ultrasound (ul'tra-sownd?) [ ultra- + sound]
FETAL ULTRASOUND IMAGE
Inaudible sound in the frequency range of approx. 20,000 to 10 billion (109
) cycles/sec. Ultrasound has different velocities that differ in density and elasticity from one kind of tissue to the next. This property permits the use of ultrasound in outlining the shape of various tissues and organs in the body. In obstetrics, for example, identifying the size and position of the fetus, placenta, and umbilical cord enables estimation of gestational age, detects some fetal anomalies and fetal death, and facilitates other diagnostic procedures, e.g., amniocentesis. In physical therapy, the thermal effects of ultrasound are used to treat musculoskeletal injuries by warming tissue, increasing tissue extensibility, and improving local blood flow. Ultrasound is used to facilitate movement of certain medications, e.g., pain relievers, into tissue (phonophoresis). Ultrasound is also used with electric current for muscular stimulation. The diagnostic and therapeutic uses of ultrasound require special equipment. See: illustration
In ultrasonography a display in which imaging data are represented as echo amplitudes (on the y-axis) and time (on the x-axis), similar to the way electromagnetic waves are represented on an oscilloscope. Synonym: A-mode; A-mode (amplitude modulation) display
In ultrasonography, a display that uses dots of differing intensities to represent echoes received from tissues that more strongly or weakly reflect sound waves. Synonym: ; B-scan
continuous wave ultrasound
A form of ultrasound used in echocardiography in which a dual crystal transducer continuously generates and receives an ultrasound signal. It is used to measure blood velocities, e.g., across heart valves. A serious shortcoming of continuous wave ultrasound is its inability to identify depth accurately.
continuous wave Doppler ultrasound
Doppler ultrasonography that uses spectral Doppler in a constant series of echoes both originating and being received by the same transducer. It is used to study obstruction to blood flow through vessels.
duplex Doppler ultrasound
Doppler ultrasonography that uses a transducer with two functions: pulsed-wave Doppler and B-mode imaging.
endobronchial ultrasound Abbreviation: EBUS
The use of ultrasonic transducers carried within a bronchoscope to evaluate tissues in or adjacent to the trachea and bronchi. EBUS can be used to identify solid masses to be biopsied. It helps distinguish solid masses, which may be malignant, from blood vessels such as the aorta or pulmonary arteries, which should not be penetrated with a biopsy needle.
endorectal ultrasound Abbreviation: ERUS
1. An imaging technique in which an ultrasound transducer is placed inside the rectum and used to evaluate the depth of colon and prostate cancers and the extent to which they have spread to neighboring lymph nodes.
2. Transrectal ultrasound.
endovaginal ultrasoundTransvaginal ultrasonography.
high-intensity focused ultrasound Abbreviation: HIFU
A noninvasive form of thermotherapy in which ultrasonic energy is used to generate heat for therapeutic purposes within the body. HIFU has been used to cauterize internal blood vessels that are bleeding, to cavitate or coagulate growths or solid malignancies, e.g., breast, liver, pancreatic, or prostate cancers. The ultrasound transducer is placed on the skin and the energy from the transducer is directed at radiographically localized tissue depths and volumes.
The use of ultrasonography as a guide for local injections or for the placement of catheters, needles, or probes into body cavities or tumors. Interventional ultrasound is used to treat hepatocellular carcinoma, prostate cancer, and other solid tumors.
intravascular ultrasound Abbreviation: IVUS
In ultrasonography, a technique for imaging intimal tissue proliferation and blood vessel blockages.
keepsake fetal ultrasound
A colloquialism for a three-dimensional image of an unborn child visualized in the womb with ultrasonography treated as a memento. The image is kept by expectant parents as part of a scrapbook of pregnancy and anticipated childbirth.
An ultrasonic display mode in which the motion of structures is seen on the vertical axis of the display, used, e.g., to show the movement of the heart's valves and walls during diastole and systole. Synonym: motion-mode display; time-motion mode ultrasound
Examination of the pelvis with an ultrasonic transducer placed inside the vagina. It is used in assessment of diseases or conditions affecting the cervix, uterus, fallopian tubes, or ovaries. Synonym: endovaginal ultrasound.
pulsed-wave Doppler ultrasound, pulsed Doppler ultrasound
quantitative ultrasound Abbreviation: QUS
Measurement of the density of a body tissue, e.g., bone, by determining how rapidly sound travels through the tissue and how different sonic wavelengths are absorbed. QUS is used to diagnose osteopenia and osteoporosis.
A sonographic procedure that provides rapid, multiple images of an anatomical structure in the form of motion.
time-motion mode ultrasoundM-mode ultrasound.
transrectal ultrasound Abbreviation: TRUS
Imaging of the prostate gland and periprostatic tissues with an ultrasound transducer inserted into the anus and directed toward the anterior rectum. It is used to identify malignant tumors, guide biopsies, and provide assessments of tumor staging. Synonym: endorectal ultrasound (2)
Medical Dictionary, © 2009 Farlex and Partners
Patient discussion about Ultrasound
Q. Do doctors normally do ultrasounds to prove you have mis carried?? 2 weeks ago i found out i was pregnant, i started spottion so we went to the hospital where they toldl me i miscarried, but they did not do any alternative tests to prove it not even check my Hcg levels. Im wandering if i should get a second opinion to make sure.
A. Congratulations on the new pregnancy - that's wonderful news!
Q. what does it mean when an ultrasound shows an empty amniotic sac and no baby?
A. This exact thing happened with my friend who is now 22 weeks with her first baby. She had 2 additional sacs - both empty - and the doctor said that the pregnancy had probably started out as triplets but that only one of the embryos had actually established and continued to grow.
Her doctor said it is very common for a woman to have more than one egg fertilize but that in most cases the pregnancy continues as a singleton only. She told my friend that the empty sacs would just disappear through time (which they did) and that they posed no danger to her baby.
Q. what kind of uses the medicine do with computers related to ultra sound? how does the computer helps the doctors in the ultra sound? what do the compuers use for?
A. the computers help the doctors (in ultrasound cases) to interpret/convert the ultrasound waves into a specific imaging showed in the monitor. by that a doctor can find what is normal or not inside the patient's body.More discussions about Ultrasound
for pregnancy purposes, it really helps patient in antenatal screening to find some abnormalities (if there's any) and to monitor the fetus' development along the 9-months pregnancy.
yesterday I wrote a short article about ultrasound update : http://doctoradhi.com/blog/?p=388
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