| Objective: to study the regularity of the body fat composition and distribution of Chinese obesity and healthy persons by DEXA in an attempt to explore the diagnosis index of the obesity determined by DEXA and provide an approach for the obesity diagnosis on the basis of medical imaging studies. Material & Method: pork was the subject of the animal experiment,dividing into Sample 1 and Sample 2, which were easily incised into the fat part and the lean part (the weight of S1 was 2531 grams, S2 2533 grams). The subject of the study was divided into two groups, the obesity group and the control group. There were 135 cases in the obesity group diagnosed by their BMI in the First Affiliate Hospital of Guangxi Medical University during the period of March 2002 to December 2003.Among them, there were 69 male patients, with average age of 63.54±15.30, height of 167.00±5.47cm, and weight of 75.88±7.84kg , while the female were 66 with average age of 58.35±9.51, height of 155.33±5.93 cm, weight of 66.05±9.04kg. There were 75 persons in the control group from the crowd of healthy outpatient (normal BMI) who came to have a routine check-up in the First Affiliate Hospital of Guangxi Medical University. Among them, there were 46 male persons, with average age of 58.24±19.5,height of 167.65±5.71cm, weight of 63.11±6.64kg, while the female were 29 with average age of 57.62±11.68, height of 156.64±6.76 cm, weight of 52.18±6.97kg.. The DEXA device was " Lunar PLODIGY" bone densitometry. Put the pork sample on the treatment table to have a DEXA scan, with scanner over the upward to the downward by standard mode. After the scanning, the sample were incised and separated into fat part and lean one by a surgical knife, of which were weighed three times respectively by an electronic scale and got the average weight of each. Used the medical body height and weight measuring instrument to carry height and weight on the routine measurement, simultaneously calculated the BMI= body weight (kg)/the height2 (m2). Make the subject lie flat on the treatment table and make a DEXA scan in a standard mode, while the scanner moved over the head side to the leg side within five minutes, recording the total and local parameters (the fat composition, the lean, the BMD and BMC of the arm, leg, trunk and total body). The present study included the following items: ①to examine the diagnosing ability by DEXA between the fat and non-fat composition; ②to obtain some DEXA statistic data of the body fat and nonfat composition and distribution in the healthy subject population of different age and sex; ③to obtain some DEXA statistic data of the body fat and nonfat composition and distribution in the patient subject population of different age and sex in an attempt to explore the diagnosing index of obesity determined by DEXA; ④to examine the correlation between fat composition and distribution and the bone mineral content in the control group and obesity group. Result: 1. As the results of the animal sample experiment show, the total quantity of the sample 1 measured by DEXA and the electronic scale respectively are 2520 gram and 2511 grams, and the difference rate are 0.36%; the fat quantity of sample 1 respectively are 1220 grams and 1166 grams, and the difference rate is 4.4%; the lean quantity of sample 1 respectively are 1294 grams and 1345 gram, and the difference rate is 3.8%; two methods to sample 2 the total quantity measurement respectively are 2547 gram and 2533 grams, and the difference rate are 0.55%; the fat quantity of sample 2 respectively are 914 grams and 871 grams, and the difference rate is 4.7%; the lean quantity of sample 1 respectively are 1626 grams and 1662 gram, and the difference rate is 2.2%. 2. All 210 subjects were weighed both by DEXA and the platform scale, with a result of 66.71±10.97kg and 66.62±10.91kg respectively. As the t-test shows, there is no significant difference between the two methods (p=0.93, p>0.05). 3. The fat content of the arm, leg, trunk and total body of female in the... |
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