Contrast-enhanced MDCT gastrography for detection of early gastric cancer: Initial assessment of "wall-carving image", a novel volume rendering technique

Masahiro Komori, Satoshi Kawanami, Daisuke Tsurumaru, Shuji Matsuura, Kiyohisa Hiraka, Akihiro Nishie, Hiroshi Honda

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Objective: We developed a new volume rendering technique, the CT gastrography wall carving image (WC) technique, which provides a clear visualization of localized enhanced tumors in the gastric wall. We evaluated the diagnostic performance of the WC as an adjunct to conventional images in detecting early gastric cancer (EGC). Materials and methods: Thirty-nine patients with 43 EGCs underwent contrast-enhanced MDCT gastrography for preoperative examination. Two observers independently reviewed the images under three different conditions: term 1, Axial CT; term 2, Axial CT, MPR and VE; and term 3, Axial CT, MPR, VE and WC for the detection of EGC. The accuracy of each condition as reviewed by each of the two observers was evaluated by receiver operating characteristic analysis. Interobserver agreement was calculated using weighted-κ statistics. Results: The best diagnostic performance and interobserver agreement were obtained in term 3. The AUCs of the two observers for terms 1, 2, and 3 were 0.63, 0.73, and 0.84, and 0.57, 0.73, and 0.76, respectively. The interobserver agreement improved from fair at term 1 to substantial at term 3. Conclusions: The addition of WC to conventional MDCT display improved the diagnostic accuracy and interobserver reproducibility for the detection of ECG. WC represents a suitable alternative for the visualization of localized enhanced tumors in the gastric wall.

Original languageEnglish
Pages (from-to)1695-1701
Number of pages7
JournalEuropean Journal of Radiology
Volume81
Issue number8
DOIs
Publication statusPublished - Aug 2012

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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