An automated method for comparing motion artifacts in cine four-dimensional computed tomography images.

Cui, Guoqiang

Jew, Brian

Hong, Julian C

Johnston, Eric W

Loo, Billy W

Maxim, Peter G

2019-07-09T11:37:29Z

2019-07-09T11:37:29Z

2012-11-08

2019-07-09T11:37:28Z

The aim of this study is to develop an automated method to objectively compare motion artifacts in two four-dimensional computed tomography (4D CT) image sets, and identify the one that would appear to human observers with fewer or smaller artifacts. Our proposed method is based on the difference of the normalized correlation coefficients between edge slices at couch transitions, which we hypothesize may be a suitable metric to identify motion artifacts. We evaluated our method using ten pairs of 4D CT image sets that showed subtle differences in artifacts between images in a pair, which were identifiable by human observers. One set of 4D CT images was sorted using breathing traces in which our clinically implemented 4D CT sorting software miscalculated the respiratory phase, which expectedly led to artifacts in the images. The other set of images consisted of the same images; however, these were sorted using the same breathing traces but with corrected phases. Next we calculated the normalized correlation coefficients between edge slices at all couch transitions for all respiratory phases in both image sets to evaluate for motion artifacts. For nine image set pairs, our method identified the 4D CT sets sorted using the breathing traces with the corrected respiratory phase to result in images with fewer or smaller artifacts, whereas for one image pair, no difference was noted. Two observers independently assessed the accuracy of our method. Both observers identified 9 image sets that were sorted using the breathing traces with corrected respiratory phase as having fewer or smaller artifacts. In summary, using the 4D CT data of ten pairs of 4D CT image sets, we have demonstrated proof of principle that our method is able to replicate the results of two human observers in identifying the image set with fewer or smaller artifacts.

1526-9914

1526-9914

https://hdl.handle.net/10161/19086

eng

Wiley

Journal of applied clinical medical physics

10.1120/jacmp.v13i6.3838

Humans

Radiographic Image Interpretation, Computer-Assisted

Observer Variation

Artifacts

Respiratory Mechanics

Algorithms

Motion

Automation

Four-Dimensional Computed Tomography

An automated method for comparing motion artifacts in cine four-dimensional computed tomography images.

Journal article

Cui, Guoqiang|0000-0002-6607-3830

Hong, Julian C|0000-0001-5172-6889

3838

6

Staff

Duke

Radiation Oncology

Clinical Science Departments

School of Medicine

Published

13