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:: Volume 26, Issue 3 (Iranian Journal of Ophthalmology 2014) ::
2014, 26(3): 155-159 Back to browse issues page
Optical Coherence Tomography Grid Decentration and Its Effect on Macular Thickness Measurements
Khalil Ghasemi Falavarjani Dr., Joobin Khadamy Dr. * , Nasser Karimi Dr., Anis Alsadat Jazayeri Dr., Foad Amirkourjani
, joobin_kh@hotmail.com
Abstract:   (6077 Views)
   

Purpose: To evaluate the rate of optical coherence tomography (OCT) grid decentration in a routine practice and its effect on thickness measurements

 

Methods: Topcon spectral domain OCT scans from various macular diseases including age related macular degeneration, diabetic macular edema, macular pucker and central serous chorioretinopathy (CSCR) were studied in all patients visited during seven consecutive days. In each scan, the macular EDTRS grid was evaluated for decentration. After grid adjustment, the changes in central subfield thickness (CST) measurements were recorded. Differences >1 µm and >8.5 µm between automatically determined and manually adjusted CST measurements were recorded as grid decentration and significant grid decentration.

 

Results: Ninety-three OCT scans of 93 eyes were evaluated. Thirty-three scans were unreliable for grid adjustment. In the remaining 60 eyes, grid decentration was found in 32 eyes (53.3%). The mean change in CST after grid adjustment was 41.1±55.01 (3-251) microns. Clinically significant CST changes were found in 24 eyes (40%). No significant relationship was found between underlying disease and corrected CST, and grid decentration.

 

Conclusion: Abnormal retinal thickness map was found in a significant number of scans. Topcon OCT scans should be evaluated routinely for grid decentration.

 

 

 Iranian Journal of Ophthalmology 201426(3):155-9 © 2014 by the Iranian Society of Ophthalmology
Keywords: Optical Coherence Tomography, Retinal Thickness, Artifact
Full-Text [PDF 195 kb]   (1418 Downloads)    
Type of Study: Original | Subject: Vitreoretinal
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Ghasemi Falavarjani K, Khadamy J, Karimi N, Jazayeri A A, Amirkourjani F. Optical Coherence Tomography Grid Decentration and Its Effect on Macular Thickness Measurements. Iranian Journal of Ophthalmology. 2014; 26 (3) :155-159
URL: http://irjo.org/article-1-1006-en.html


Volume 26, Issue 3 (Iranian Journal of Ophthalmology 2014) Back to browse issues page
مجله چشم پزشکی ایران Iranian Journal of Ophthalmology
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