Accuracy improvement of pulmonary nodule detection based on spatial statistical analysis of thoracic CT scans

Hotaka Takizawa, Shinji Yamamoto, Tsuyoshi Shiina

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


This paper describes a novel discrimination method of pulmonary nodules based on statistical analysis of thoracic computed tomography (CT) scans. Our previous Computer-Aided Diagnosis (CAD) system can detect pulmonary nodules from CT scans, but, at the same time, yields many false positives. In order to reduce the false positives, the method proposed in the present paper uses a relationship between pulmonary nodules, false positives and image features in CT scans. The trend of variation of the relationships is acquired through statistical analysis of a set of CT scans prepared for training. In testing, by use of the trend, the method predicts the appearances of pulmonary nodules and false positives in a CT scan, and improves the accuracy of the previous CAD system by modifying the system's output based on the prediction. The method is applied to 218 actual thoracic CT scans with 386 actual pulmonary nodules. The receiver operating characteristic (ROC) analysis is used to evaluate the results. The area under the ROC curve (Az) is statistically significantly improved from 0.918 to 0.931.

Original languageEnglish
Pages (from-to)1168-1174
Number of pages7
JournalIEICE Transactions on Information and Systems
Issue number8
Publication statusPublished - 2007 Aug
Externally publishedYes


  • Computer-Aided Diagnosis
  • Detection of pulmonary nodules
  • Spatial relationship
  • Statistical analysis
  • Thoracic CT scans

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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