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image - Coggle Diagram
IMAGING TECHNIQUE
B
REAL TIME
Frame Rate
Temporal Resolution
STATIC
M
A
Time Gain Compensator
Deph
Overall
Master clock
DOPPLER
CONTINUOUS
Avarage info
2 PZT
PULSED
Time base Gating
Deph Measure
Maximum Detectable Velocity
FILTERING
Tissue
Blood
SIGNAL ANALYSIS
Listening
Analog signal
Signal Spectrum
HARMONIC IMAGING
Clutter noise
SPL
Bandwidth
Side Lobes
Non linear propagation
DUPLEX
PARAMETERS
Pulse Duration
Spatial Pulse Length
AXIAL RESOLUTION
Pulse Repetition Freq
MAXIMUM DEPH
Duty Factor
Near Field Length
LATERAL RESOLUTION
SYSTEM
MATCHING
Layer
Reverberation λ/4
rad(Zpzt * Z tissue)
Epoxy Alluminium Powder
Gel
BACKING
Softening
PZT
λ/2
Lead Zirconium Titanium
FOCUSING
Mirrors
Lenses
Electronic
ARTEFACTS
Enhancement
LOW attenuation
Shadowing
HIGHER attenuation
Range Error
No costant speed
Reverberation
Multiple reflections
Position Error
Refraction
PHYSICS
REFLECTION
Foundamental Equations
IMPEDANCE
ACUSTIC WAVE
Soft tissues
Non invasive
Non ionizing
RESOLUTION & PENETRATION
SCANNERS
CURILINEAR
steering not needed
Decreasing lateral resolution
CIRCULAR/RING
Electronic focusing ELEVATION + AZIMUTH
no lateral lobes
LINEAR SEQUENTIAL
128-500
Rectangular
8-16 initialized
Electronic focusing AZIMUTH
PHASED
Steering + Focusing AZIMUTH
128
MECHANICAL
Moving part
1.5D MATRIX
steering AZIMUTH
focusing AZIMUTH + ELEVATION
2D MATRIX
steering & focusing AZIMUTH & ELEVATION
3D image
INTERACTIONS
DIFFUSION
Raleigh Scattering
Increase with f4
Mie Scattering
Specular Diffusion
REFRACTION
Snell's Law
ABSORBPTION
Half Value
0.8 dB/cm*MHz
DIFFRACTION
REFL & TRANSM COEFF
