The Value Of 64-slice Spiral CT Multi-direction Adjusted Multi-planar Reconstruction In Diagnosing Long Bone Diseases

Objective To evaluate the value of 64-slice spiral CT multi-direction adjusted multi-planar reconstruction (MPR) technique in diagnosing the diseases of long bone.Materials and Methods The clinical and imaging materials of 54 cases from Jan 2006 to Mar 2010 were collected at our hospital. All patients'pathological diagnoses information were obtained by surgical operation or biopsy. Male cases were 31 and female cases were 23, age range was 12~71 years old, with the average age was 31.9 years old. In the 54 cases, 16 cases were malignant tumors, 38 cases were benign tumors and tumor-like lesions. 14 cases were located in upper limb (11 in humerus, 2 in radius, 1 in ulna), and 23 cases were located in lower limb (23 in femur, 17 in tibia). All cases underwent X-ray plain films and 64-slice spiral CT using isotropic parameters, 32 cases underwent MRI scan. The multi-direction adjusted MPR were performed to display long-axial of lesions on coronal and sagittal planes using original data of CT. The diagnostic coincident rate with pathological results was compared with X-ray plain films, axial CT images, long-axial MPR and MRI.Results Multi-direction adjusted MPR accurately displayed the location,extent and degree of bony damage, changes in periosteum, tumor invasion to surrounding soft tissues and other important characters of long bone diseases, The coincident rate of multi-direction adjusted long-axial MPR imaging was 90.7%(49/54), which was higher than those of X-ray plain film 74.1%(40/54), axial CT 63%(34/54), and MRI 59.4%(19/32).The differences between above every two modalities were significant(χ2=16.003,Ρ<0.05).Conclusion (1) 64-slice spiral CT multi-direction adjusted long-axial MPR can demonstrate the growth ways,extent and degree involved of long bone diseases clearly, provide more information for the choice of clinical treatment ways, which can help to make correct diagnosis; (2) It has the advantages of X-ray plain film, axial CT and MRI, and is an ideal examination technique in diagnosing long bone lesions.