high frequency vs low frequency ultrasound
Jan 12 2021 4:42 AM

2008;54(1):57–60. High frequency sound and even ultrasound in the lower frequency zone (up to 24 kHz) can be audible if the sound level is high enough. 6. Recently, a “high frequency” contact 20 MHz probe has been introduced. In recent years, in a randomized control clinical trial,17 ultrasound therapy was utilized in the management of chronic wounds. Outcomes of both methods of ultrasound therapy were better than standard care alone, and some differences between the two ultrasound therapy groups were observed, but they were not statistically significant. This randomized clinical trial (RCT) compared healing efficacy and safety of standardized venous ulcer compression with or without HF ultrasound or NCLF ultrasound. Therefore, high-frequency ultrasound provides high resolution of shallow structures. 2001;44(3):401–421. Parsa H, Zangivand AA, Hajimaghsoudi L. The effect of pentoxifylline on chronic venous ulcers. Edema at first clinic visit ranged from 1+ to 4+ in all groups: 10 patients in the standard treatment group, 12 patients in the HFU group, and nine patients in the NCLFU group had 1+ plus edema; seven patients in the standard treatment group, three patients in the HFU group, and eight patients in the NCLFU group had 4+. High frequency sound and even ultrasound in the lower frequency zone (up to 24 kHz) can be audible if the sound level is high … 2012;11:CD000265. 2014 Dec;11(6):586-93. Arch Med Sci. 2011;128(5):498e–503e. 32. Low Frequency Ultrasound Therapy for Wound Management 13. Sound waves with frequency over the human audible frequency range are called ultrasound. 3 This neglects the anterior region which accounts for 20%-30% of all prostate cancers. 2007;13(6):258–263. The authors concluded the proportion of wounds healed in the active ultrasound therapy device group was significantly higher than in the control group (40.7 % versus 14.3 %, P = 0.0366, Fisher’s exact test). In 2008, high-intensity focused ultrasound (HIFU) was introduced as an aesthetic treatment to tighten, reduce wrinkles, and lift the skin on the face and neck. 2005;44(6):449–456. Philadelphia, PA: Saunders;2003:349–351,356–359. 34. A pilot study evaluating non-contact low-frequency ultrasound and underlying molecular mechanism on diabetic foot ulcers. Wound pain decreased significantly in ultrasound-treated groups in comparison with standard treatment alone. Low Frequency Ultrasound and Noncontact Normothermic Wound Therapy 14. As such, the specialized protocol is designed to grade the 70%-80% of cancer that is located in the peripheral zone. (Remember that all waves in the same medium travel at the same speed). Busse JW, Bhandari M, Kulkarni AV, Tunks E. The effect of low-intensity pulsed ultrasound therapy on time to fracture healing: a meta-analysis. 8. 2007;97(2):95–101. Baronski S, Ayello EA. The searchable range (depth) and search area are dependent upon the frequency used. 3 This neglects the anterior region which accounts for 20%-30% of all prostate cancers. Therapeutic ultrasound for treating patellofemoral pain syndrome. Kavros SJ, Schenck EC. hard ultrasound = low frequency and high power used for destruction of tartar/calculus in dental practices; soft ultrasound = high frequency at very low power used in the case of Mira-Teeth; Ultrasound in medicine. Plast Reconstr Surg. Persons with rheumatoid arthritis, diabetes, or peripheral arterial disease as indicated by an ankle brachial pressure index (ABPI) <0.8 confirmed by Doppler ultrasound and signs of arterial disease such as ulcers with a “punched out” appearance base of wound poorly perfused, pale, dry, and cold legs/feet (in a warm environment), shiny, taut skin dependent rubor, pale or blue feet, and gangrenous toes also were excluded. Electrical stimulation therapy increases rate of healing of pressure ulcers in community-dwelling people with spinal cord injury. High frequency X-Ray machines use high frequency x-ray generators which are better than conventional single-phase generators due to efficient generation and control of high voltage power required to drive the x-ray tube. 2008;23(4):178–183. At the first visit, the mean pain scores in the standard treatment, HFU, and NCLFU groups were 6.20 (SD 1.64), 6.00 (SD 1.59), and 6.16 (SD 1.51) respectively (P = 0.58). Watson JM, Kang’ombe AR, Soares MO, et al. Study protocol. Weekly administration of low dose, high frequency ultrasound therapy (0.5 W/cm(2), 1 MHz, pulsed pattern of 1:4) for up to 12 weeks plus standard care compared with standard care alone. 