high frequency vs low frequency ultrasound

Phelebology. Brosseau L, Casimiro L, Robinson V, Milne S, Shea B, Judd M, et al. Humans are not alone in their ability to detect a wide range of frequencies. The statistical evaluation was performed by computer analysis using SPSS Software (Statistical Package for the Social Sciences, version 16.0, SPSS Inc, Chicago, IL). A high frequency wave with a short pulse length will yield better axial resolution than a low frequency wave. Hard ultrasound vs. soft ultrasound Mira-Teeth uses soft ultrasound to deep clean teeth & gums 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 2001;(4):CD003375. 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. Powerful low-frequency probes are required for imaging at greater depths, although the resulting image may not have the fine detail of one produced at higher frequencies. Pain assessment in cognitively impaired and unimpaired older adults: a comparison of four scales. Although current results confirm the efficacy of ultrasound in VLU treatment, numerous studies published in recent years reported conflicting results regarding the effectiveness of ultrasound. Although this method is scientifically valid and reliable, use of more precise imaging and histopathological assessment methods may have enhanced study accuracy. 2005;20(2):1–3. 2006;19(8):437–446. Unable to process the form. Cochrane Database Syst Rev. Due to this ultrasound cannot travel for long distances or through objects, they are easily attenuated. 24. High frequency sound is sound of which the frequency lies between 8 and 20 kHz. While use of low frequency beams (50 kHz) facilitates a search of wider area, use of high frequency beams (200 kHz) allows the operator to narrow down the search area to detect the more precise location of a fish school. Ultherapy Ultherapy uses ultrasound energy to heat targeted tissue under the surface of the skin, triggering the natural production of collagen. 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. Physical Agents in Rehabilitation: From Research to Practice, 2nd ed. 18. Comparing NCLFU and HFU treatment is an initial step to settling debatable issues. 6. 13. A high frequency wave with a short pulse length will yield better axial resolution than a low frequency wave. 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. This explains why high frequencies are used for the superficial body structures and low frequencies are used for those that are deeper. Olyaie M, Rad FS, Elahifar MA, et al. The following frequencies are a guide to frequencies typically used for … Changes in venous refilling time from childhood to adulthood in subjects with apparently normal veins. Technol Eval Cent Asses Program Exec Summ. 15. 2001;44(3):401–421. 2001;92(1-2):173–186. For example, 30 Hz (low frequency) has a wavelength of 10,000 km (over 6,000 miles) while 300 GHz (high frequency) is just 1 mm. 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. 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). Ultimately, 90 patients with VLUs (47 men and 43 women, age 38.3 [SD 11.5] years) provided informed consent and participated in the study. Int Wound J. 2005;44(6):449–456. Low-frequency, noncontact, nonthermal ultrasound therapy: a review of the literature. NCLFU therapy was applied with a Celleration MIST Therapy™ System 5.1 (Celleration, Inc, Eden Prairie, MN). Ostomy Wound Manage. Please address correspondence to: Azadeh Garkaz, MD, Department of Radiology, Zahedan University of Medical Sciences, Zahedan, Iran; email:garkaz13025@gmail.com. The study was approved by the ethics committee of the university before its initiation, and the protocols used conformed to the ethical guidelines of the 1975 Helsinki Declaration. But the penetrating ability is also a feature of low frequency waves - the usual telecommunications spectrum. HMP. 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. The applicator contains a valve that controls the flow of saline to the transducer surface. Ultrasound frequencies in diagnostic radiology range from 2 MHz to approximately 15 MHz. J Wound Ostomy Continence Nurs. Wound-healing outcomes using standardized assessment and care in clinical practice. Stücker M, Reich S, Robak-Pawelczyk B, Moll C, Rudolph T, Altmeyer PJ, et al. So in terms of aesthetic facial rejuvenation, RF has been around much longer. Cochrane Database Syst Rev. 2011;19(4):475–480. On the other hand, ultrasound at very high frequencies do not penetrate deeply, but provide acoustic images having very high resolution. 2014 Dec;11(6):586-93. Noncontact low-frequency ultrasound therapy in the treatment of chronic wounds: a meta-analysis. Neurology India. Averages and standard deviations were computed for continuous data; P <0.05 was considered significant. 10. Sound waves with frequency over the human audible frequency range are called ultrasound. 12. 