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The Relationship between Subjective and Objective Parameters in CT Phantom Image Evaluation

Cited 10 time in Web of Science Cited 9 time in Scopus
Authors

Park, Hye Jung; Jung, Seung Eun; Lee, Young Joon; Cho, Woo Il; Kim, Seung Hyup; Kim, Ki Hwang; Do, Kyung Hyun

Issue Date
2009-10
Publisher
KOREAN RADIOLOGICAL SOC
Citation
KOREAN JOURNAL OF RADIOLOGY; Vol.10 5; 490-495
Keywords
Computed tomography (CT)Phantomsimage quality
Abstract
Objective: To evaluate whether there is a relationship between subjective parameters determined by a reviewer (spatial resolution, low contrast resolution, and artifacts) and objective parameters (the CT number of water, noise, and image uniformity) in CT phantom image evaluations. Materials and Methods: We reviewed the CT results of phantom image evaluations conducted by Korean Institute for Accreditation of Medical Image (KIAMI) from May 2007 to June 2007. We compared the objective parameters against the pass or fail groups for the subjective parameters. We also evaluated whether there is a relationship between the artifact types and the other subjective parameters. Results: The mean noise value was significantly higher in the fail groups for the subjective parameters compared to the pass groups (p = 0.006). Specifically, noise and low contrast resolution were found to have a statistically significant positive correlation (r = 0. 183, p < 0.001). In the fail group for low contrast resolution, the failure due to artifacts was significantly higher than the pass group (p < 0.001). In contrast, no statistically significant differences were found for the mean CT number of water, noise, or image uniformity based on the types of artifacts. Conclusion: Subjective CT image parameters evaluated by a reviewer correlate with objectively measured parameters, especially noise. Therefore, a stricter noise standard might be able to improve the subjective parameters results, such as low contrast resolution.
ISSN
1229-6929
Language
English
URI
https://hdl.handle.net/10371/78105
DOI
https://doi.org/10.3348/kjr.2009.10.5.490
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