GE Ultrasound

1
When Sound Travels through Tissue...
High Pressure gt Tissue compressed gt
Higher velocity
Low Pressure gt Tissue expanded gt Lower
velocity
2
Progressive Sound Wave Distortion
Pure Tone
Increasing Harmonics
CDC
C1.5 km/s
C-DC
direction of propagation
3
General Benefits
Haze
4
Physical Origin of Tissue Harmonics
Sound Propagation in Tissue
Sound Wave Distortion
Tissue Harmonics
5
Coded Harmonics
Basic Harmonics

• Step 1

Transmit
2
5
MHz
Step 2
Receive
4
10
2
5
7
4
2
5
6
Coded Harmonics M12L example
7
THI Review
2nd Harmonics gt
Transmit at fo Receive at 2fo
Physical Origin gt
Sound Propagation in Tissue
Reduced Haze, Improved Cystic Clearing
General Benefits gt
Coded Harmonics gt
Improved Resolution Sensitivity