Speckle reduction in optical coherence tomography imaging by affine-motion image registration

Alonso‐Caneiro, David; Read, Scott A.; Collins, Michael J.

doi:10.1117/1.3652713

Cited by 71 publications

(51 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The details of this processing method have been presented elsewhere. 23 The final outcome of each animation mode measurement is a single averaged B-scan with reduced noise and subsequently with a clearer distinction between tissue layers. Fig.…”

Section: Methods For Oct Data Acquisition and Analysismentioning

confidence: 99%

Using Optical Coherence Tomography to Assess Corneoscleral Morphology After Soft Contact Lens Wear

Alonso‐Caneiro¹,

Shaw²,

Collins

2012

Optometry and Vision Science

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Methods For Oct Data Acquisition and Analysismentioning

confidence: 99%

Using Optical Coherence Tomography to Assess Corneoscleral Morphology After Soft Contact Lens Wear

Alonso‐Caneiro¹,

Shaw²,

Collins

2012

Optometry and Vision Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…36 These averaged images then were analyzed by two independent masked observers to manually segment the outer border of the RPE and the inner border of the chorioscleral interface across the 6 mm length of each scan to determine choroidal thickness. Each observer manually selected a series of points along the two boundaries, and a smooth function (a series of spline fits) then was fit automatically to these points to define the boundaries (initially the observers used 14 points along each boundary, but additional points could be added by the observers if the resulting line did not fit the boundary adequately).…”

Section: Discussionmentioning

confidence: 99%

Choroidal Thickness in Childhood

Read¹,

Collins²,

Vincent³

et al. 2013

Invest. Ophthalmol. Vis. Sci.

Self Cite

150

142

View full text Add to dashboard Cite

PURPOSE. We examined choroidal thickness (ChT) and its spatial distribution across the posterior pole in pediatric subjects with normal ocular health and minimal refractive error. METHODS.ChT was assessed using spectral domain optical coherence tomography (OCT) in 194 children aged 4 to 12 years, with spherical equivalent refractive errors between þ1.25 and À0.50 diopters sphere (DS). A series of OCT scans were collected, imaging the choroid along 4 radial scan lines centered on the fovea (each separated by 458). Frame averaging was used to reduce noise and enhance chorioscleral junction visibility. The transverse scale of each scan was corrected to account for magnification effects associated with axial length. Two independent masked observers segmented the OCT images manually to determine ChT at foveal center, and averaged across a series of perifoveal zones over the central 5 mm.RESULTS. The average subfoveal ChT was 330 6 65 lm (range, 189-538 lm), and was influenced significantly by age (P ¼ 0.04). The ChT of the 4-to 6-year-old age group (312 6 62 lm) was significantly thinner compared to the 7-to 9-year-olds (337 6 65 lm, P < 0.05) and bordered on significance compared to the 10-to 12-year-olds (341 6 61 lm, P ¼ 0.08). ChT also exhibited significant variation across the posterior pole, being thicker in more central regions. The choroid was thinner nasally and inferiorly compared to temporally and superiorly. Multiple regression analysis revealed age, axial length, and anterior chamber depth were associated significantly with subfoveal ChT (P < 0.001).CONCLUSIONS. ChT increases significantly from early childhood to adolescence. This appears to be a normal feature of childhood eye growth.

show abstract

“…Incoherent averaging of these decorrelated images reduces the speckle noise [18,19]. In another method, image registration followed by averaging of multiple B-scans is used to reduce speckle [20].…”

Section: Speckle Reduction and Signal Improvementmentioning

confidence: 99%