37. Ramundo J, Gray M. Is ultrasonic mist therapy effective for debriding chronic wounds? The exact frequency of either of those treatments will depend on the type of device used and your skin conditions such as its current elasticity or your genetic heritage. 29. Watson JM, Kang’ombe AR, Soares MO, Chuang LH, Worthy G, Bland JM, et al. 2002;166(4):437–441. 34. However, these waves lose energy more rapidly, preventing deep penetration. Suissa D, Danino A, Nikolis A. Negative-pressure therapy versus standard wound care: a meta-analysis of randomized trials. Low Frequency Ultrasound and Noncontact Normothermic Wound Therapy 14. The linear array probe is designed for high-resolution imaging of superficial 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. DeLee & Drez’s Orthopaedic Sports Medicine: Principles and Practice, 2nd ed. High frequency sound with a frequency over 16 kHz can hardly be heard, but it is not completely inaudible. Noncontact low-frequency ultrasound therapy in the 38. 23. 2008 Sep;21(9):416-23. In figure A, a 5 MHz transducer generates ultrasound waves that travel 0.3 mm per cycle (wavelength = 0.3 mm = speed of sound / frequency = 1,540 m/sec divided by 5 x 106 cycles/sec). 39. … 2004;31(2):65-71. Watson JM, Kang’ombe AR, Soares MO, et al. The upper frequency limit in humans (approximately 20 kHz) is due to limitations of the middle ear. Humans. Venous ulcers. A systematic review9 of 48 randomized controlled trials (4,321 participants in total) showed high-compression bandaging is an effective treatment that reduces edema, reverses venous hypertension, and improves calf muscle pump function. All wounds were healed after an average of 8.50 (SD 2.17), 6.86 (SD 2.04), and 6.65 (SD 1.59) months in the standard treatment, HFU, and NCLFU groups, respectively (P = 0.001). Ultherapy Ultherapy uses ultrasound energy to heat targeted tissue under the surface of the skin, triggering the natural production of collagen. 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. Arch Med Sci. Wound surface was measured by tracing the margins of the open wound and measuring the two maximum perpendicular axes (length x width).32 Local findings and side effects were recorded after each treatment and in monthly visits. Brodovicz KG, McNaughton K, Uemura N, Meininger G, Girman CJ, Yale SH. Dolphin echolocation is similar to ultrasound. Feng et al. Kavros SJ, Liedl DA, Boon AJ, et al. Expedited wound healing with noncontact, low- In a retrospective study, Gehling and Samies37 assessed the pain scores of 15 consecutive patients (seven men, eight women, age range 28–88 years) with painful, nonhealing, lower-extremity wounds treated for 2 to 4 weeks with NCLFU therapy. Initial wound measurements were 9.60 cm2 (SD 5.54), 9.86 cm2 (SD 3.95), and 10.01 cm2 (SD 4.58) for the standard treatment, HFU, and NCLFU groups, respectively; after 4 months, measurements were 4.28 cm2 (SD 2.80), 3.23 cm2 (SD 2.39), and 2.72 cm2 (SD 2.16), a statically significant difference (P = 0.04). 13. Sound waves with frequency over the human audible frequency range are called ultrasound. Ostomy Wound Manage. Cart based or mobile ultrasound systems are more commonly used for hospital use. Low Frequency Ultrasound Therapy for Wound Management Page 4 of 5 12. 31. No previous study compares NCLFU and HFU therapy in VLU treatment. Ultrasound is short waves with low energy. St. Louis, MO: Saunders:2003:133–259. 32. There is, as with other waves, a frequency of the compression and rarefaction. Reflected sound waves allow a dolphin to form an image of the object that reflected the waves. 2001;40(12):1331–1336. There is, as with other waves, a frequency of the compression and rarefaction. I am a clinician-RN in a LTC facility and am researching for ways to better serve and to find alternatives to chronic wounds. 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. Generation of ultrasound. Ultrasound has a frequency higher than this and in medicine the frequencies range from 1MHz to 15MHz. Ulcers <5 cm2 in area received ultrasound for 5 minutes; ulcers 10 cm2 in area received 10 minutes of ultrasound. Demographic patient variables and clinical characteristics did not differ significantly among the three study groups, each with 30 patients (see Table 1). 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. Searchable area is determined by the frequency of the ultrasound used. 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. Stacey MC, Burnand KG, Layer GT, Pattison M, Browse NL. 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. Than this and in medicine the frequencies range from 2 MHz to approximately 15 MHz Celleration,,. Iran and elsewhere generates fewer waves, a phenomenon known as attenuation: the VenUS randomised. De Oliveira R, Pires Oliveira DA, Boon AJ, et al targeted under... Reliable results, more controlled clinical trial chronic wound pain: a meta-analysis of trials. 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