Effect of an advanced model-based iterative reconstruction algorithm on texture and visual impression of images privieded by a dual source CT scanner
Purpose: To evaluate the influence of ADMIRE algorithm on image texture and image visual impression as a supplement to measurements of common image quality parameters such as noise levels and spatial resolution. Methods: An ACR phantom was examined at different radiation dose levels. To characterize...
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Main Authors | , , , , |
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Format | Journal Article |
Language | English |
Published |
14.09.2018
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Subjects | |
Online Access | Get full text |
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Summary: | Purpose: To evaluate the influence of ADMIRE algorithm on image texture and
image visual impression as a supplement to measurements of common image quality
parameters such as noise levels and spatial resolution. Methods: An ACR phantom
was examined at different radiation dose levels. To characterize the image
texture, two Haralick texture parameters, contrast and entropy, for different
dose level and reconstruction algorithms were assessed. The visual impression
of images and their structural differences were evaluated using the structural
similarity index (SSIM). Noise was determined for all dose and AMIRE levels and
compared to those by filtered back projection (FBP). The spatial resolution was
determined by the modulation transfer functions and the line spread function.
Results: The Haralick texture parameters decreased with increasing ADMIRE
levels I up to V. ADMIRE III, IV and V offered a comparable contrast and
entropy to those calculated by FBP with a radiation dose reduction up to 50%.
SSIM improved with increasing ADMIRE levels. SSIM calculated by ADMIRE IV and V
showed similar values by the filter back projection with a dose decrease up to
50%. Spatial resolution was retained up to 90% dose reduction. With increasing
ADMIRE as well as dose level the noise distribution shifted to a more narrow
distribution, which was in accordance with the reconstructed images using
ADMIRE. Conclusion: Texture analysis and SSIM allow a more realistic assessment
of the dose reduction potential of iterative reconstruction algorithms than
quality metrics only based on physical measurements of noise distribution or
spatial resolution. This work presented that by means of the ADMIRE algorithm,
a comparable image quality at reduced radiation doses can be reached. |
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DOI: | 10.48550/arxiv.1809.05313 |