Comparative Analysis of MRI Diagnosis and Multislice CT in the Diagnosis of Soft Tissue Tumors in Limbs

The purpose of this study was to compare and analyze the diagnostic applications of multisliecs spiral computed tomography(MSCT)and diffusively-weighted magnetic resonance imaging(MRI)in soft tissue tumors of extremities.A total of 104 patients with primary soft tissue tumors of limbs were selected for MSCT and MRI examination.MSCT values of various tumor types were compared during CT examination.In MRI detection,the diffusion sensitivity factor(b)of diffuse-weighted MRI was 0.500 s/mm2 to avoid as much as possible the bleeding,necrosis,scar and calcification heterogeneity components during operation.The maximum interest point was selected to observe the apparent diffusion coefficient(ADC)between benign and malignant tumors and muscle tissue.Results showed that among 104 patients,36 of patients were malignant and 68 of patients were benign.MSCT examination was consistent with pathology in 45 cases and MRI in 87 cases.In addition,the 59 of patients in MSCT examination and the 17 of patients in MRI were qualitative error and uncertainty.Soft tissue tumors on MSCT showed a low-density mass,and lipoma and cyst were specific.In MRI examination,T1WI and T2WI were significantly different in different types of tumors,while ADC values of malignant tumors were significantly lower than those of benign tumors and muscle tissues(P<0.01).However,there was no significant difference in ADC between benign tumor and muscle tissue(P>0.05).Therefore,MSCT can clearly show the soft tissue tumor lesions of the limbs and identify the relationship between them and the surrounding tissues.However,MSCT cannot make accurate characterization.MRI diffusivity weighted imaging can better differentiate benign from malignant and infer the histological origin of lesions.The detection level of MRI was significantly higher than that of CT,which was more consistent with pathology.Therefore,in the preoperative diagnosis of soft tissue tumors in limbs,MRI diffused-weighted imaging should be the first choice.

Different therapeutic proportion of patients undergone coronary angiography in the era of development in MSCT

Objective To study the different therapeutic proportion of the patient populations undergone coronary angiography(CAG)in the era of development in multislice spiral computed tomography(MSCT).Methods Two hundred and fifty four consecutive patients(mean age 59.24±10.65),who underwent CAG at Daxing Hospital from February 2007 through October 2007,were enrolled,160 patients were male and 94 were female.By evaluating from the coronary angiogram,the patients were not diagnosed to have coronary heart disease(CHD)with less than 50%diameter stenosis of coronary artery;the patients to have CHD with more than or equal to 50%stenosis of coronary artery;the patients were performed the procedure of percutaneous coronary intervention(PCI)with more than or equal to 70%stenosis;the patients were proposed to have coronary aortic bypass graft(CABG)surgery with left main coronary artery lesions or diffuse triple coronary artery lesions.Results In the 254 consecutive patients,59 patients(23.2%)had not been diagnosed to have CHD;195(76.8%)to have CHD,of these patients with CHD,49 patients(19.3%)were not indicated for PCI(including the patients receiving follow-up coronary angiography after stenting),81(31.9%)had been performed the procedure of stent implantation,57(22.4%)proposed to have CABG,8(3.1%)the procedure of PCI had not been successful,or had not been performed because of patients opposing to this therapy.Conclusion Multislice spiral computed tomography can be applied as a non-invasive screening tool to exclude the presence of CHD,to increase the positive proportion of the populations with CHD in all patients receiving coronary angiograhpy,to avoid the use of CAG in a subset of patients.