title: Comparison of retinal thickness measurements between three-dimensional and radial scans on spectral-domain optical coherence tomography.
abstract: OBJECTIVE
  To compare retinal thickness (RT) measurements between traditional 6 radial line scans and three-dimensional (3D) scans using spectral-domain optical coherence tomography (SD-OCT).
  
  
  METHODS
  Prospective, consecutive case series.
  
  
  METHODS
  Twenty eyes of 17 patients with macular diseases and 8 healthy subjects were scanned using 2 different methods (3D scan and 6 radial line scan) using 2 different SD-OCT devices (Topcon OCT-1000 [Topcon Inc, Paramus, New Jersey, USA] and Canon SPOCT [(Canon/Optopol Inc, Depew, New York, USA]) by an experienced OCT operator. In 16 eyes, the data of TD-OCT were also obtained for comparison. The RT in 9 regions based on Early Treatment Diabetic Retinopathy Study areas were analyzed and compared. Bland-Altman plots were used to evaluate agreement.
  
  
  RESULTS
  In the eyes with macular diseases, there was no significant difference in the RT between 3D and 6 radial line scans except the center subfield (P = .011) on the Topcon OCT-1000, and inner inferior (P = .031) and outer nasal (P = .014) areas on the Canon SPOCT. In the healthy subjects, there was no significant difference between the different scans on both SD-OCT devices. The 95% limit of subjects was 3.2 to 30.6 microm and 16.7 to 28.3 microm in the eye with macular diseases on OCT-1000 and SPOCT, respectively, and 6.7 to 13.6 microm and 10.8 to 32.3 microm in healthy subjects on OCT-1000 and SPOCT, respectively.
  
  
  CONCLUSIONS
  Preliminary results suggest the RT obtained by the 2 different scan patterns, 3D scan and 6 radial line scan, did not differ significantly on SD-OCT.
authors.affiliation: Cole Eye Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
authors.forename: Kaori
authors.initials: K
authors.lastname: Sayanagi
authors.forename: Sumit
authors.initials: S
authors.lastname: Sharma
authors.forename: Peter K
authors.initials: PK
authors.lastname: Kaiser
mesh_terms: D000328:Adult; D000368:Aged; D001837:Body Weights and Measures; D005583:Fourier Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D011446:Prospective Studies; D012160:Retina / Q000473:pathology*; D012164:Retinal Diseases / Q000175:diagnosis*; D041623:Tomography, Optical Coherence / Q000379:methods*