You need JavaScript to view this

A method of clustering observers with different visual characteristics

Abstract

Evaluation of observer's image perception in medical images is important, and yet has not been performed because it is difficult to quantify visual characteristics. In the present study, we investigated the observer's image perception by clustering a group of 20 observers. Images of a contrast-detail (C-D) phantom, which had cylinders of 10 rows and 10 columns with different diameters and lengths, were acquired with an X-ray screen-film system with fixed exposure conditions. A group of 10 films were prepared for visual evaluations. Sixteen radiological technicians, three radiologists and one medical physicist participated in the observation test. All observers read the phantom radiographs on a transillumination image viewer with room lights off. The detectability was defined as the shortest length of the cylinders of which border the observers could recognize from the background, and was recorded using the number of columns. The detectability was calculated as the average of 10 readings for each observer, and plotted for different phantom diameter. The unweighted pair-group method using arithmetic averages (UPGMA) was adopted for clustering. The observers were clustered into two groups: one group selected objects with a demarcation from the vicinity, and the other group searched for the objects with their eyes constrained.  More>>
Authors:
Niimi, Takanaga; [1]  Imai, Kuniharu; [1]  Ikeda, Mitsuru; [1]  Maeda, Hisatoshi [1] 
  1. Nagoya University School of Health Sciences, Department of Radiological Technology, 1-1-20 Daiko-minami, Higashi-ku, Nagoya 461-8673 (Japan)
Publication Date:
Jan 15, 2006
Product Type:
Journal Article
Resource Relation:
Journal Name: European Journal of Radiology; Journal Volume: 57; Journal Issue: 1; Other Information: DOI: 10.1016/j.ejrad.2005.05.015; PII: S0720-048X(05)00217-2; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; EVALUATION; EYES; IMAGES; PERSONNEL; PHANTOMS; QUALITY CONTROL
OSTI ID:
20774299
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0720-048X; EJRADR; TRN: NL06R0744077846
Submitting Site:
NLN
Size:
page(s) 158-161
Announcement Date:
Oct 14, 2006

Citation Formats

Niimi, Takanaga, Imai, Kuniharu, Ikeda, Mitsuru, and Maeda, Hisatoshi. A method of clustering observers with different visual characteristics. Netherlands: N. p., 2006. Web. doi:10.1016/j.ejrad.2005.05.015.
Niimi, Takanaga, Imai, Kuniharu, Ikeda, Mitsuru, & Maeda, Hisatoshi. A method of clustering observers with different visual characteristics. Netherlands. doi:10.1016/j.ejrad.2005.05.015.
Niimi, Takanaga, Imai, Kuniharu, Ikeda, Mitsuru, and Maeda, Hisatoshi. 2006. "A method of clustering observers with different visual characteristics." Netherlands. doi:10.1016/j.ejrad.2005.05.015. https://www.osti.gov/servlets/purl/10.1016/j.ejrad.2005.05.015.
@misc{etde_20774299,
title = {A method of clustering observers with different visual characteristics}
author = {Niimi, Takanaga, Imai, Kuniharu, Ikeda, Mitsuru, and Maeda, Hisatoshi}
abstractNote = {Evaluation of observer's image perception in medical images is important, and yet has not been performed because it is difficult to quantify visual characteristics. In the present study, we investigated the observer's image perception by clustering a group of 20 observers. Images of a contrast-detail (C-D) phantom, which had cylinders of 10 rows and 10 columns with different diameters and lengths, were acquired with an X-ray screen-film system with fixed exposure conditions. A group of 10 films were prepared for visual evaluations. Sixteen radiological technicians, three radiologists and one medical physicist participated in the observation test. All observers read the phantom radiographs on a transillumination image viewer with room lights off. The detectability was defined as the shortest length of the cylinders of which border the observers could recognize from the background, and was recorded using the number of columns. The detectability was calculated as the average of 10 readings for each observer, and plotted for different phantom diameter. The unweighted pair-group method using arithmetic averages (UPGMA) was adopted for clustering. The observers were clustered into two groups: one group selected objects with a demarcation from the vicinity, and the other group searched for the objects with their eyes constrained. This study showed a usefulness of the cluster method to select personnel with the similar perceptual predisposition when a C-D phantom was used in image quality control.}
doi = {10.1016/j.ejrad.2005.05.015}
journal = {European Journal of Radiology}
issue = {1}
volume = {57}
place = {Netherlands}
year = {2006}
month = {Jan}
}