Use of High-Resolution Ultrasound in Evaluation of the Forefoot to Differentiate Forefoot Nerve Entrapments

2005 ◽  
Vol 95 (5) ◽  
pp. 429-432 ◽  
Author(s):  
Brian R. Kincaid ◽  
Stephen L. Barrett
Keyword(s):  
High Resolution ◽  
Peripheral Nerves ◽  
Corticosteroid Injection ◽  
Nerve Entrapment ◽  
High Frequency Ultrasound ◽  
Forefoot Pain ◽  
Plantar Plate ◽  
Nerve Entrapments ◽  
Entrapment Syndromes ◽  
Frequency Ultrasound

Forefoot pain can have single or multiple etiologies, and frequently pain is attributed solely to a forefoot nerve entrapment. It is well known that forefoot nerve entrapments, such as Morton’s, can be falsely assumed to be the cause of forefoot pain when in fact other factors, such as plantar plate disturbances, are the true cause. Frequently, the cause of the patient’s forefoot pain starts as a forefoot nerve entrapment, but then, as a result of treatment with a corticosteroid injection, other pathologies manifest, such as plantar plate rupture. The development of high-resolution, high-frequency ultrasound scanners has opened the door to in-depth examination of peripheral nerves as well as small pericapsular and intracapsular joint structures of the foot and ankle. In the hands of an experienced clinician, ultrasound can play an important role in differentiating nerve lesions and entrapment syndromes from nonneurogenic pain generators, such as tendons, ligaments, fasciae, and joint capsules. The focus of this article is the forefoot, where differentiation of neuroma, neuritis, and capsulitis can be difficult. (J Am Podiatr Med Assoc 95(5): 429–432, 2005)

Intraocular Pressure–dependent Corneal Elasticity Measurement Using High-frequency Ultrasound

2019 ◽  
Vol 41 (5) ◽  
pp. 251-270 ◽  
Author(s):  
Laurentius O. Osapoetra ◽  
Dan M. Watson ◽  
Stephen A. McAleavey
Keyword(s):  
Intraocular Pressure ◽  
High Resolution ◽  
High Frequency ◽  
Wave Speed ◽  
Biomechanical Properties ◽  
Single Element ◽  
High Frequency Ultrasound ◽  
Spatially Resolved ◽  
Corneal Biomechanical Properties ◽  
Frequency Ultrasound

Measurement of corneal biomechanical properties can aid in predicting corneal responses to diseases and surgeries. For delineation of spatially resolved distribution of corneal elasticity, high-resolution elastography system is required. In this study, we demonstrate a high-resolution elastography system using high-frequency ultrasound for ex-vivo measurement of intraocular pressure (IOP)-dependent corneal wave speed. Tone bursts of 500 Hz vibrations were generated on the corneal surface using an electromagnetic shaker. A 35-MHz single-element transducer was used to track the resulting anti-symmetrical Lamb wave in the cornea. We acquired spatially resolved wave speed images of the cornea at IOPs of 7, 11, 15, 18, 22, and 29 mmHg. The IOP dependence of corneal wave speed is apparent from these images. Statistical analysis of measured wave speed as a function of IOP revealed a linear relation between wave speed and IOP cs = 0.37 + 0.22 × IOP, with the coefficient of determination R2 = 0.86. We also observed depth-dependent variations of wave speed in the cornea, decreasing from anterior toward posterior. This depth dependence is more pronounced at higher IOP values. This study demonstrates the potential of high-frequency ultrasound elastography in the characterization of spatially resolved corneal biomechanical properties.

High-Frequency and Ultra-High Frequency Ultrasound: Musculoskeletal Imaging up to 70 MHz

2020 ◽  
Vol 24 (02) ◽  
pp. 125-134 ◽  
Author(s):  
Domenico Albano ◽  
Giacomo Aringhieri ◽  
Carmelo Messina ◽  
Luca De Flaviis ◽  
Luca Maria Sconfienza
Keyword(s):  
High Frequency ◽  
Peripheral Nerves ◽  
Imaging Technique ◽  
Case Series ◽  
Image Resolution ◽  
Ultrastructural Changes ◽  
High Frequency Ultrasound ◽  
Ultra High Frequency ◽  
Time Dynamic ◽  
Frequency Ultrasound

AbstractMusculoskeletal (MSK) ultrasound has well-established advantages, able to investigate very small structures with high resolution and a quick and real-time dynamic evaluation with the possibility of contralateral comparison. Thus ultrasound has kept its own almost exclusive fields of application in daily clinical practice, and it is considered the first-level imaging technique to assess tendons, bursae, and capsuloligamentous structures of small peripheral joints as well as peripheral nerves. Up to now, however, clinical MSK ultrasound imaging could not go beyond the first 1 to 2 cm under the skin, using high-frequency probes up to 18 to 20 MHz with spatial resolution just below millimeters. We present the impressive technical advancements leading to image resolution as low as 30 µm using ultra-high frequency ultrasound (UHFUS) probes up to 70 MHz. High-frequency ultrasound and UHFUS, with frequencies ranging from 22 to 70 MHz, are promising tools to evaluate very superficial structures. In the MSK system, only two articles have assessed its value in limited case series. Future developments may be aimed to better assess ultrastructural changes of very superficial peripheral nerves and other thin structures such as pulleys, retinacula, and tendons.

