scholarly journals Wavelet Bilateral Filter Algorithm-Based High-Frequency Ultrasound Image Analysis on Effects of Skin Scar Repair

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Zhidong Xuan ◽  
Haixia Liu ◽  
Chao Li ◽  
Yongrong Liu
Keyword(s):  
Western Blot ◽  
High Frequency ◽  
Hypertrophic Scar ◽  
Ultrasound Image ◽  
Bilateral Filter ◽  
Skin Thickness ◽  
Bilateral Filtering ◽  
High Frequency Ultrasound ◽  
Skin Scar ◽  
Frequency Ultrasound

It aimed to explore the application value of high-frequency ultrasound image based on the wavelet bilateral filtering algorithm in the repair evaluation of hypertrophic scar and keloid, as well as the expression change of nerve growth factor (NGF). 72 patients with scars admitted to hospital from October 2018 to October 2019 were chosen and classified as hypertrophic scar patients (group A) and keloid patients (group B), with 36 cases in each group. All patients received scar repair treatment, and another 30 normal skin volunteers (group C) were selected. High-frequency ultrasound images based on the wavelet bilateral filter algorithm were utilized for skin examination. The expression differences of NGF and pro-NGF in each group were measured by immunohistochemical staining and Western blot. The results showed that the denoising effect (signal-to-noise ratio (PSNR) = 33.2762), structural similarity (SSIM = 0.8963), and edge similarity (FoM = 0.2975) of the proposed algorithm were better than those of bilateral filtering and wavelet soft-threshold algorithms. The skin thickness of groups A and B was considerably higher relative to that of group C ( P  < 0.05), but the echo intensity of the skin dermis of groups A and B was evidently inferior to that of group C ( P  < 0.05). The results of immunohistochemistry showed that in contrast to group C, the average optical density of NGF in groups A and B increased remarkably ( P  < 0.01). In contrast to group C, the positive expression of pro-NGF in groups A and B was notably reduced ( P  < 0.05). Western blot results showed that relative to group C, the expression of NGF protein in groups A and B was increased greatly ( P  < 0.01), but the expression of pro-NGF protein in groups A and B was reduced ( P  < 0.01). The results suggested that the wavelet bilateral filter algorithm can be adopted to evaluate pathological skin scars, and pathological skin scar formation was closely related to the expression levels of NGF and pro-NGF.

scholarly journals Morphologic Features of Cutaneous T-Cell Lymphomas Using Dermoscopy and High Frequency Ultrasound

2020 ◽  
Vol 10 (1) ◽  
pp. 17
Author(s):  
Iris Wohlmuth-Wieser ◽  
Joel M. Ramjist ◽  
Neil Shear ◽  
Raed Alhusayen
Keyword(s):  
T Cell ◽  
High Frequency ◽  
Early Stage ◽  
Skin Lesions ◽  
Diagnostic Tools ◽  
Skin Thickness ◽  
High Frequency Ultrasound ◽  
T Cell Lymphomas ◽  
Standardized Parameters ◽  
Frequency Ultrasound

The diagnosis of cutaneous T-cell lymphomas (CTCL) is frequently delayed by a median of three years and requires the clinical evaluation of an experienced dermatologist and a confirmatory skin biopsy. Dermoscopy and high-frequency ultrasound (HFUS) represent two non-invasive diagnostic tools. While dermoscopy is inexpensive and widely used for the diagnosis of melanoma and non-melanoma skin cancers, HFUS of skin lymphomas represents a novel diagnostic approach that is not yet implemented in the routine dermatologic practice. The aim of our study was to prospectively assess skin lesions of patients with either CTCL patches or plaques with dermoscopy and HFUS and to compare the findings with atopic dermatitis (AD) and psoriasis. Thirteen patients with an established diagnosis of CTCL, psoriasis, or AD were studied: Dermoscopy features including spermatozoa-like structures and the presence of white scales could assist in differentiating between early-stage CTCL and AD. HFUS measurements of the skin thickness indicated increased epidermal-, thickness in CTCL, and psoriasis compared with AD. Our results support the use of dermoscopy as a useful tool to diagnose CTCL. HFUS could augment the dermatologic assessment, but further studies will be needed to define standardized parameters.

