The Study Of Craniofacial MRI Soft Tissue Depth Measurement In Sheffield Adults

ObjectiveIn order to search a method which can locate craniofacial point precisely for the craniofacial soft tissue depth measurement, the MRI which has an image characteristics of high precision,resolution,organization contrast and the eFilm software which has a technology advantage of locating and measuring precisely are relyed on in this study. The artificial errors between different measurers will be reduced and the stability of measuring method will be increased, which can offer more dependable theoretical basis and data support to the craniofacial reconstrution working. Through the study of craniofacial soft tissue depth measurement in Sheffield adults, the variational rule is analysed which accumulates meaningful data to the related research on posture and facial features of Nodic especial Teuton.MethodsOn the premise of informed consent, 30 healthy men and 30 healthy women who have lived in Sheffield region all the time, parents are local whites, intermarriage within three generations, no genetic relationship between each other are extracted randomly. All the samples are scanned craniofacially at the same time by the designated professional technician through the same MRI in the method established by this study. The scan is high-density(each sample take 200 MRI images)and equidistant(1.2mm thickness) sagittal plain scan. The MRI images scanning from each sample are storaged in sequence under the rule that from right to left according to the human body direction, scan number ascending order for measuring. 12 bone traits on the human skull surface are selected in this study. Two students are extracted randomly from Liaoning Medical University Graduate Institute. In order to testing whether the results between different measurers are different, 20 samples are measured under the established method in this study by the three measurers with eFilm software. If no difference between the results of different measurers, the soft tissue depth measurement of all the samples is finished under the established method. The data will be statisticsed and analysed by the SPSS13.0 statistics software.ResultsThe results of the three measurers comparing with each other, it has no significant difference on each trait(p > 0.05). It has significant sexual difference(p < 0.05)on each trait except glabella and nasion(p > 0.05)among the selected 60 samples. Comparing with the mean from measurement results, the soft tissue depth values on 12 traits of men`s are larger than women`s. Comparing with each age group of samples, it has significant difference(p < 0.05)on each trait except glabella and nasion(p > 0.05). Comparing with the mean from measurement results, "two terminals low and middle high "rule exists on other 10 traits along with ageing change except orbital point and orbitale(p > 0.05). The peak value appears in 36-50 age group. It also exists a variational rule that the periorbital soft tissue depth becomes thinner and thinner along with ageing change. The peak value appears in 20-35 age group. Comparing with each age group of male and female, it has significant difference(p < 0.05)on each trait except glabella and nasion(p > 0.05). Comparing with the mean from measurement results, its variation rule is the same as the total samples. Human`s craniofacial can be divided into two parts by the horizontal plane which pass the nasal tip and parallel the Frankfurt horizontal plane. The top half of craniofacial soft tissue depth in Sheffield adults is usually more stable than the bottom half(the soft tissue depth values of the top half part are usually smaller than 8mm while the values of the bottom half part are often larger than 8mm), while the individual difference of the former is not so large as the latter. Conclusion1. The soft tissue depth measuring method based on the craniofacial bone traits which is detected in this study has perfect stability. It has no significant differences between results of different measurers`.2. It has significant differences on the midfacial and periorbital soft tissue depth between men and women in Sheffield adults. The soft tissue depth values of men`s are usually larger than women`s.3.The variation rule that midfacial soft tissue depth becomes thick first and thin last along with ageing change exists in Sheffield adults. The peak value appears in 36-50 age group. It also exists a variation rule that the periorbital soft tissue depth becomes thinner and thinner along with ageing change. The peak value appears in 20-35 age group.4.The top half of craniofacial soft tissue depth in Sheffield adults is usually more stable than the bottom half, while the individual difference of the former is not so large as the latter.