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-	Typical diagnostic sonographic scanners operate in the frequency range of 2 to 18 megahertz, though frequencies up to 50�100 megahertz have been used experimentally in a technique known as biomicroscopy in special regions, such as the anterior chamber of the eye.[citation needed] The choice of frequency is a trade-off between spatial resolution of the image and imaging depth: lower frequencies produce less resolution but image deeper into the body. Higher frequency sound waves have a smaller wavelength and thus are capable of reflecting or scattering from smaller structures. Higher frequency sound waves also have a larger attenuation coefficient and thus are more readily absorbed in tissue, limiting the depth of penetration of the sound wave into the body.	+	Nunc est nulla, condimentum vitae turpis eu, scelerisque interdum eros. Aenean ultrices risus urna. Suspendisse sapien eros, viverra in venenatis at, ullamcorper eu lorem. Quisque gravida, turpis sit amet ultrices semper, nulla purus malesuada lacus, sit amet condimentum lacus felis in turpis. Cras vitae nunc vitae diam tempus accumsan quis at neque. Sed a mattis libero. In molestie rhoncus risus, et hendrerit urna ullamcorper sit amet. Suspendisse euismod tristique lacinia. Nullam suscipit, arcu dictum maximus suscipit, mauris enim commodo ipsum, id fermentum diam lacus eget ante. In hac habitasse platea dictumst. Praesent sit amet enim sit amet eros dictum pretium. Curabitur nec sollicitudin urna, consectetur pulvinar lorem. Sed ut metus suscipit, hendrerit purus sit amet, mattis turpis. Suspendisse dictum quam at neque venenatis, sit amet convallis dolor auctor. Duis rutrum purus non felis pharetra, eget pretium magna convallis.
-	Sonography (ultrasonography) is widely used in medicine. It is possible to perform both diagnosis and therapeutic procedures, using ultrasound to guide interventional procedures (for instance biopsies or drainage of fluid collections). Sonographers are medical professionals who perform scans which are then typically interpreted by Radiologists, physicians who specialize in the application and interpretation of a wide variety of medical imaging modalities, or by Cardiologists in the case of cardiac ultrasonography (echocardiography). Sonographers typically use a hand-held probe (called a transducer) that is placed directly on and moved over the patient. Increasingly, clinicians (physicians and other healthcare professionals who provide direct patient care) are using ultrasound in their office and hospital practices, for efficient, low-cost, dynamic diagnostic imaging that facilitates treatment planning while avoiding any radiation exposure.	+	Donec at mi mi. Fusce rhoncus tellus sed tellus cursus sodales. Cras suscipit nulla sit amet tristique mattis. Praesent auctor felis ut velit consequat, et tincidunt urna congue. Phasellus varius lacinia nunc ut cursus. Sed vitae leo a ex ultrices feugiat eget a mi. Aliquam erat volutpat. Integer rhoncus, neque nec mollis placerat, massa risus facilisis velit, nec semper enim dolor in tellus. In varius turpis ac metus egestas elementum.

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Current revision as of 17:51, 31 January 2017

Nunc est nulla, condimentum vitae turpis eu, scelerisque interdum eros. Aenean ultrices risus urna. Suspendisse sapien eros, viverra in venenatis at, ullamcorper eu lorem. Quisque gravida, turpis sit amet ultrices semper, nulla purus malesuada lacus, sit amet condimentum lacus felis in turpis. Cras vitae nunc vitae diam tempus accumsan quis at neque. Sed a mattis libero. In molestie rhoncus risus, et hendrerit urna ullamcorper sit amet. Suspendisse euismod tristique lacinia. Nullam suscipit, arcu dictum maximus suscipit, mauris enim commodo ipsum, id fermentum diam lacus eget ante. In hac habitasse platea dictumst. Praesent sit amet enim sit amet eros dictum pretium. Curabitur nec sollicitudin urna, consectetur pulvinar lorem. Sed ut metus suscipit, hendrerit purus sit amet, mattis turpis. Suspendisse dictum quam at neque venenatis, sit amet convallis dolor auctor. Duis rutrum purus non felis pharetra, eget pretium magna convallis.

Donec at mi mi. Fusce rhoncus tellus sed tellus cursus sodales. Cras suscipit nulla sit amet tristique mattis. Praesent auctor felis ut velit consequat, et tincidunt urna congue. Phasellus varius lacinia nunc ut cursus. Sed vitae leo a ex ultrices feugiat eget a mi. Aliquam erat volutpat. Integer rhoncus, neque nec mollis placerat, massa risus facilisis velit, nec semper enim dolor in tellus. In varius turpis ac metus egestas elementum.