| echocardiography, four-dimensional | Dynamic three-dimensional echocardiography using the added dimension of time to impart the cinematic perception of motion. (mayo clin proc 1993;68:221-40) (12 Dec 1998) |
|---|---|
| echocardiography, three-dimensional | Echocardiography amplified by the addition of depth to the conventional two-dimensional echocardiography visualizing only the length and width of the heart. Three-dimensional ultrasound imaging was first described in 1961 but its application to echocardiography did not take place until 1974. (mayo clin proc 1993;68:221-40) (12 Dec 1998) |
| echocardiography, transesophageal | Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues using a transducer placed in the oesophagus. (12 Dec 1998) |
| echoencephalography | Use of reflected ultrasound in the diagnosis of intracranial pathologic processes. (12 Dec 1998) |
| echoes | <radiobiology> Wave packets (pulses) which have been reflected or otherwise returned to the detector, which are sufficiently delayed and retain sufficient magnitude so that they are perceived as a signal distinct from the one transmitted directly. (In other words, just like sound echoes, only for analogous phenomena with other waves.) (09 Oct 1997) |
| echogenic | <radiology> Producing an acoustic shadow. Something that can be seen on an ultrasound or echocardiogram. Often relates to a more prominent feature of a normal structure. (10 Nov 1998) |
| echogenic pancreas | <radiology> Fatty degeneration, cystic fibrosis, calcification (chronic pancreatitis) (12 Dec 1998) |
| echogram | A record obtained using high frequency acoustic reflection techniques in any one of the various display modes, especially an echocardiogram. See: ultrasonogram. Origin: echo + G. Gramma, a diagram (05 Mar 2000) |
| echographer | A person who performs and interprets ultrasonographic examinations. Synonym: echographer, sonographer. (05 Mar 2000) |
| echographia | A form of agraphia in which one cannot write spontaneously, but can write from dictation or copy. Origin: echo + G. Grapho, to write (05 Mar 2000) |
| echography | <investigation> Ultrasonography, the use of ultrasound as a diagnostic aid. Ultrasound waves are directed at the tissues and a record is made, as on an oscilloscope, of the waves reflected back through the tissues, which indicate interfaces of different acoustic densities and thus differentiate between solid and cystic structures. (18 Nov 1997) |
| echokinesis | Echokinesia Synonym: echopraxia. Origin: echo + G. Kinesis, movement (05 Mar 2000) |
| echolalia | A disorder of speech where there is an involuntary repetition several times of the same word. (27 Sep 1997) |
| echolocation | An auditory orientation mechanism involving the emission of high frequency sounds which are reflected back to the emitter (animal). (12 Dec 1998) |
| echomatism | Synonym: echopraxia. Origin: echo + G. Matizo, to strive to do (05 Mar 2000) |