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DIGEST Guidelines - Shockwave Therapy

2 DIGEST Guidelines To the Extracorporeal Shock Wave Therapy Updated 05/2019 Table of Contents 1 Physics and Technology of ESWT Dr. Vinzenz Auesperg p. 03 2 Practical Application Tendopathies Upper Extremities Tendinosis calcarea Radial epicondylopathy Ulnare epicondylopathy Morbus Dupuytren Prof. Dr. Ludger Gerdesmeyer Sergej Thiele Sergej Thiele Prof. Dr. Karsten Knobloch p. 20 p. 26 p. 30 p. 33 Tendopathies Lower Extremities Trochanteric pain syndrome PD Dr. J rg Hausdorf p. 37 Plantar fasciitis Achilles tendon tendinopathy Patellar tip syndrome Tibial stress syndrome Hamstring tendinopathy Morbus Ledderhose PD Dr.

Transmission (transverse wave, longitudinal wave) (Partial) reflection Diffraction and / or deflection, scattering Wave velocity x density of the medium = acoustic impedance Pressure / tension wave, shear forces

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Reflection and transmission ! Acoustic impedance : Z=ρc ! ρ: density, c : sound velocity Z 1 Z 2 θ i θ r θ t Incident wave Reflected wave Transmitted wave 2 1 sin sin c c t i = θ Snell’s law θ R p= Z 2cosθ i−Z 1cosθ t Z 2cosθ i+Z 1cosθ t T p= 2Z 2cosθ i Z 2cosθ i+Z 1cosθ t For sound pressure R p: reflectance, T p ...

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This means that perfect matching (total transmission and zero reflection) can be achieved even between widely different impedances if a quarter-wavelength matching layer of ZZZo = 12 acoustic impedance is applied at the interface. Let us denote the center frequency where the layer thickness equals to one quarter-wavelength by fo. In the ...

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Transmission loss (TL) of the muffler: W i W r W ... G Source impedance ... The sound pressure p and the particle velocity v are the acoustic state variables any acoustic component 1 2 p 1, u 1 p 2, u 2 For any passive, linear component: Transfer, transmission, or four-pole matrix

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A reflection is produced when an acoustic wave encounters a difference in acoustic impedance , so an ultrasound image may be thought of as a map of the relative variations in acoustic impedance in the tissues −1 ≤R≤1 A negative value of R implies that the reflected wave is inverted with respect to the incident wave Z is the acoustic impedance

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considering the acoustic impedance é ? of aluminum is around eleven times of that of water. A more careful analysis including elasticity of the solid suggested that at low frequency the majority of acoustic energy can be predominantly confined in the fluid, when such an excitation

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