acoustic

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acoustic

, acoustical
1. of or related to sound, the sense of hearing, or acoustics
2. designed to respond to, absorb, or control sound
3. (of a musical instrument or recording) without electronic amplification

acoustic

[ə′küs·tik]
(acoustics)
Relating to, containing, producing, arising from, actuated by, or carrying sound.

acoustic, acoustical

The qualifying adjectives acoustic and acoustical have the following meanings: arising from, actuated by, containing, producing, or related to sound. In general, acoustic is used when the term being qualified designates something that has the properties, dimensions, or physical characteristics associated with sound waves; acoustical is used when the term being qualified does not explicitly designate something that has the properties, dimensions, or physical characteristics of sound (e.g., acoustical engineering). However, sometimes these two terms are used interchangeably.

acoustic

Associated with sound at frequencies that are audible to human beings.
References in periodicals archive ?
Almost all tubular carcinomas in the literature are hypoechoic masses with posterior acoustic shadowing (9, 11).
A 10 mm solid nodule was shown, with irregular and ill-defined margins, taller rather than wider shaped, with a hyperechoic rim and posterior acoustic shadowing: Rocha A, Servicio de Radiologia, Hospital Povisa, Vigo, Spain.
These renal echogenic foci were bright foci, which were not giving significant distal acoustic shadowing. They were usually located at tips of medullary papillae, adjacent to renal calyces and sometimes in renal pelvis of the kidneys.
In ultrasonography, the hyperechoic structure showing acoustic shadowing below it is confirmation of calculi.
Large side branches, signal dropout behind stent struts and acoustic shadowing due to extensive calcification can cause difficulty in these measurements.
No reverberation, acoustic shadowing, or flow on color or power Doppler imaging was noted.
In some cases, irregular acoustic shadowing directly below the palpable nodule may be the only indication of a pathologic process.[18,19] (See Fig.
Features common to primary breast cancer such as spiculations, calcification, parenchymal distortion, acoustic shadowing, secondary skin or nipple changes are typically not observed with hematogenous metastases to the breast.
* Mature cystic teratomas produce hyperechoic lines and dots, sometimes known as "dermoid mesh," acoustic shadowing, and a hyperechoic nodule (FIGURE 3, page 22).
Hyperechogenic image with posterior acoustic shadowing (CASE--2).
SYDNEY--The brain shadowing sign--a sharply demarcated area of acoustic shadowing on ultrasound--is a novel and easily identifiable marker for fetal craniosynostosis, a small multicenter retrospective study showed.
(5,6) Moreover, the marked acoustic shadowing behind the echogenic band produced by a bezoar differs from the "dirty" shadowing generated by ingested gas and food within the stomach.

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