Effects of Speckle Reduction Processing on Ultrasound B-Mode Images of Skin Tumours

1992 ◽  
pp. 447-452 ◽  
Author(s):  
J. C. Bamber ◽  
D. C. Crawford ◽  
D. A. Bell ◽  
C. C. Harland ◽  
B. A. Gusterson ◽  
...  
Keyword(s):  
Speckle Reduction ◽  
Skin Tumours

Laser Beam Modulation with a Fast Focus Tunable Lens for Speckle Reduction in Laser Projection Displays

2019 ◽  
pp. 1275
Author(s):  
Zequn Jian ◽  
Zhaomin Tong ◽  
Yifei Ma ◽  
Mei Wang ◽  
Suotang Jia ◽  
...  
Keyword(s):  
Laser Beam ◽  
Speckle Reduction ◽  
Beam Modulation ◽  
Laser Beam Modulation ◽  
Tunable Lens

Speckle reduction of SAR image based on morphological Haar wavelet

2013 ◽  
Vol 32 (3) ◽  
pp. 746-748 ◽  
Author(s):  
Min LI ◽  
Zi-you ZHANG ◽  
Lin-ju LU
Keyword(s):  
Haar Wavelet ◽  
Speckle Reduction ◽  
Sar Image

scholarly journals Identification of Polyomaviruses in Skin Cancers

Intervirology ◽  
2021 ◽  
pp. 96-102
Author(s):  
Pedro V.A. Costa ◽  
Patricia S. Ishiy ◽  
Paulo R.P. Urbano ◽  
Camila M. Romano ◽  
Stephen K. Tyring ◽  
...  
Keyword(s):  
Cell Carcinoma ◽  
Normal Skin ◽  
Dermatofibrosarcoma Protuberans ◽  
Epidemiological Data ◽  
Skin Carcinogenesis ◽  
P Value ◽  
Merkel Cell ◽  
Cross Sectional ◽  
Skin Tumours ◽  
Skin Tumour

Background: Polyomaviruses (PyVs) were initially described in animals. They have also been detected in humans with some evidence that could play a role in skin carcinogenesis. Objectives: This study aimed to verify the presence of PyVs in different skin tumour samples and to make clinical correlations with patients’ epidemiological data from Clinics Hospital of Medical School of University of São Paulo, Brazil. Methods: This is a cross-sectional study. A random selection was performed of 120 patients with histopathological exams of different cutaneous neoplasms equally divided into 6 groups and 20 patients with normal skin. The available skin specimens were analysed with 2 different techniques of PCR (conventional and real time) for detection of PyV DNA. Concomitantly, retrospective analysis of the respective medical records for the collection of epidemiological data was done. Analyses suitable for categorical data were used to compare the proportion of patients in each group. Results: PyV DNA was found in 25.69% of the samples: 15% in basal cell carcinoma group, 15% in squamous cell carcinoma, 28.57% in melanoma, 15% in dermatofibrosarcoma protuberans, 13.33% in Kaposi sarcoma, 65% in Merkel cell carcinoma (MCC), and none in normal skin. Merkel cell PyV detection was statistically significant in MCC patients (p value <0.01), but no correlations were found between PyVs and others skin tumours. Conclusion: This study demonstrated the presence of PyVs in different skin tumours; however, no association of any PyVs found in any skin tumour with epidemiological data could be shown. Further studies are still needed to elucidate the mechanisms of PyVs in skin carcinogenesis.

Selection of Suitable Window Size for Speckle Reduction and Deblurring using SOFM in Polarimetric SAR Images

2015 ◽  
Vol 43 (4) ◽  
pp. 739-750 ◽  
Author(s):  
Sanjay Shitole ◽  
Shaunak De ◽  
Y. S. Rao ◽  
B. Krishna Mohan ◽  
Anup Das
Keyword(s):  
Window Size ◽  
Speckle Reduction ◽  
Polarimetric Sar ◽  
Sar Images ◽  
Selection Of

scholarly journals Dynamic Speckle Illumination Digital Holographic Microscopy by Doubly Scattered System

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 276
Author(s):  
Yun Liu ◽  
Peihua Bu ◽  
Mingxing Jiao ◽  
Junhong Xing ◽  
Ke Kou ◽  
...  
Keyword(s):  
Time Correlation ◽  
Digital Holographic Microscopy ◽  
Laser Source ◽  
Speckle Reduction ◽  
Single Shot ◽  
Coherent Noise ◽  
Real Time Measurement ◽  
Dynamic Speckle ◽  
Holographic Microscopy ◽  
Speckle Suppression

The coherent noise always exists in digital holographic microscopy due to the laser source, degrading the image quality. A method of speckle suppression using the dynamic speckle illumination, produced by double-moving diffusers, is presented in digital holographic microscopy. The space–time correlation functions are theoretically analyzed from the statistics distribution in the doubly and singly scattered system, respectively. The configuration of double-moving diffusers is demonstrated to have better performance in speckle suppression compared with the single diffuser and moving-static double diffusers cases. The experiment results verify the feasibility of the approach. The presented approach only requires a single shot interferogram to realize the speckle reduction, accordingly it has the potential application in real-time measurement.

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