Preliminary Application Study Into The Three-dimensional Reconstruction Of Magnetic Resonance Imaging Of The Normal Cruciate Ligament

Background:The knee joint is the most complex joint in human body. Because the special and important funcation, the cruciate ligaments of the knee are always important object of human anatomy. In the other hand, the knee is easily hurted because the anatomic structure and function. It is difficult io diagnose and treat when the cruciat ligament is hurted. It is important to diagnose the trauma of the cruciate ligament without hurt than before as the development of micro-hurted diagnose. It is difficult to diagnose the trauma of the cruiate by X ray and CT as the characteristics of the cruciate ligament. And the utilization of MR bring the new method in diagnoseing the trauma of the cruciate ligament. The image of MR provide some information of three dimensions, but we get the bidimensional image infact. It always make doctor difficult to observe the cruciate ligament directly, accurately and wholly. As the development of technical of computer, it is impossible to make the bidimensional image translate three diamensions. Our object is base on the research of other scholar. we utilize the MR image of normal human body to reconstrue three dimension image. We want to make sure the utilization of three dimensions reconstruction of the cruciate ligament in research of anatomy and clinic. Besides it can be useful in clinic and it provides a new idea for the diagnosis of the the cruciate ligament injury.Objective:To investigate the feasibility of the three dimentional reconstruction of MR and CT images of the normal cruciate ligament. MR and CT scanning of the the normal adults cruciate ligament was conducted. The three - dimensional reconstruction of these images was made by applying the reconstruction function of the Mimics 8.1. Furthermore we investigate the feasibility of the computer simulation of the operation of the reconstruction of the cruciate ligament.Methods:1. Subjects and collection of images(1) Between August in 2005 and October in 2006, MR and CT scanning of the the sixteen normal adults(without disease and injury in knees before) cruciate ligament was conducted.(2) Device: Siemens Somatom Sensation 1.5 T superacondution magnetic resonance and Siemens Somatom Sensation CT.(3) MR and CT scanning of the the knees of sixteen normal adults. The ambit is 10cm in centrage of the joint space.2. Three dimensions reconstruction of the cruciate ligament(1) We imput the MR image of the knee to the software of Mimics 8.1. Then image segmentation was made. Finally we obtain the three-dimendion model of the normal cruciate ligament.(2) We imput the CT image of the knee to the software of Mimics 8.1. Then we obtain the three-dimendion model of the normal femoris and tibia in knees.(3) To make the combination and the true-up position of the three-dimendion model of the normal cruciate ligament and the three-dimendion model of the normal femoris and tibia in software of Mimics 8.1.(4) To make the computer simulation of the operation of the reconstruction of the cruciate ligament and determin parameter.3. Analyze image of the three-dimendion model of the normal cruciate ligament and measure.We analyzed the situations of the three-dimendion model of the normal cruciate ligament. Then we measure the parameter of the normal cruciate ligament including the length of anteromedial margin, the length of posterolateral margin, the angle, the width, the thickness, the length of femoral tunnel, the length of tibial tunnel, the length of graft etc all by software.4. The experimental data was analyzed by the software of SPSS 13.0, and an associated probability of 5% (p≦0.05) was considered significant.Results:We could obtain satisfactory morphous and darity boundary in the three-dimendion model of the normal cruciate ligament and the three-dimendion model of the normal femoris and tibia. Neither we can measure the parameter of anatomy precision. We can remove dodge part and show the part we want to see by the lucidification. Finally we make the computer simulation of the operation of the reconstruction of the cruciate ligament and measure determin parameter.1. To compare between the three-dimendion model of the normal cruciate ligament and anatomy. We could obtain satisfactory morphous and darity boundary in the three-dimendion model of the normal cruciate ligament and the three-dimendion model of the normal femoris and tibia without distortion. And it is stereoacuity and three diamendions. we can observe it from any angle, roll it, remove dodge part and show the part we want to see by the lucidification.2. To observe and measure the anatomy parameter of the normal cruciate ligamentThe anterior cruciate ligament(ACL) lie from anterior intercondylar area of tibia and out anterior comu of lateral meniscus, line oblique aboral upper out, stop at medial aspect of lateral condyles of femur. The posterior cruciate ligament(PCL) lie from posterior intercondylar area, line oblique aboral upper anterior, stop at lateral aspect of medial condyle of the femur. To measure the anatomy parameter:a. the length and the angle of anteromedial margin of the ACL and PCL; b.the length and the angle of posterolateral margin of the ACL and PCL; c.the width and the thickness of the ACL and PCL. The experimental data was analyzed by the software of SPSS 13.0, and an associated probability of 5% (p≦0.05) was considered significant. There was little significant between in the three-dimendion model of the normal cruciate ligament and the public anatomy parameter(P＞0.05).3. To make the computer simulation of the operation of the reconstruction of the cruciate ligament and measure determin parameter.To measure the anatomy parameter: the length of femoral tunnel, the length of tibial tunnel, the length of graft etc all by software. The experimental data was analyzed by the software of SPSS 13.0, and an associated probability of 5% (p≦0.05) was considered significant. There was little significant between in the three-dimendion model of the normal cruciate ligament and the public anatomy parameter(P＞0.05). Conclusion:1. It is feasible to make the three - dimensional reconstruction of the the normal cruciate ligament and of the knee joint on the basis of the MR sectional images.We could obtain satisfactory morphous and darity boundary in the three-dimendion model of the normal cruciate ligament and the three-dimendion model of the normal femoris and tibia without distortion. And it is stereoacuity and three diamendions. we can observe it from any angle, roll it, remove dodge part and show the part we want to see by the lucidification.We make the combination and the true-up position of the three-dimendion model of the normal cruciate ligament and the three-dimendion model of the normal femoris and tibia in software of Mimics 8.1 to improve the quanlity of images.2. This method can be sure that the utilization of three dimensions reconstruction of the cruciate ligament in research of anatomy and in teaching.The reconstructed cruciate ligamen, femoris, tibia and meniscus had good morphology, similar to that of the anatomic structures. The three - dimensional images could be rotated in space, so the positional relationships among the fossa, the disc, the condyle and the mandible could be viewed clearly. Neither we can measure the parameter of anatomy precision, so it provides a new idea for the research of the cruciate ligament anatomy and in teaching of anatomy.3. This method can be useful in clinic and it provides a new idea for the diagnosis and teatment of the the cruciate ligament injury.We could obtain satisfactory morphous and darity boundary in the three-dimendion model of the normal cruciate ligament and the three-dimendion model of the normal femoris and tibia without distortion. And it is stereoacuity and three diamendions. we can observe it from any angle, roll it, remove dodge part and show the part we want to see by the lucidification. We can make the computer simulation of the operation of the reconstruction of the cruciate ligament and measure determin parameter. By the above conclusion, we can not only improve feasiblity and safe but also decrease the risk and complication of the operations.