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Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less. Ultrasound can be generated at very high frequencies; ultrasound is used for sonochemistry at frequencies up to multiple hundreds of kilohertz.
Medical ultrasound includes diagnostic techniques (mainly imaging techniques) using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics (e.g., distances and velocities) or to generate an informative audible sound.
Meaning Nφ: Neutrophil: Na: sodium (from Latin natrium) NA: negative appendectomy NAAT: Nucleic Acid Amplification Test: NABS: normoactive bowel sounds NAC: n-acetyl cysteine NaCl sodium chloride (saline) NAD: no abnormality detected no apparent distress no appreciable disease (and many variations of the above) NAD + nicotinamide adenine ...
Meaning Origin language and etymology Example(s) -ula, -ule: small Latin Nodule ultra-beyond, excessive Latin ultra: ultrasound, ultraviolet: umbilic-of or pertaining to the navel, the umbilicus: Latin umbilīcus, navel, belly-button umbilical: ungui-of or pertaining to the nail, a claw Latin unguis, nail, claw unguiform, ungual: un(i)-one ...
Diagnostic medical sonography (DMS), a branch of diagnostic medical imaging, is the use of imaging by medical ultrasound for medical diagnosis. DMS uses non-ionizing ultrasound to produce 2D and 3D images of the body. In Canada, the credentialing for diagnostic medical sonography is the Canadian Association of Registered Ultrasound Professionals.
Echogenicity (sometimes as echogenecity) or echogeneity is the ability to bounce an echo, e.g. return the signal in medical ultrasound examinations. In other words, echogenicity is higher when the surface bouncing the sound echo reflects increased sound waves.
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Meaning U OSM: urine osmolality UA: urinalysis unstable angina U/A upon arrival UAE: Uterine Artery Embolization (synonym for Uterine Fibroid Embolization) UBT: urea breath test: UC: ulcerative colitis uterine contraction: UCHD: usual childhood diseases (see list of childhood diseases) UCTD: Undifferentiated connective tissue disease: UCx ...