ROC analysis of detection of interval changes in interstitial lung diseases on digital chest radiographs using the temporal subtraction technique

Higashida Yoshiharu, Ideguchi Tadamitsu, Muranaka Toru, Tabata Nobuyuki, Miyajima Ryuichi, Akazawa Fumio, Ikeda Hirotaka, Morimoto Ken, Masafumi Ohki, Toyofuku Fukai, Doi Kunio

Research output: Contribution to journalArticle

Abstract

Purpose: To demonstrate the clinical usefulness of a temporal subtraction technique for the detection of interval changes in various interstitial lung diseases on digital chest radiographs. Materials and Methods: One hundred pairs of chest radiographs in 34 patients (63 with and 37 without interval changes) with various interstitial lung diseases were selected. All cases were confirmed by serial chest computed tomography (CT) and ascertained by radiologists. All chest radiographs were obtained with a computed radiography (CR) system, and temporal subtraction images were produced with an iterative image-warping technique. Four radiologists and two thoracic physicians provided confidence levels for interval changes in interstitial lung diseases with and without temporal subtraction. Their performances with and without temporal subtraction were evaluated by means of receiver operating characteristic (ROC) analysis using a sequential test. Results: The area under the ROC curve (Az) values of six observers obtained with and without temporal subtraction were 0.90 and 0.78, respectively. Results showed that the detection of interval changes in interstitial lung diseases was significantly improved by the use of temporal subtraction images compared with CR images alone (P=0.002), Furthermore, the high detection rate was achieved with temporal subtraction images regardless of the subtlety and location of interval changes. Conclusion: Temporal subtraction improved the diagnostic accuracy of radiologists in detecting interval changes in interstitial lung diseases on chest radiographs. It was also useful for cases of multiple interval changes.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalNippon Acta Radiologica
Volume64
Issue number1
Publication statusPublished - Jan 25 2004

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All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging
  • Oncology

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