The technical investigation of 3.0T multi-modal quantitative MR imaging in rabbit liver / 实用放射学杂志

Objective To investigate the technical requirements for the 3.0T multi-modal quantitative MR imaging of the rabbit liver.Methods A total of 8 rabbits were scanned and T1 mapping,T2 mapping,MT and Gd EOB-DTPA dynamic enhancement images were acquired.For the dynamic enhanced scanning,injecting contrast medium was followed by saline flush with different combinations of injection flow rate (1.5 mL/s and 2 mL/s) and injection volume(6 mL and 8 mL).The quality of the images was assessed and analyzed statistically.Results The total scanning time was about 20-25 min.High-quality images were acquired by T1 mapping,T2 mapping and MT sequences.There was no significant difference in image quality among different groups in Gd-EOB-DTPA dynamic enhanced scanning(P＞0.05).Two rabbits died when the combination of injection flow rate of 2 mL/s and injection volume of 8 mL was used.Conclusion 3.0 T multi-modal quantitative MR scanning of rabbit liver can be achieved successfully if scanning parameters are properly chosen.

The Color Process Technique and Application of 3-D Images of Spiral CT / 实用放射学杂志

Objective To evaluate color process technioque and application of three-dimensional images coming from spiral CT and to improve the knowledge for color image.Methods The color process were differently applied in all 420 3-D images of spiral CT.Results All 420 images successfully were colored and printed.Conclusion 3-D color images can clearly display and differentiate tissue,organ and disease,it can supply more information for clinical diagnosis.

Clinical Application of Electron Beam Computed Tomography in the Diagnosis of Aortic Disease / 实用放射学杂志

Objective To evaluate the value of electron beam computed tomography (EBCT) angiography and three-dimensional reconstruction in the diagnosis of aortic aneurysm.Methods 31 patients(24 male,7 female) with aortic aneurysm were performed scanning by EBCT . The scanning methods were contrast enhanced single slice volume scanning(SVS) and continuous volume scan(CVS); the 3D reconstruction methods were multiple planar reconstruction (MPR), maximum intensity projection(MIP), shaded surface display(SSD) and volume rendering(VR).Results Of 31 aortic disease, 7 cases were aortic aneurysm, 19 cases were aortic dissection and 5 cases pseudoaneurysm. 9 patients were performed operation and the diagnosis of EBCT coincided well with the operative findings in all cases. Conclusion EBCT angiography can obtain high quality images. EBCT angiographic findings and 3D imagings are in helpful accurate diagnosis and direct surgical operation. The 3D images can directly show the shape and range of aortic aneurysm and the tears of the dissection of pseudoaneurysm. It may substitute conventional aortic angiography in the diagnosis of aortic disease.