2005;20(2):1–3. Ultrasound at low frequencies such as 10 MHz penetrates deeper into materials than ultrasound at higher frequencies, but the spatial resolution of the acoustic image is less. When a wavelength is really short (such as the frequencies at the higher end of the spectrum), the waveform is so tiny that it can become easily distorted. A wound assessment only was completed after 1 month, and all variables were assessed at the start of the study and after 2 and 4 months of treatment. In: Cameron MH. 2 Thoughts to “Improving outcomes with noncontact low-frequency ultrasound” Lori Sorrentino. Kibler WB, Duerler K. Electrical stimulation and application of heat. 2008;17:77–83. 13. Patients. 2001;(4):CD003375. Any sound with a frequency below the audible range of hearing (i.e., less than 20 Hz) is known as an infrasound and any sound with a frequency above the audible range of hearing (i.e., more than 20 000 Hz) is known as an ultrasound. Data collection. Potential Conflicts of Interest: none disclosed, Venous leg ulcers (VLUs) are a frequent and persistent challenge in clinical wound care. Ultrasound may be produced by applying a voltage to a piezoelectric crystal. Blue Cross Blue Shield Association. J Wound Ostomy Continence Nurs. Int Wound J. Int Wound J. High frequency sound is sound of which the frequency lies between 8 and 20 kHz. Compression for venous leg ulcers. CMAJ. 2013;59(8):14‚20. HFU delivers high-intensity (0.5–1 W/cm2), high-frequency (1–3 MHz) ultrasound for 5 to 10 minutes; and NCLFU delivers low-intensity (0.1–0.8 W/cm2), low-frequency (40 kHz) ultrasound for 4–10 minutes. All patients were given standard written and verbal advice to elevate the affected leg and to exercise. Continuous ulcer pain was assessed using a numerical rating scale in which the patient was instructed to choose a number from 0 for no pain to 20 for unbearable pain.30 To assess leg edema,31 the investigator pressed a fingertip against a bony prominence for 5 seconds and then removed it. 2007;20(4):221–226. J Wound Ostomy Continence Nurs. Ostomy Wound Manage. Differences in the amount of edema and pain rating scores were also significant at the 4-month, follow-up visit (P <0.05). Wound treatment option. Kavros SJ, Schenck EC. 33. In this prospective, comparative clinical study, the effect of standard ulcer care alone was compared with high-frequency ultrasound and noncontact ultrasound therapy in the treatment of VLUs, and the two modes of ultrasound therapy also were compared. 14. Mean pain scores decreased from 8.07 ± 1.91 pretreatment to 1.67 ± 1.76 post-treatment (P = 0.0003). The product’s recommended treatment algorithm is to apply in a manner similar to HFU and is based on longer treatment times for greater total ulcer area. Valencia IC, Falabella A, Kirsner RS, Eaglstein WH. For example, gamma waves have high frequency and high penetrating power: intuitively I imagined this as attacking a target rapidly in quick succession and managing to get through. The purpose of this study was to evaluate the effectiveness of HFU and NCLFU therapy compared to standard care in patients with VLUs. Wound size, wound pain, and lower leg edema were assessed at baseline and after 2 and 4 months. The linear array probe is designed for high-resolution imaging of superficial 5. Background/aims: B-scan ultrasonography is an invaluable, versatile, non-invasive tool in ophthalmology. After 4 months of treatment, the average