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100 kVp Low-Tube Voltage Abdominal CT in Adults: Radiation Dose Reduction and Image Quality Comparison of 120 kVp Abdominal CT

100 kVp Low-Tube Voltage Abdominal CT in Adults: Radiation Dose Reduction and Image Quality Comparison of 120 kVp Abdominal CT

Authors :
Hong Il Ha
Seong Sook Hong
Min-Jeong Kim
Kwanseop Lee
Source :
대한영상의학회지, Vol 75, Iss 4, Pp 285-295 (2016)
Publication Year :
2016
Publisher :
The Korean Society of Radiology, 2016.

Abstract

Purpose To compare image quality and the effect of radiation dose reduction after decreasing tube voltage from 120 kVp to 100 kVp for abdominal CT in adults. Materials and Methods A total of 200 patients who underwent abdominal CT at 120 kVp (n = 100) or 100 kVp (n = 100) were enrolled. Automatic tube current modulation was applied with other scan parameters being constant. Radiation dose was calculated based on CT dosimetry index. The image quality of abdominal organs and image noise were assessed quantitatively and qualitatively. Results A radiation dose reduction of 13.3% was found in the 100 kVp group. On quantitative analysis, image noise was increased up to 47% in the 100 kVp group. CT numbers of liver, pancreas, renal cortex, aorta, portal vein, and psoas muscle in the 100 kVp group were significantly (p < 0.05) higher than those in the 120 kVp group. Signal-to-noise ratio was significantly higher (p < 0.05) in the 120 kVp group. Contrast-to-noise ratio (CNR) of the liver was higher in the 120 kVp group. However, no significant (p > 0.05) difference was observed in the CNR of other organs between the two groups. On qualitative analysis, noise texture of abdominal organs, artifact, and diagnostic acceptability were not significantly (p > 0.05) different. Conclusion 100 kVp abdominal CT reduced radiation dose by 13.3% without sacrificing image quality compared to 120 kVp abdominal CT.

Details

Language :
English, Korean
ISSN :
17382637 and 22882928
Volume :
75
Issue :
4
Database :
Directory of Open Access Journals
Journal :
대한영상의학회지
Publication Type :
Academic Journal
Accession number :
edsdoj.1917d95c12d45998d19a2b666d4b6ff
Document Type :
article
Full Text :
https://doi.org/10.3348/jksr.2016.75.4.285