effects of different ultrasound frequencies on the


Jul 27 2017Side Effects Despite its medicinal and therapeutic benefits there are some side effects to be aware of with ultrasonic therapy Indeed the general practice of ultrasound therapy is regarded as safe and effective but there have been some minor cases of physical pain due to cavitation

Effects of different ultrasound frequencies on the

1 Introduction As a new non-heat treatment technology ultrasound has been widely studied and applied because of its large amount of advantages (e g green pollution-free and high efficiency) According to its frequency and intensity ultrasound can be roughly divided into two categories: high frequency low intensity ultrasound and low frequency high intensity ultrasound

Ultrasound in Wound Healing

Therapeutic ultrasound is utilized by physical therapists to deliver a high frequency mechanical vibration to facilitate healing at a cellular level Therapeutic ultrasound is often used by physiotherapists to reduce pain increase circulation and increase mobility of soft tissues Additionally the application of ultrasound can be helpful in the reduction of inflammation reducing pain and


Ultrasonics vibrations of frequencies greater than the upper limit of the audible range for humans—that is greater than about 20 kilohertz The term sonic is applied to ultrasound waves of very high amplitudes Hypersound sometimes called praetersound or microsound is sound waves of frequencies greater than 10 13 hertz At such high frequencies it is very difficult for a sound wave to

Significance of U/S probe frequency

Ultrasound waves have frequencies that exceed the upper limit for audible human hearing i e greater than 20 kHz Medical ultrasound devices use sound waves in the range of 1–20 MHz Proper selection of transducer frequency is an important concept for providing optimal image resolution in diagnostic and procedural Ultrasound

Review of Therapeutic Ultrasound: Effectiveness Studies

Jul 01 2001Ultrasound is widely used in many countries including Canada 1 Australia 2– 4 Denmark 5 Finland 6 New Zealand 7 Switzerland 8 the United Kingdom 9 10 and the United States 11 Physical therapists have given many reasons for using ultrasound such as for the "physiological effects" or because of beliefs in "clinical results" 4

The effect of different frequencies of ultrasound on the

T D ACCEPTED MANUSCRIPT 1 1 The Effect of Different Frequencies of Ultrasound on the Activity of 2 Horseradish Peroxidase 3 Konstantina Tsikrika Boon-Seang Chu David H Bremner and M Adlia Lemos 4 School of Science Engineering Technology Abertay University Dundee DD1 5 1HG UK 6 Abstract 7 Ultrasound technology has been studied by food researchers as an alternative


Attenuation coefficients are used to quantify different media according to how strongly the transmitted ultrasound amplitude decreases as a function of frequency The attenuation coefficient can be used to determine total attenuation in dB in the medium using the following formula: = [⋅] ⋅ [] ⋅ [] Attenuation is linearly dependent on the medium length and attenuation coefficient as well

New ultrasound treatment kills off cancer cells

The team tested different ultrasound frequencies (ranging from 300 000 to 650 000 hertz) They also tested different pulse durations (from 2 to 40 milliseconds) One minute of 500 000 hertz ultrasound delivered in 20-millisecond bursts killed nearly every cancer cell It didn't hurt the blood cells

Ultrasound transducer

An ultrasound transducer converts electrical energy into mechanical (sound) energy and back again based on the piezoelectric effect It is the hand-held part of the ultrasound machine that is responsible for the production and detection of ultrasound waves It consists of five main components:

Effect of Different Ultrasound Frequency Sweep Pattern on

mechanical and biological effects induced by different sonication condition submitting U937 cells at various sweep frequencies and at fixed frequencies with different burst rate The cells were stressed by pulse wave ultrasound with increasing and decreasing frequency between 400 and 620 KHz at 0 5 Hz 10 Hz 50 Hz burst rate and 50 % duty


the different sources that produce this phenomenon Physiological effects of low frequencies are shown as well as some of the uses that mankind is giving to this lower part of the frequency spectrum Limitations to exposure are presented briefly in order to understand that this

Ultrasound Transducer Selection in Clinical Imaging Practice

The frequency range or bandwidth 1 2 6 of the transducer will determine whether it can support B‐mode imaging at different center frequencies and also operate in Doppler harmonic and color flow modes With Doppler‐based imaging modes we often need to operate with lower frequencies than the B‐mode frequency to minimize aliasing

Ultrasound – Knowledge for medical students and physicians

Ultrasound is a radiological technique that involves sending soundwaves with very high frequencies (∼ 2–20 MHz for diagnostic imaging) through the body and receiving their echoes to visualize internal structures and organs The soundwaves are produced by piezoelectric transducers encased in a probe that also detects the echoes The denser a material is the stronger the echo and

The effects of ultrasound on different tissue types

The effects of ultrasound on different tissue types Google Classroom Facebook Twitter Email Chemical and physical sciences practice passage questions Practice: Understanding cardiac pressure-volume curves Practice: Imaging tissue structures using muon tomography

Potential Adverse Ultrasound

The potential for ultrasound to produce biologic effects was first reported in 1917 Langevin demonstrated that fish in a small tank died when exposed to ultrasound 5 Subsequent studies confirmed that ultrasound also produces damage in other species 6 The thermal effects of ultrasound were used in the 1940s to cauterize tissue during surgery and to destroy cancerous cells in situ 7 8 Fry et

Effect of Frequency on Ultrasonic Atomization

Effect of Frequency on Ultrasonic Atomization change for ultrasound is higher than that for pump at same flow rate of carrier gas since the mass change for ultrasound includes atomized droplet and vapor from fountain It is assumed that the mass change difference between ultrasound and

Effects of Ultrasound Technique on the Composition of

The objective of the experiment was to investigate the stability of the composition of selected essential oils in the model systems containing methanol and hexane solutions which were treated with ultrasound Solutions of the oils with a concentration of 90 mg/ml were subjected to the effect of ultrasounds with a frequency of 20 kHz and an output power of 200#x2009 W for periods of 2#x2009

The effect of different frequencies of ultrasound on the

The use of ultrasound as a way to inactivate and/or activate enzymes has been widely studied at low frequencies (20–40 kHz) however little research on the effect of high frequencies has been reported Thus the effect of high and low frequency ultrasound on commercial horseradish peroxidase with a concentration of 0 005 mg mL−1 is described


The ultrasound unit and transducer creates sound waves that penetrate tissues of the body and causes vibrations of the molecules within the tissues receiving the sound waves Therapist can manipulate frequency duty cycle dosage treatment duration and treatment area to achieve different outcomes such as non-thermal and thermal ultrasound

Histologic effects of external ultrasound

This study aimed to observe the effects of ultrasound waves at different frequencies on abdominal fat tissue External ultrasound-assisted lipectomy (XUAL) via both histologic and immunohistochemic examinations was used to assess adipose tissue alterations including cells and collagenic fibers

Experimental Investigation on the Effects of Audible Sound

ultrasound waves between 6 kHz to 40 kHz can induce colony formation of Bacillus carbophilus grown on non-permissive media In this paper the effect of audible sound of certain frequencies to E coli is investigated as a compliment to the application of ultrasound The effect is assessed based on the comparison in their cell number