical environments has prompted commercial solutions such as self-serve software that allows the patient to create a "keepsake" from the ultrasound imagery recorded during a medical ultrasound procedure.[19]
可以说，彩超有好处的一面，但也必须把可能造成的危害正确的告诉大家。
2006年的实验，说明长期照射，会对大脑的神经造成影响。具体见条文。国外的明确不建议做！：
The FDA discourages its use for non-medical purposes such as fetal keepsake videos and photos, even though it is the same technology used in hospitals.
