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Code
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Display
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Definition
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128255
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OCT-A correlation mapping |
OCT angiography method that differentiates flow regions. Static regions usually have high correlation values while flow regions have lower correlation values. |
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128254
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OCT-A speckle variance |
OCT angiography method that analyzes the temporal or spatial statistics of the intensity of speckle from OCT images and identifies blood vessels. |
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128256
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Doppler OCT-A |
OCT angiography method that utilizes the Doppler phase resolved information to provide the velocity of flow. Sometimes referred to as the phase variance method. |
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128305
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OCT-A one-sided ratio (greater) |
OCT angiography method that utilizes a one-sided ratio on a pixel by pixel basis between various combinations of B-scan repetitions. The ratio is inverted when necessary such that values are greater than or equal to one. Individual ratio calculations are averaged or combined across eligible frame combinations for each pixel in the OCT image. |
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128304
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OCT-A one-sided ratio (lesser) |
OCT angiography method that utilizes a one-sided ratio on a pixel by pixel basis between various combinations of B-scan repetitions. The ratio is inverted when necessary such that values are less than or equal to one. Individual ratio calculations are averaged or combined across eligible frame combinations for each pixel in the OCT image. |
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128253
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OCT-A complex variance |
OCT angiography method based on variations in the complex (amplitude and phase) OCT signal from repeated B-scans at the same location. There are a number of factors that may cause a change in the OCT signal frequency relative to the signal due to static tissue background. These factors include, for example, the Doppler effect that induces optical frequency shift and the change in backscattering due to the particles that are moving in and out of the OCT-probe volume during imaging. The changes in signal frequency cause the changes in both the amplitude and the phase of the OCT signal. Comparison of the complex (amplitude and phase) signal from repeated B-scans at the same location provides an image that has higher contrast in areas of erythrocyte motion. This method is referred to as OCT-based micro-angiography - complex (OMAGC). |
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128252
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OCT-A amplitude decorrelation |
OCT angiography method that de-correlates the amplitudes between two consecutive B-scans from the narrowed spectral bands was computed, and all the decorrelation values within certain repeated B-scans were averaged to visualize blood vessels. Methods and algorithms for optical coherence tomography-based angiography: a review and comparison. Anqi Zhang ; Qinqin Zhang ; Chieh-Li Chen ; Ruikang K. Wang (2015). See http://biomedicaloptics.spiedigitallibrary.org/article.aspx?articleid=2464650#QuantitativeComparisons. |