ulcer sizes were 4.28 cm2 (SD 2.80), 3.23 cm2 (SD 2.39), and 2.72 cm2 (SD 2.16) cm2 in the standard, HFU, and NCFLU groups respectively (P = 0.04, see Table 2). After 4 months, eight patients in the standard treatment group, 24 patients in the HFU group, and 22 patients in the NCLFU group had 1+ edema and five patients in the standard treatment group, one patient in the HFU group, and four patients in NCLFU group had 4+ edema. Averages and standard deviations were computed for continuous data; P <0.05 was considered significant. The use of therapeutic ultrasound in venous leg ulcers: a randomized, controlled clinical trial. 2008 Sep;21(9):416-23. With current increases in longevity, including among persons with various wound types, VLUs are expected to place a great burden on healthcare systems.29 Controlling the previously described conditions and reining in costs of care will require the identification of accurate and appropriate strategies. The amplitude and intensity of ultrasound waves decrease as they travel through tissue, a phenomenon known as attenuation. Humans. These are sound waves that have a frequency of 20 kHz and above. Kavros SJ, Liedl DA, Boon AJ, et al. Rheumatology (Oxford). BMJ. The high-frequency ultrasound had a significantly higher positive rate of detecting nodules than the low-frequency ultrasound (61.67% vs. 27.31%; χ2=49.96, P<0.01), and the positive rates were positively correlated with liver fibrosis stage (low-frequency: r=0.5437; high-frequency: r=0.3021). Ennis WJ, Valdes W, Gainer M, Meneses P. Evaluation of clinical effectiveness of MIST ultrasound therapy for the healing of chronic wounds. 2011;19(4):475–480. Standard wound care. dependence of magnetization (proton density, field strength and temperature), effect of gradient strength and bandwidth on slice thickness, longitudinal and transverse magnetization, molecular tumbling rate effects on T1 and T2. Taradaj J, Franek A, Brzezinska-Wcislo L, Cierpka L, Dolibog P, Chmielewska D, et al. However, high-frequency waves are more attenuated than lower frequency waves for a given distance; thus, they are suitable for imaging mainly superficial structures (2-3cm from skin). Ennis WJ, Foremann P, Mozen N, Massey J, Conner-Kerr T, Meneses P. Ultrasound therapy for recalcitrant diabetic foot ulcers: results of a randomized, double-blind, controlled, multicenter study. 2004;31(2):65-71. 3. Although high-frequency ultrasound (HFU) (1–3 MHz) has been used in clinical practice in most studies and has been shown to promote healing in some injuries,18-21 according to results of randomized, controlled, clinical trials,18,19,22 heat from this electrical devise can cause hot spots, burns, or endothelial injury; as such, use is limited in medical practice. Current management of venous ulcers: an evidence-based review. Generation of ultrasound. Unlike its low frequency precursor, micro-ultrasound struggles with the phenomena of signal loss deep in the anterior, especially with larger prostates. Etufugh CN, Phillips TJ. Cameron MH. But the penetrating ability is also a feature of low frequency waves - the usual telecommunications spectrum. For example, gamma waves have high frequency and high penetrating power: intuitively I imagined this as attacking a target rapidly in quick succession and managing to get through. Ultrasound frequencies in diagnostic radiology range from 2 MHz to approximately 15 MHz. Lawson D and Petrofsky JS. 10. Therapeutic ultrasound in soft tissue lesions (Review). As such, the specialized protocol is designed to grade the 70%-80% of cancer that is located in the peripheral zone. Shorten the time delay between pulses, and the wavelength gets shorter. A residual indentation indicated pitting edema, which was graded on a scale of 1 (mild) to 4 (severe). Please address correspondence to: Azadeh Garkaz, MD, Department of Radiology, Zahedan University of Medical Sciences, Zahedan, Iran; email:garkaz13025@gmail.com. Ostomy Wound Manage. Investigators documented patient demographic information; medical, surgical, and leg ulcer history; and a detailed wound description. Vowden KR, Vowden P. Preventing venous ulcer recurrence: a review. Earthquakes have very low frequencies; ultrasound waves have very high frequencies. Driver VR, Yao M, Miller CJ. Technol Eval Cent Asses Program Exec Summ. It is important to remember that higher frequencies of ultrasound have shorter wavelengths and are absorbed/attenuated more easily. The device consists of a unit with a transducer, generator, and disposable applicator that uses prepackaged sterile saline. 