Automated 3-Axis Scanning Ultrasound Test Tank
Provides computer-controlled motorized micro-positioning (10 μm step resolution) in degassed deionized water.
Biomedical Engineering / Ultrasound Acoustic Attenuation
FREE TO EXPLORELABORATORY 35 · BIOMEDICAL ENGINEERING
Medical Ultrasound Transducer Acoustic Beam Attenuation & Spatial Profiling
Determine the acoustic attenuation coefficient α_u of a tissue-mimicking phantom in an automated ultrasound test tank across depths using a calibrated PVDF needle hydrophone. Explore interactive physiological instrumentation simulation, biomechanics, and biomedical engineering telemetry.
BIOINSTRUMENTATION · BIOSIGNALS · BIOMECHANICS · IMAGING
Your virtual biomedical engineering laboratory.
ACOUSTIC SIGNAL ATTENUATION A_DB—
PHYSIOLOGICAL & TEST CELL TELEMETRY
Ready to sample with Depth z = 6.0 cm.
Adjust Depth z, then execute biomedical trial.
Biomedical engineering telemetry and physiological states are evaluated rigorously using 64-bit IEEE 754 precision. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity biological and physiological modeling.
Biomedical assumptions and boundary condition limits
The linear decibel attenuation model applies to homogeneous media; human anatomy presents complex layered structures with refraction and reverberation. Evaluated using a 3.5 MHz focused piezoelectric transducer (diameter 19 mm, focal length 60 mm) submerged in degassed water and traversing a CIRS tissue-mimicking phantom (speed of sound 1540 m/s). Acoustic pressures detected by a calibrated 0.5 mm PVDF needle hydrophone across depths z = 2.0 to 12.0 cm. Linear decibel attenuation slope α_u = 1.8500 dB/cm.
Biomedical apparatus & physiological sensors.
3.5 MHz Single-Element Focused Ultrasound Transducer
Generates standardized diagnostic ultrasound acoustic pulses with center frequency 3.50 MHz.
Calibrated 0.5 mm PVDF Needle Hydrophone (Precision Acoustics)
Detects high-frequency acoustic pressure waveforms from 1 to 20 MHz with broad flat bandwidth.
Standardized Tissue-Mimicking Ultrasonic Phantom (CIRS)
Provides certified acoustic properties (c = 1540 m/s, backscatter -40 dB) with calibrated depth steps.
High-Voltage Ultrasound Pulser-Receiver (Olympus 5077PR)
Energizes transducer with fast 200 V negative spike pulses and provides low-noise RF preamplification.
High-Speed 14-Bit RF Digitizing Oscilloscope (200 MS/s)
Digitizes raw radiofrequency (RF) acoustic A-lines with 200 megasamples/sec sampling rate.
FOLLOW THE METHOD
A reason behind every step.
Determine the acoustic attenuation coefficient α_u of a tissue-mimicking phantom in an automated ultrasound test tank across depths using a calibrated PVDF needle hydrophone. Standardized parameter settings: 2.0, 4.0, 6.0, 8.0, 10.0, 12.0 cm.
01
Water Tank Degassing and Hydrophone Alignment
Fill test tank with degassed deionized water (dissolved O₂ < 4 ppm) and align transducer acoustic axis with PVDF needle hydrophone tip using pulse-echo reflections.
02
Acoustic Centerline Spatial Alignment
Scan the hydrophone across orthogonal x-y planes to identify the maximum acoustic pressure axis, aligning coordinate z with the beam propagation path.
03
Reference Free-Field Intensity Calibration
Record baseline peak-to-peak acoustic pressure P_0 in pure degassed water at focal distance (z = 0) as reference unattenuated intensity.
04
Tissue Phantom Insertion and Depth Positioning
Position calibrated tissue-mimicking phantom blocks between transducer and hydrophone, setting initial tissue path length z = 2.0 cm.
05
Radiofrequency A-Line Capture and Filtering
Record 100 averaged RF acoustic A-line waveforms, calculate root-mean-square acoustic pressure P(z), and compute decibel attenuation A_db = 20 · log₁₀(P_0 / P).
06
Axial Depth Progression Sequence
Increment phantom thickness through 4.0, 6.0, 8.0, 10.0, and 12.0 cm, recording stabilized decibel attenuation A_db at each step.
07
Attenuation Coefficient Linear Regression
Plot decibel attenuation A_db versus axial depth z and extract acoustic attenuation coefficient α_u from the slope of the linear fit through the origin.
YOUR NOTEBOOK · 0 OBSERVATIONS
Turn measurements into biomedical engineering insight.
Points are your recorded observations. The solid regression line validates Ultrasound Acoustic Attenuation mathematical scaling.
LINEAR REGRESSION FIT · y = mx + b
A_db = α_u · z = 1.8500 · z (at 3.5 MHz ultrasound center frequency)
| # | Phantom Axial Depth z (cm) | Acoustic Signal Attenuation A_db (dB) | Axial depth z (cm) | Acoustic attenuation A_db (dB) | Remove |
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