scholarly journals High frequency ultrasound assessment of systemic sclerosis skin involvement: intra-observer repeatability and relationship with clinician assessment and dermal collagen content

2020 ◽  
pp. jrheum.200234
Author(s):  
Victoria A. Flower ◽  
Shaney L. Barratt ◽  
Darren J. Hart ◽  
Amanda B. Mackenzie ◽  
Jacqueline A. Shipley ◽  
...  
Keyword(s):  
Systemic Sclerosis ◽  
High Frequency ◽  
Convergent Validity ◽  
Objective Assessment ◽  
Collagen Content ◽  
Skin Thickness ◽  
High Frequency Ultrasound ◽  
Dermal Collagen ◽  
The Relationship ◽  
Frequency Ultrasound

Objective The modified Rodnan skin score (mRSS) remains the preferred method for skin assessment in systemic sclerosis (SSc). There are concerns regarding high inter-observer variability of mRSS and negative clinical trials utilising mRSS as the primary endpoint. High frequency ultrasound (HFUS) allows objective assessment of cutaneous fibrosis in SSc. We investigated the relationship between HFUS with both mRSS and dermal collagen. Methods Skin thickness (ST), echogenicity and novel Shear wave elastography (SWE) were assessed in 53 SSc patients and 15 healthy controls (HC) at the finger, hand, forearm and abdomen. The relationship between HFUS parameters with mRSS (n=53) and dermal collagen (10 SSc patients and 10 HC) was investigated. Intra-observer repeatability of HFUS was calculated using intra-class correlation coefficients (ICCs). Results HFUS assessment of ST (hand/forearm) and SWE (finger/hand) correlated with local mRSS at some sites. Subclinical abnormalities in ST, echogenicity and SWE were present in clinically uninvolved SSc skin. Additionally, changes in echogenicity and SWE were sometimes apparent despite objectively normal ST on HFUS. ST, SWE and local mRSS correlated strongly with collagen quantification (rho 0.697, 0.709, 0.649 respectively). Intra-observer repeatability was high for all HFUS parameters (ICCs for ST 0.946-0.978, echogenicity 0.648- 0.865 and SWE 0.953-0.973). Conclusion Our data demonstrates excellent reproducibility and reassuring convergent validity with dermal collagen content. Detection of subclinical abnormalities is an additional benefit of HFUS. The observed correlations with collagen quantification support further investigation of HFUS as an alternative to mRSS in clinical trial settings.

scholarly journals P162 Cross-validation and complementary value of optical coherence tomography and high frequency ultrasound for the assessment of skin disease in systemic sclerosis

Rheumatology ◽  
2020 ◽  
Vol 59 (Supplement_2) ◽  
Author(s):  
Duygu Temiz Karadag ◽  
Giovanni Lettieri ◽  
Valentina Picerno ◽  
Ozcan Gundogdu ◽  
Maria Carmela Padula ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Systemic Sclerosis ◽  
Skin Disease ◽  
High Frequency ◽  
Skin Thickness ◽  
Optical Coherence ◽  
Skin Involvement ◽  
High Frequency Ultrasound ◽  
Complementary Value ◽  
Frequency Ultrasound

