Automated volumetry of postoperative skull defect on brain CT

Ke Chun Huang, Chun Chih Liao, Furen Xiao, Charles Chih Ho Liu, I. Jen Chiang, Jau Min Wong

研究成果: 雜誌貢獻文章同行評審

2 引文 斯高帕斯(Scopus)

摘要

The volume of the skull defect should be one of the most important quantitative measures for decompressive craniectomy. However, there has been no study focusing on automated estimation of the volume from postoperative computed tomography (CT). This study develops and validates three methods that can automatically locate, recover and measure the missing skull region based on symmetry without preoperative images. The low resolution estimate (LRE) method involves downsizing CT images, finding the axis of symmetry for each slice, and estimating the location and size of the missing skull regions. The intact mid-sagittal plane (iMSP) can be defined either by dimension-by-dimension (DBD) method as a global symmetry plane or by Liu's method as a regression from each slices. The skull defect volume can then be calculated by skull volume difference (SVD) with respect to each iMSP. During a 48-month period between July 2006 and June 2010 at a regional hospital in northern Taiwan, we collected 30 sets of nonvolumetric CT images after craniectomies. Three board-certified neurosurgeons perform computer-assisted volumetric analysis of skull defect volume VMan as the gold standard for evaluating the performance of our algorithm. We compare the error of the three volumetry methods. The error of VLRE is smaller than that of VLiu (p <0.0001) and VDBD (p = 0.034). The error of VDBD is significant smaller than that of VLiu (p = 0.001). The correlation coefficients between VMan and VLRE, VLiu, VDBD are 0.98, 0.88 and 0.95, respectively. In conclusion, these methods can help to define the skull defect volume in postoperative images and provide information of the immediate volume gain after decompressive craniectomies. The iMSP of the postoperative skull can be reliably identified using the DBD method.

原文英語
文章編號1350033
期刊Biomedical Engineering - Applications, Basis and Communications
25
發行號3
DOIs
出版狀態已發佈 - 六月 2013

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Bioengineering

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