A-mode

A-mode

(mōd),
In diagnostic ultrasound, a one-dimensional presentation of a reflected sound wave in which echo amplitude (A) is displayed along the vertical axis and echo delay (depth) along the horizontal axis; the echo information derives from tissue interfaces along a single line in the direction of the sound beam.

A-mode

amplitude modulation in diagnostic ultrasonography. It represents the time required for the ultrasound beam to strike a tissue interface and return its signal to the transducer. The greater the reflection at the tissue interface, the larger the signal amplitude on the A-mode screen. See also B-mode, M-mode.

A-mode

(mōd)
diagnostic ultrasound A one-dimensional presentation of a reflected sound wave in which echo amplitude (A) is displayed along the vertical axis and time of rebound (depth) along the horizontal axis; the echo information is presented from interfaces along a single line in the direction of the sound beam.

A-mode

amplitude mode. See A-mode ultrasonography.
References in periodicals archive ?
A-mode is the amplitude of the replicated wave, which represents the amount of the reflected ultrasound waves.
B-mode, or brightness modulation, scanning uses a linear array to produce a two-dimensional image by combining A-mode signals from various detections (Noce, 1990).
A-mode ultrasonic biometry using 10 MHz linear transducer in amplitude mode was used to measure different intraocular distances (anterior chamber depth, lens thickness and axial length).
Eye muscle area (EMA) was estimated by A-mode ultrasound scanning at 5 cm ventral to the dorsal point of the last thoracic vertebra.
The transducer was placed in a longitudinal position (sagittal plane) until optimal Bscan images, according to echoes of the A-mode, were obtained.
Although this control strategy works well, in future work we will simulate the SEMG-based 1-DOF prosthetic hand to collect the SMG from both the extensor and flexor with a multichannel A-mode ultrasound system for higher control accuracy.
An A-mode SOU was not performed because of the patient's lack of cooperation.
A-mode, B-scan, and a new device that performs an existing technology for an area of the body for which a code has been created, is reported according to the procedure performed.
At the time of testing, body weight was measured and ultrasound scanning on the back was made with A-mode (amplitude mode) scanners.
Although the two-dimensional SMG signal from ultrasound images is capable of detecting continuous muscle thickness changes, A-mode ultrasound, with a more portable and compact transducer, should be a less expensive and more practical alternative for detecting muscle thickness changes during contraction.