Efficiency Control Cellulite Treatment Using High-Frequency Ultrasound Visualization of High Resolution

10.12737/5809 ◽  
2014 ◽  
Vol 8 (1) ◽  
pp. 1-2
Author(s):  
Белков ◽  
P. Belkov ◽  
Безуглый ◽  
A. Bezuglyy ◽  
Круглова ◽  
...  
Keyword(s):  
High Resolution ◽  
Human Skin ◽  
High Frequency ◽  
Subcutaneous Tissue ◽  
Control Group ◽  
Objective Data ◽  
High Frequency Ultrasound ◽  
Functional Parameters ◽  
Efficiency Control ◽  
Frequency Ultrasound

To describe ultrasonographic image of human skin with cellulite, the authors used high-frequency ultrasound visualization of the skin with a frequency of 22 MHz using a system DUB (tpm GmbH Germany). The skin on the thigh in 15 patients with cellulite and in 10 patients in the control group was examined. The differences in thickness and acoustic density of dermis and subcutaneous tissue between the group of patients with cellulite and in control were described. Objective data of high frequency ultrasound allow to quantify morphological and functional parameters of the skin in the dynamics and results of cellulite correction.

scholarly journals High-resolution ultrasonography in evaluating peripheral nerve entrapment and trauma

2009 ◽  
Vol 26 (2) ◽  
pp. E13 ◽  
Author(s):  
Ralph W. Koenig ◽  
Maria T. Pedro ◽  
Christian P. G. Heinen ◽  
Thomas Schmidt ◽  
Hans-Peter Richter ◽  
...  
Keyword(s):  
High Resolution ◽  
Peripheral Nerve ◽  
Peripheral Nerves ◽  
Imaging Modality ◽  
Nerve Entrapment ◽  
Nerve Lesions ◽  
Peripheral Nerve Lesions ◽  
Continuous Progress ◽  
Number Of Publications ◽  
High Resolution Ultrasonography

High-resolution ultrasonography is a noninvasive, readily applicable imaging modality, capable of depicting real-time static and dynamic morphological information concerning the peripheral nerves and their surrounding tissues. Continuous progress in ultrasonographic technology results in highly improved spatial and contrast resolution. Therefore, nerve imaging is possible to a fascicular level, and most peripheral nerves can now be depicted along their entire anatomical course. An increasing number of publications have evaluated the role of high-resolution ultrasonography in peripheral nerve diseases, especially in peripheral nerve entrapment. Ultrasonography has been shown to be a precious complementary tool for assessing peripheral nerve lesions with respect to their exact location, course, continuity, and extent in traumatic nerve lesions, and for assessing nerve entrapment and tumors. In this article, the authors discuss the basic technical considerations for using ultrasoniography in peripheral nerve assessment, and some of the clinical applications are illustrated.

High Frequency Ultrasound for High Resolution Skin Imaging

Frequenz ◽  
2001 ◽  
Vol 55 (1-2) ◽  
Author(s):  
Michael Vogt ◽  
Katharina Kaspar ◽  
Peter Altmeyer ◽  
Klaus Hoffmann ◽  
Stephan El Gammal
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
High Frequency Ultrasound ◽  
Skin Imaging ◽  
Frequency Ultrasound

scholarly journals New Diagnostic Techniques for Esophageal Disorders

2008 ◽  
Vol 22 (11) ◽  
pp. 903-908 ◽  
Author(s):  
A Lazarescu
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
Esophageal Motility ◽  
Diagnostic Techniques ◽  
Esophageal Motility Disorders ◽  
Esophageal Wall ◽  
High Frequency Ultrasound ◽  
Motility Disorders ◽  
Ph Metry ◽  
Frequency Ultrasound

Esophageal disorders are common in the general population and can be associated with significant morbidity. Several new diagnostic techniques for esophageal disorders have become available in recent years. These include capsule pH-metry, high-resolution manometry, impedance combined with either pH-metry or manometry, and high-frequency ultrasound. Capsule pH-metry is useful in children and in patients who cannot tolerate the conventional pH-metry catheter. It has the advantage of not interfering with a patient’s usual meals and activities during the 24 h study. High-resolution manometery is easier to perform and interpret than conventional manometry. This has led to improved diagnosis of various esophageal motility disorders. Impedance measures the movement of liquid and gas in the esophagus. When combined with pH-metry, impedance can confirm that retrograde bolus movement (ie, reflux) is occurring while simultaneously measuring changes in pH levels. It has also highlighted the importance of weakly acidic reflux in patients who do not respond to proton pump inhibitors. Weakly acidic reflux cannot be diagnosed with pH-metry alone. Impedance combined with manometry can determine whether a manometric abnormality leads to abnormal bolus clearance. In the past, this was performed with fluoroscopy, yet impedance is equally effective and does not carry the risk of increased radiation exposure. High-frequency ultrasound is currently a research tool to image the esophageal wall, particulary the two muscle layers, in real time during swallows and at rest. It has broadened our understanding of the pathophysiology of esophageal motility disorders.

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