37. Physical Agents in Rehabilitation: From Research to Practice, 2nd ed. Dolphins can produce sound waves with frequencies ranging from 0.25 kHz to 220 kHz, but only those at the upper end of this spectrum are used in echolocation. The amplitude and intensity of ultrasound waves decrease as they travel through tissue, a phenomenon known as attenuation.Given a fixed propagation distance, attenuation affects high frequency ultrasound waves to a greater degree than lower frequency waves. WOUNDS. Another open-label, nonrandomized, baseline-controlled clinical case series study analysis (N = 51) by Kavros et al36 indicated healing time reductions (9.8 ± 5.5 weeks versus 5.5 ± 2.8 weeks [P <0.0001]) and wound volume percent improvement (37.3% ± 18.6% versus 94.9% ± 9.8% [P <0.0001]) when NCLFU therapy was compared to the clinic’s standard care. Medical ultrasound transducers contain more than one operating frequency. O’Meara S, Cullum N, Nelson EA, Dumville JC. Searchable area is determined by the frequency of the ultrasound used. J Am Acad Dermatol. Explain why high-frequency waves work better than low-frequency waves. Use of weekly, low dose, high frequency ultrasound for hard to heal venous leg ulcers: the VenUS III randomised controlled trial. Humans are not alone in their ability to detect a wide range of frequencies. The mean decrease in pain scores was significantly different after the 4-month visit among the three groups. Although the average age of patients in the current study was slightly lower than other studies in world, this could be due to the higher prevalence of the disease in Iran, especially considering a similar study conducted by Parsa et al38 involving patients of similar age range. It is a non-invasive treatment used to lift and tighten loose skin on areas such as the eyebrows, jawline, neck and jowls, as well as improving wrinkles. 20. At this visit, the mean pain scores in the standard treatment, HFU, and NCLFU groups were 5.10 (SD 1.88), 3.96 (SD 2.88), and 3.26 (SD 3.06) respectively (P = 0.02; see Table 4). 2001;92(1-2):173–186. I am a clinician-RN in a LTC facility and am researching for ways to better serve and to find alternatives to chronic wounds. Ultherapy Ultherapy uses ultrasound energy to heat targeted tissue under the surface of the skin, triggering the natural production of collagen. 19. Aust NZ J Surg. Check for errors and try again. Brodovicz KG, McNaughton K, Uemura N, Meininger G, Girman CJ, Yale SH. Franco de Oliveira R, Pires Oliveira DA, Soares CP. HFU therapy was applied with a SoLo Therasonic 355 machine (EMS Physio, Wantage, UK). When operating an ultrasound system, then, it is prudent to select a transducer with the appropriate frequency for … Speed CA. Statistical analysis. 2008;35(6):579–583. 1995;4(2):57–61. 1978;4(4):343–351. All enrolled patients provided written informed consent. 2011;7(2):224–229. All groups received standard wound care three times per week for 3 months or until healing. Ultrasound may be produced by applying a voltage to a piezoelectric crystal, and ulcer... This device delivers high-intensity ( 0.5–1 W/cm2 ), high-frequency ( 1–3 MHz ) ultrasound kavros SJ, Liedl,... Months treatment and above frequencies of ultrasound have shorter wavelengths and are absorbed/attenuated more easily 1.80! Verbal advice to elevate the affected leg and to exercise Harris C, Rudolph T, Valencia,. 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