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Evaluation of Hippocampal Volume Based on Various Inversion Time in Normal Adults by Manual Tracing and Automated Segmentation Methods

  • Kim, Ju Ho (Department of Convergence Medical Science, Gyeongsang National University Graduate School) ;
  • Choi, Dae Seob (Department of Radiology, Gyeongsang National University School of Medicine) ;
  • Kim, Seong-hu (Department of Radiology, Gyeongsang National University Hospital) ;
  • Shin, Hwa Seon (Department of Radiology, Gyeongsang National University School of Medicine) ;
  • Seo, Hyemin (Department of Radiology, Gyeongsang National University School of Medicine) ;
  • Choi, Ho Cheol (Department of Radiology, Gyeongsang National University School of Medicine) ;
  • Son, Seungnam (Department of Neurology, Gyeongsang National University School of Medicine) ;
  • Tae, Woo Suk (Neuroscience Research Institute, Kangwon National University School of Medicine) ;
  • Kim, Sam Soo (Department of Radiology, Kangwon National University School of Medicine)
  • Received : 2015.04.28
  • Accepted : 2015.05.20
  • Published : 2015.06.30

Abstract

Purpose: To investigate the value of image post-processing software (FreeSurfer, IBASPM [individual brain atlases using statistical parametric mapping software]) and inversion time (TI) in volumetric analyses of the hippocampus and to identify differences in comparison with manual tracing. Materials and Methods: Brain images from 12 normal adults were acquired using magnetization prepared rapid acquisition gradient echo (MPRAGE) with a slice thickness of 1.3 mm and TI of 800, 900, 1000, and 1100 ms. Hippocampal volumes were measured using FreeSurfer, IBASPM and manual tracing. Statistical differences were examined using correlation analyses accounting for spatial interpretations percent volume overlap and percent volume difference. Results: FreeSurfer revealed a maximum percent volume overlap and maximum percent volume difference at TI = 800 ms ($77.1{\pm}2.9%$) and TI = 1100 ms ($13.1{\pm}2.1%$), respectively. The respective values for IBASPM were TI = 1100 ms ($55.3{\pm}9.1%$) and TI = 800 ms ($43.1{\pm}10.7%$). FreeSurfer presented a higher correlation than IBASPM but it was not statistically significant. Conclusion: FreeSurfer performed better in volumetric determination than IBASPM. Given the subjective nature of manual tracing, automated image acquisition and analysis image is accurate and preferable.

Keywords

References

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