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KMID : 1131320160180010077
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Journal of Korean Society of Computed Tomographic Technology
2016 Volume.18 No. 1 p.77 ~ p.85
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A Study on the Standardization of Respiratory Function in Estimating Fat Amount Ratio with Computed Tomography
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KIm Seo-Hyeon
Yoo Ji-Eun
Gwon Sun-Ahn
Min Kwan-Hong
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Abstract
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Purpose : To suggests the standardization of respiratory function and how Abdomen Fat CT examination influences on the diagnosis of obesity variation depending on respiration.
Materials and methods : The target was 40 adults of Abdomen Fat CT examination was performed among the adults visited the above hospital for March 2015 ~ May 2015. Experimental group was divided into 4 subgroups according to Body Mass Index (BMI) to scan the inspiration image and expiration image for 2 times of Fat CT with CT such as Brilliance iCT(256 slice MDCT, Philips healthcare, Cleveland, OH, USA) and to let the subgroups breath from the abdomen. For the examination, the author lets scan covered L4~6 on the basis of Umbilicus and estimated BMI with Aquarius iNtuition Version 4.4(A workstation) and IntelliSpace Portal(ISP) Version 4.0(B workstation) to calculated VFA, VFA, VSR (Visceral vs. Subcutaneous Fat Rate). Also, the author compared and analyzed the images with a statistic program such as SPSS/WIN 21.0 and T-test, and determined that the result related to the images were significant statistically in case the result was p<0.5.
Results : 1. A workstation : In underweight group, VFA reduced 21.9±17.8㎠ (21.9±13.9%)(p<0.05). SFA increased -3.2±8.3㎠ (3.8±9.3%), the difference was not significant, VSR decreased 0.28 ±0.26㎠ (23.9±16.9%)(p<0.05). In normal weight group, VFA decreased 21.7±7.1㎠ (19.4± 8.4%)(p<0.05), SFA increased -1.5±6.4㎠ (1.3±8.9%), the difference was not significant, VSR decreased 0.21±0.1㎠ (21.4±9.2%) (p<0.05).In overweight group, VFA decreased 21.2±21.9 ㎠(15.2±16.2%)(p<0.05), SFA increased -0.4±3.5㎠(0.1±3.1%), VSR decreased 0.16±0.22㎠ (14.9±18.3%), the difference was not significant. In obesity and extreme obesity group, VFA decreased 25.7±21.3㎠ (14.8±11.9%)(p<0.001), SFA increased -0.7±7.7㎠ (0.6±3.3%), the difference was not significant, VSR decreased 0.17±0.15㎠ (15.1±13.2%)(p<0.001).
2. B workstation : In underweight group, VFA decreased 43.9±40.5cc (24.4±13.3%)(p<0.05), SFA increased -9.5±8.7cc (4.2±3.1%), the difference was not significant, VSR decreased 0.28 ±0.27cc (27.2±14.7%)(p<0.05). In normal weight group, VFA decreased 47.0±12.9cc(22.9 ±6.7%)(p<0.05), SFA increased -12.2±3.3cc (3.9±0.9%), the difference was significant, VSR decreased 0.23±0.14cc (23.5±7.5%)(p<0.05).In overweight group, VFA decreased 49.4±36.8cc (19.0±12.8%)(p<0.001), SFA increased -15.5±6.9cc (5.4±4.3%) (p<0.01), VSR decreased 0.20 ±0.15cc (23.0±12.8%)(p<0.01).In obesity and extreme obesity group, VFA decreased 58.0 ±49.9cc (16.4±10.9%)(p<0.05), SFA increased -10.7±16.2cc (2.6±2.9%) (p<0.001), VSR decreased 0.18±0.15cc (18.4±12.1%)(p<0.001).
Conclusion : In estimating BMI of profile images for 4 groups in accordance with BMI, VFA showed a significant percentage as 18.4% (p<0.05), and SFA showed an insignificant percentage as 1.45% during inspiration period and expiration period. In estimating BMI of volume image, VFA showed a significant percentage as 20.7% (p<0.05), and SFA showed 2 insignificant percentages as 4.2% and 3.9%, respectively, in underweight group and normal weight group during inspiration period and expiration period. Also, in overweight group and extreme obesity group, VFA and SFA showed 2 insignificant percentages as 5.4% and 2.6%, respectively, during inspiration period and expiration period (p<0.01). In estimating BMI with Abdomen Fat CT, VFA was more decreased during expiration period than during inspiration period. Therefore, the standardization of respiratory function is required by all means for exact BMI estimation.
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KEYWORD
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domen Fat CT, VFA (Viscera Fat Area), SFA (Subcutaneous Fat Area)
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