Application of a rapid quantitative instrument for irregular scars in forensic injury identification
Objective To develop an automatic measurement technology for measuring damage length and area,and develop an automatic forensic measurement equipment for injury,so as to realize the automation and intelligence of damage length and area measurement.Methods One-yuan coins and strips of different lengths or irregular shapes were cut from graph paper to simulate scars,and were sticked them on different parts of the volunteers'bodies as standard measures.A rapid quantitative instrument for irregular scars was used to measure the circumference and area of the research objects and the standards;SPSS was used to analyze the differences between the research objects'measurement data and the standard data.Results One-yuan coin measurement:The relative average deviations of the circumference value,area value,and diameter value measured by this technology were 0.03%,2.23%,and 8.76%,respectively.The diameter measurement value and the area measurement value were all smaller than the true value.The differences were statistically significant(t=5.725,2.585;all P<0.05).The circumference measurement was relatively accurate,and the difference from the true value was not statistically significant(t=0.036,P>0.05).In the 200 mm strip scar circumference measurement data,the forearm,thigh,and calf,the relative average deviation was smaller than the true value,and the differences were statistically significant(t=4.401,21.822,9.168;all P<0.05).In the measurement of the upper arm,it was closer to the true value,and the difference was not statistically significant(t=-2.109,P>0.05).It was larger in the upper arm measurement and smaller in the thigh measurement.The differences from the true values were statistically significant(t=-7.967,18.396;all P<0.05),which was closer to the true value in the measurement of forearm and calf,and the differences were not statistically significant(t=-0.489,-1.018;all P>0.05).For the 175 mm circumference triangular scar,in multiple groups of circumference and area measurements,the measurement of the upper limbs circumference was smaller than the true value.The difference was statistically significance(t=10.117,P<0.05).The chest and lower limbs were relatively accurate with the true values,and there were not statistically significant differences(t=1.851,1.097;all P>0.05).In the area measurement,the measured values of the upper limbs,chest and abdomen,and lower limbs were smaller than the true values,and the differences were statistically significant(t=6.275,5.148,3.729;all P<0.05).In the multiple sets of circumference measurement data of the"L"-shaped scar with a circumference of 220 mm,the measurement values of the upper limbs and chest were both smaller than those of the true value,and the measurement values of the lower limbs were larger.The differences were all statistically significant(t=11.699,18.701,-3.813;all P<0.05).In area measurement,the values of upper limbs and chest were smaller than those of the true values,and the measurement values of lower limbs were larger than that of the true value.The differences were all statistically significant(t=10.867,5.887,-13.755;all P<0.05).Conclusion The present rapid measuring device could accurately measure irregular scars and could be used in clinical practice,but the device was not suitable for measuring scars in areas of greater curvature.
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