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OCT: Technique and Image Interpretation

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Dr G Sengottuvelu, Chennai    04 January 2018

  1. The received signals, depending on the tissue characters (that determines the back scatter and attenuation) are reconstructed and displayed in cross section. The back scattered optical echoes are processed based on the frequency change (frequency domain) or time change (time domain). As the speed of light is extremely high, a reference mirror is used in the time domain OCT to calculate the relative rather than the absolute change.
  2. Processing of frequency domain OCT signals has better spatial and temporal resolution. The present generation OCT machines use only FD-OCT. As blood is opaque to light, it has to be replaced with a transparent medium like the contrast medium during image acquisition.
  3. The learning curve for OCT image interpretation is much shorter than IVUS and because of its high resolution, the type of plaque can be recognized well and appropriate strategy planned.

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