![]() ![]() The combined data from the six radial scans of the FMTM scanning protocol is represented in the FMTM retinal map analysis report. Over 30,000 OCT scans are evaluated annually at the reading center and nearly 30% need manual remeasurement. Manual remeasurement of foveal thickness is performed in scans with faulty centerpoint thickness (CPT). Artifacts generated by the software are common and could potentially produce erroneous data. Table 1 summarizes the artifacts frequently seen in OCTs. Quality of the OCT is one of the most important evaluation procedures used by the ODE since it determines if the software-generated numeric data is erroneous or not. The scans are taken by trained and certified operators and evaluated at the reading center by ocular disease evaluators (ODE). The fundus photograph reading center (FPRC), Madison WI, USA, serves as a central laboratory to receive and analyze OCTs for multicenter clinical trials. Longitudinal assessment of the foveal thickness on OCT is an important outcome measure for many therapeutic trials. ![]() Due to its time efficiency, the FMTM protocol is frequently preferred. The FMTM scans have a low resolution (128 A-scans/B-scan) and are less time-consuming (1.92 sec for the entire scan) whereas the MTM scans provide high-resolution images (512 A-scans/B-scan) with each radial line taking 1.28 sec. Both MTM and FMTM consist of six radial line scans which cover a diameter of 6 mm and generate thickness reports which are extremely useful for quantitative analysis. The Stratus OCT comes with various scanning programs the most commonly used protocols for retinal pathologies are line scan, cross hair scan, the macular thickness map protocol (MTM) and the fast macular thickness map protocol (FMTM). OCT-measured retinal thickness value is an important outcome measure in many therapeutic intervention trials. The numeric plots are used for quantification of macular disease and monitoring progression. Apart from being used for detailed morphological evaluation, OCT is also used for quantitative analysis of retinal thickness. The introduction of Stratus optical coherence tomogram (OCT) (Zeiss, Meditec, Dublin, CA) has advanced the knowledge and understanding of retinal diseases. ![]()
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