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ECHO

Abbreviation for enteric cytopathic human orphan. See: ECHO virus.

ech·o

(ek'ō),
1. A reverberating sound sometimes heard during auscultation of the chest.
2. In ultrasonography, the acoustic signal received from scattering or reflecting structures or the corresponding pattern of light on a CRT or ultrasonogram.
3. In magnetic resonance imaging, the signal detected following an inverting pulse.
[G.]

echo

(ek´o) a repeated sound, produced by reverberation of sound waves; also, the reflection of ultrasonic, radio, and radar waves.
amphoric echo  a resonant repetition heard on auscultation of the chest, at an interval after a vocal sound.
metallic echo  a ringing repetition of heart sounds sometimes heard in patients with pneumopericardium or pneumothorax.

echo

[ek′ō]
1 the reflection of an ultrasound wave back to the transducer from a structure in the plane of the sound beam.
2 (informal) echoradiography.

ech·o

(ek'ō)
1. A reverberating sound sometimes heard during auscultation of the chest.
2. ultrasonography The acoustic signal received from scattering or reflecting structures, or the corresponding pattern of light on a CRT or ultrasonogram.
3. magnetic resonance imaging The signal detected following an inverting pulse.
[G.]

ultrasonography 

A technique utilizing high frequency ultrasound waves (greater than 18 000 Hz) emitted by a transducer placed near the eye. The silicone probe, which rests on the eye, is separated from the transducer by a water column to segregate the noise from the transducer. The technique is used to make biometric measurements such as the axial length of the eye, the depth of the anterior chamber, the thickness of the lens, the distance between the back of the lens and the retina, the thickness of the cornea and detect ocular pathology. The ultrasound wave is reflected back when it encounters a change in density (or elasticity) of the medium through which it is passing. The reflected vibration is called an echo. Echoes from the interfaces between the various media of the eye are converted into an electrical potential by a piezoelectrical crystal and can be displayed as deflections or spikes on a cathode-ray oscilloscope.There are two basic techniques used for examination: a contact system (often referred to as applanation) described above in which the probe is in contact with cornea and an immersion system in which the transducer and the cornea are separated by a water bath. This latter method eliminates the risk of indentation of the cornea and underestimation of the anterior chamber depth and axial length. Two types of ultrasonographic measurements are used: (1) The time-amplitude or A-scan which measures the time or distance from the transducer to the interface and back. Thus echoes from surfaces deeper within the eye take longer to return to the transducer for conversion into electrical potential and so they appear further along the time base on the oscilloscope display. The A-scan is useful for the study of the biometric measurements, as well as measurements of intraocular tumour size (e.g. choroidal melanoma) (Fig. U1). (2) The intensity-modulated or B-scan in which various scans are taken through the pupillary area and any change in acoustic impedance is shown as a dot on the oscilloscope screen, and these join up as the transducer moves across a meridian. The B-scan is useful to indicate the position of a retinal or vitreous detachment, or of an intraocular foreign body or a tumour, and for the examination of the orbit. The B-scan is especially useful in the examination of the posterior structures of the eye when opacities prevent ophthalmoscopic examination (e.g. cataract, corneal oedema). Syn. echography. See biometry of the eye; axial length of the eye.
Fig. U1 Histogram of ultrasound reflections (or echoes) in the eye. Echoes from the various boundaries are given against total time, i.e. the time interval from the cornea to the boundary and back to the cornea. The velocity of the ultrasound waves in the eye is approximately 1550 m/s (it is 1641 m/s in the lens and 1532 m/s in the humours). In the above diagram the total time between the cornea and the retina is 32 μs. The length is then equal to 32/2 ✕ 10 −6 ✕ 1550 ✕ 10 3 = 24enlarge picture
Fig. U1 Histogram of ultrasound reflections (or echoes) in the eye. Echoes from the various boundaries are given against total time, i.e. the time interval from the cornea to the boundary and back to the cornea. The velocity of the ultrasound waves in the eye is approximately 1550 m/s (it is 1641 m/s in the lens and 1532 m/s in the humours). In the above diagram the total time between the cornea and the retina is 32 μs. The length is then equal to 32/2 ✕ 10−6 ✕ 1550 ✕ 103 = 24

ech·o

(ek'ō)
1. Reverberating sound sometimes heard during chest auscultation.
2. In ultrasonography, acoustic signal received from scattering or reflecting structures or corresponding pattern of light on a cathose ray tube or ultrasonogram.
3. In magnetic resonance imaging, signal detected following an inverting pulse.
[G.]

echo

a reflected sound; the basis for echocardiography and ultrasonography.

Patient discussion about echo

Q. My mother had a chest pain and she was sent for a TEE. When do you need a TEE and when a normal echo is fine? My mother had a chest pain few weeks ago. we were sure its a heart attack and went to the ER. There the doctors did some tests and she was sent for a (trans thoracic echocardiogram) TEE. I want to know when do you need a TEE and when you can do just a normal echocardiogram because the TEE was very painful for her and we want to know if ther was a better way.

A. The main difference between TEE and normal echo is that in TEE u put the transducer directly in the esophagus. The transducer is the same and the idea is to put it as close as possible to the heart.
As far as I know there are some heart situations the TEE is better for diagnosis that normal echo. Maybe your mom had one of those situations?
I can recommend you to ask the ER doctor. he will probably be able to give a better explanation for his choice

More discussions about echo
References in classic literature ?
Not only would the echoes die away, as though the steps had gone; but, echoes of other steps that never came would be heard in their stead, and would die away for good when they seemed close at hand.
shouted Blockhead- Hans, singing so that the echoes were roused far and near.
No echoes of that discord shall be heard Where Father Tagus rolls, or on the banks Of olive-bordered Betis; to the rocks Or in deep caverns shall my plaint be told, And by a lifeless tongue in living words; Or in dark valleys or on lonely shores, Where neither foot of man nor sunbeam falls; Or in among the poison-breathing swarms Of monsters nourished by the sluggish Nile.
And all with pearl and ruby glowing Was the fair palace door, Through which came flowing, flowing, flowing And sparkling evermore, A troop of Echoes whose sweet duty Was but to sing, In voices of surpassing beauty, The wit and wisdom of their king.
He was overjoyed at seeing me, and to know the meaning of the fight, faint echoes of which had reached his prison cell.
Westenra has got an idea that sleep-walkers always go out on roofs of houses and along the edges of cliffs and then get suddenly wakened and fall over with a despairing cry that echoes all over the place.
The hooting note rose and rose amidst its echoes, to at last an ear-penetrating intensity.
His room was an attic and as he thrust his head out, up and down the street there were a dozen echoes to the noise of his window sash, and heads in every kind of night disarray appeared.