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KMID : 1131320150170010093
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.93 ~ p.99
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Comparison and evaluation of Image quality in Neck CT : Reformed Coronal images versus Direct Coronal i
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Lee Sung-Yeong
Kang Han-Sol
Lee Ki-Baek
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Abstract
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Purpose : Direct coronal (DC) images of neck CT scan is used to reduce metal artifact due to prostheses for dentistry. Additional scan is needed for getting coronal images and it leads to increase of patient dose. The purpose of this study was to compare DC and Reformatted coronal (RC) images in order to peform optimal neck CT examination.
Materials and Methods : 20 patients were performed neck CT with Lightspeed VCT 64 (GE Healthcare, waukesha, U.S.A.) and DC images were acquired. SNR of DC and RC images were measured and compared for quantitative evaluation, and qualitative evaluation was also taken by scoring about metal artifact.
Results : As a result of quantitative evaluation, average SNR of RC images was 6.8 and DC’s SNR was 3.9. RC’s SNR was 60% higher than DC’s SNR. In a result of qualitative evaluation for this study, average score of DC was 4.1 and RC’s was 1.9. The score means that metal artifact was dramatically reduced in DC images.
Conclusion : DC images are effective for reducing metal artifact caused by prostheses for dentistry. However, RC is also recommended when metal artifact is not occurred because patient dose is a important point to be considered.
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KEYWORD
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Direct coronal images, Reformatted coronal image, Metal artifact, Neck CT
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