Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
Improvement in Visibility of Simulated Lung Nodules on Computed Radiography (CR) Chest Images by Use of Temporal Subtraction Technique
NOBUHIRO ODASHIGEHIKO KATSURAGAWAKUNIO DOIKEIJI FUJIMOTOSEIICHI MURAKAMIHAJIME NAKATA
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1999 Volume 55 Issue 11 Pages 1101-1108

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Abstract

A temporal subtraction image obtained by subtraction of a previous image from a current one can enhance interval change on chest images. In this study, we compared the visibility of simulated lung nodules on CR images with and without temporal subtraction. Chest phantom images without and with simulated nodules were obtained as previous and current images, respectively, by a CR system. Then, subtraction images were produced with an iterative image warping technique. Twelve simulated nodules were attached on various locations of the chest phantom. The diameter of nodules having a CT number of 47 ranged from 3 mm to 10 mm. Seven radiologists subjectively evaluated the visibility of simulated nodules on CR images with and without temporal subtraction using a three-point rating scale (0: invisible, +1: questionable, +2:visible). The minimum diameter of simulated nodules visible at a frequency greater than 50% was 4 mm on the CR images with temporal subtraction and 6 mm on those without. Our results indicated that the subtraction images clearly improved the visibility of simulated nodules.

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© 1999 Japanese Society of Radiological Technology
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