Abstract Background The modified Rodnan skin score (mRSS) is the current gold standard for skin assessment in systemic sclerosis (SSc) both in clinical trials and practice. Several studies have reported that skin high frequency ultrasound (HFUS) and, more recently, optical coherence tomography (OCT) are able to reflect the severity of the skin disease in SSc. Aim of the study was to compare OCT and HFUS in the assessment of skin involvement in SSc. Methods Dorsal forearm skin of consecutive diffuse cutaneous SSc (dcSSc) patients and matched-healthy controls (HC) were scanned using OCT and HFUS by investigators blinded to the clinical details using Vivosight scanner (1 assessor) and Esaote MyLab70 equipped with a 22 MHZ probe (2 assessors) respectively. Minimum Optical Density (MinOD), Maximum OD (MaxOD) and OD at 300 micron-depth (OD300) (OCT) and skin thickness (HFUS) were measured. Clinical involvement was assessed by a blinded operator using the mRSS and results were cross matched with imaging data. Statistical analysis was performed using GraphPad Prism software V.7.0. Results A total of 88 OCT images and 176 HFUS images were obtained from 22 dcSSc patients [20 Female, mean age 49 (±11) years, 12 with &lt; 5 years disease duration) and 22 HC (20 Female, mean age 50.7 (±6.7) years]. All OCT measures (MinOD, MaxOD and OD300) were significantly lower in SSc patients than in HC (p = 0.011, p &lt; 0.0001, p &lt; 0.0001 respectively). HFUS showed a lower performance in discriminating SSc skin vs HC compared to OCT (overall AUC 0.6 vs 0.72, 0.8 and 0.89 for MinOD, MaxOD and OD300 respectively). Nevertheless, mean HFUS skin thickness significantly correlated with mRSS at site of analysis (r = 0.47, p = 0.0013) and showed overall excellent interobserver reliability between assessors (ICC &gt;0.8). Importantly, MaxOD and OD300 negatively correlated with HFUS skin thickness (r=-0.32, p = 0.035; r=-0.31, p = 0.039). Conclusion OCT of the skin has been previously validated against skin biopsy in SSc. Our results validate HFUS against OCT and indicate that HFUS of the skin is a reliable measure of skin involvement. Further, here we show that HFUS and OCT outperform each other in measuring different aspects of skin involvement in SSc and they offer complementary surrogate outcome measures of disease. Disclosures D. Temiz Karadag None. G. Lettieri None. V. Picerno None. O. Gundogdu None. M. Padula None. G.A. Mennillo None. A.A. Padula None. F. Del Galdo None. S. D'Angelo None. G. Abignano None.

scholarly journals Photoacoustic and High-Frequency Ultrasound Imaging of Systemic Sclerosis Patients

2020 ◽  
Author(s):  
Brigit E. Kersten ◽  
Khalid Daoudi ◽  
Cornelia H van den Ende ◽  
Frank H van den Hoogen ◽  
Chris L. de Korte ◽  
...  
Keyword(s):  
Systemic Sclerosis ◽  
Oxygen Saturation ◽  
High Frequency ◽  
Skin Thickness ◽  
Healthy Individuals ◽  
High Frequency Ultrasound ◽  
The Third ◽  
Significant Difference ◽  
Primary Raynaud’S Phenomenon ◽  
Frequency Ultrasound

Abstract Introduction: Systemic sclerosis starts with an early phase characterized by Raynauds phenomenon, puffy fingers/hands, autoantibodies and a scleroderma nailfold­microscopic pattern. Alterations in the nailfoldmicroscopic pattern are not evident in all early SSc patients. Photoacoustics(PA) and high-frequency ultrasound (HFUS) could fulfill this need. The former can measure oxygen saturation while the latter can measure skin thickening. We hypothesize that photoacoustics and high-frequency ultrasound can distinguish (early) SSc patients from individuals with primary Raynaud's phenomenon (PRP) by measuring oxygenation of the fingertip and skin thickening.Methods: We compared measurements of the third finger in (early)SSc patients to healthy and PRP individuals. The level of oxygenation and skin thickness were compared between groups. Nailfoldcapillaroscopy was performed on all subjects.Results: Thirty-one adult subjects participated in this study: twelve patients with SSc, 5 patients with early SSc, 5 volunteers with PR and 9 healthy controls. We found a significant difference in oxygen saturation between (early) SSc patients (80.8% ± 8.1 and 77,9% ± 10.5 ) and individuals with PRP (93.9% ± 1.1). Measurements of skin thickening showed a significant difference in (early) SSc patients compared to individuals with PRP (0.48 ± 0.06 mm and 0.51 ±0.16 mm vs. 0.27 ± 0.01 mm). There was no significant difference between healthy and PRP individuals in oxygenation or skin thickening.Conclusion: Photoacoustic and high-frequency ultrasound can distinguish between (early)SSc, PRP and healthy individuals in both oxygenation and skin thickening.

Measurement of the skin thickness by high-frequency ultrasound in newborns v1 (protocols.io.nfedbje)

protocols.io ◽  
2018 ◽  
Author(s):  
Gabriela Luiza ◽  
Regina Am ◽  
Ingrid Michelle ◽  
Rodney Nascimento ◽  
Zilma Silveira
Keyword(s):  
High Frequency ◽  
Skin Thickness ◽  
High Frequency Ultrasound ◽  
Frequency Ultrasound
Sign in / Sign up

Export Citation Format

Share Document