Speckle Reduction Techniques

Schmitt, Joe; Xiang, Shao‐Hua; Yung, Kin Man

doi:10.1201/b14024-8

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…Several techniques have been introduced to reduce speckle noise, mainly based on spatial compounding [11][12][13] or on digital signal-processing algorithms. 14 The concept of wavelength compounding was first introduced in the field of OCT by Schmitt et al 11 However, this method was restricted to compounding of wavelengths contained within the emission spectrum of a single light source, which, as a consequence, reduced longitudinal spatial resolution, a disadvantage that prevented its widespread use in OCT. In this paper we introduce an alternative approach using a frequency compounding-based speckle reduction technique.…”

Section: Introductionmentioning

confidence: 99%

Speckle reduction in optical coherence tomography by frequency compounding

et al. 2003

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We are investigating the possibility of a frequency compounding method for speckle reduction in optical coherence tomography. The method is based on incoherent summation of the magnitudes of two independent interferometric signals, which were recorded at two different center wavelengths simultaneously. We derive the corresponding statistics and compare the theoretical results with measurements obtained in a uniformly scattering sample. Finally we demonstrate our method by comparing images of human skin recorded in vivo with and without frequency compounding. The compounding method results in an increased contrast and improved image quality without loss of resolution.

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Section: Introductionmentioning

confidence: 99%

Speckle reduction in optical coherence tomography by frequency compounding

et al. 2003

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“…This was defined as the ratio of the magnitude of the initial surface peak over the second 2 nd (DEJ) peak. Various imaging analysis methods have been developed for enhancing structures and edges, speckle reduction and denoising OCT images [14–16]. Last year we demonstrated that image processing methods can further improve the visibility of subsurface occlusal lesions [17].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of OCT images with vinyl polysiloxane (VPS)

2016

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Several studies have shown that optical coherence tomography (OCT) can be used to measure the remaining enamel thickness and detect the location of subsurface lesions hidden under the sound enamel. Moreover studies have shown that high refractive index liquids can be used to improve the visibility of subsurface lesions in OCT images. In this study, we demonstrate that vinyl polysiloxane (VPS) impression materials which are routinely used in dentistry can be used to enhance the detection of dentinal lesions on tooth occlusal surfaces. Lesion presence was confirmed with polarized light microscopy and microradiography.

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“…Various imaging analysis methods have been developed for enhancing structures and edges, speckle reduction and denoising OCT images [15-17]. The Rotating Kernel Transformation (RKT) is one approach that has been successful for edge detection in OCT images [18-21].…”

Section: Introductionmentioning

confidence: 99%

Enhanced detection of dentinal lesions in OCT images using the RKT transformation

et al. 2015

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Several studies have shown that optical coherence tomography (OCT) can be used to measure the remaining enamel thickness and detect the location of subsurface lesions hidden under the sound enamel. The purpose of this study was to develop algorithms to enhance the visibility of subsurface structures such as hidden occlusal lesions and the dentinal-enamel junction. Extracted teeth with natural occlusal lesions were imaged with OCT with and without added high index fluids. A Rotating Kernel Transformation (RKT) nonlinear image processing filter was applied to PS-OCT images to enhance the visibility of the subsurface lesions under the sound enamel. The filter significantly increased (P<0.05) the visibility of the subsurface lesions.

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Speckle Reduction Techniques

Cited by 7 publications

References 21 publications

Speckle reduction in optical coherence tomography by frequency compounding

Speckle reduction in optical coherence tomography by frequency compounding

Enhancement of OCT images with vinyl polysiloxane (VPS)

Enhanced detection of dentinal lesions in OCT images using the RKT transformation

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