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 ?
Superficial calcium: the leading edge of the acoustic shadowing is within the superficial half of plaque thickness.
They may have posterior acoustic shadowing or no change in the echogenic appearance of the tissue posterior to the tumor.
Fat necrosis appears as an echogenic, complex mass with cystic spaces or as a hypoechoic mass with or without posterior acoustic shadowing.
Case 2: USG: Hyperechogenic image with posterior acoustic shadowing S/O-Foreign Body in Abdominal Cavity.
Whilst atelectatic lung does have areas of homogeneous echogenicity, it also has highly echogenic regions with distal acoustic shadowing (due to the presence of air) (Figure 3).
Criteria Benign Appearance Shape Round, well-defined Margins Smooth, sharp, well-defined edges Echogenicity Isoechoic or slightly hypoechoic Internal echo pattern Homogeneous Acoustic shadowing None demonstrated Calcifications Macrocalcifications Compressibility Compressible Criteria Malignant Appearance Shape Irregular, lobulated Margins Irregular, indistinct edges Echogenicity Markedly hypoechoic or black Internal echo pattern Heterogeneous Acoustic shadowing Demonstrated Calcifications Microcalcifications Compressibility Noncompressible
Ultrasound revealed a circumscribed heterogeneous dermal mass with posterior acoustic shadowing and marked peripheral color flow measuring 2.
Ultrasound appearance of ascaris is reported in various studies as presence of long echogenic structure (linear or curved, single or multiple) with or without a central anechoic tube, mostly without acoustic shadowing.
1c) revealed a right lower quadrant inflammatory mass with posterior acoustic shadowing and surrounding loculated fluid collection.
Gas containing lesions are hyperechoic and demonstrate distal acoustic shadowing [2].

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