Objective To explore the value of MR T2WI-spectral attenuated inversion recovery(T2WI-SPAIR)sequence and dif-fusion tensor imaging(DTI)in the recovery process of vertebral compression fractures over time.Methods Three patients aged 60-75 years with a clear time and mechanism of injury were selected.They underwent conventional MR sequences and DTI scans at eight time points.The morphological and signal changes of the fractured vertebrae on T2WI-SPAIR sequences were dynamically observed.Statistical analysis was performed on the apparent diffusion coefficient(ADC)and fractional anisotropy(FA)of the fractured verte-brae and adjacent normal vertebrae.Results T2WI-SPAIR sequence showed that the vertebral morphology gradually worsened from the initial mild compression changes over time after vertebral fracture.Local bone collapse occurred at the upper edge of the verte-brae at>7-9 weeks,followed by stabilization.The initially diffuse and uniform high signal of the fractured vertebrae gradually changed a mixed signal,stabilizing around>9-12 weeks.Statistical analysis results revealed significant differences in ADC values between>1-2 weeks,>3-5 weeks,and>9-12 weeks post-fracture(P<0.05).Significant differences in FA values were also observed between≤1 week,>1-2 weeks,>3-5 weeks,>12 weeks,and>9-12 weeks post-fracture(P<0.05).Furthermore,ADC and FA values between the fractured and normal vertebrae also showed significant differences within the first 12 weeks post-fracture(P<0.05).Conclusion The T2WI-SPAIR sequence demonstrates specific patterns of morphological and signal changes dur-ing the recovery process of fractured vertebrae.Changes in DTI parameters,including ADC and FA values,in self-comparison within the fracture zone and comparison with normal regions,follow certain patterns.These findings can provide reliable imaging evidence for clinicians to make treatment decisions and estimate the time of vertebral injury.

Objective To explore the value of MR T2WI-spectral attenuated inversion recovery(T2WI-SPAIR)sequence and dif-fusion tensor imaging(DTI)in the recovery process of vertebral compression fractures over time.Methods Three patients aged 60-75 years with a clear time and mechanism of injury were selected.They underwent conventional MR sequences and DTI scans at eight time points.The morphological and signal changes of the fractured vertebrae on T2WI-SPAIR sequences were dynamically observed.Statistical analysis was performed on the apparent diffusion coefficient(ADC)and fractional anisotropy(FA)of the fractured verte-brae and adjacent normal vertebrae.Results T2WI-SPAIR sequence showed that the vertebral morphology gradually worsened from the initial mild compression changes over time after vertebral fracture.Local bone collapse occurred at the upper edge of the verte-brae at>7-9 weeks,followed by stabilization.The initially diffuse and uniform high signal of the fractured vertebrae gradually changed a mixed signal,stabilizing around>9-12 weeks.Statistical analysis results revealed significant differences in ADC values between>1-2 weeks,>3-5 weeks,and>9-12 weeks post-fracture(P<0.05).Significant differences in FA values were also observed between≤1 week,>1-2 weeks,>3-5 weeks,>12 weeks,and>9-12 weeks post-fracture(P<0.05).Furthermore,ADC and FA values between the fractured and normal vertebrae also showed significant differences within the first 12 weeks post-fracture(P<0.05).Conclusion The T2WI-SPAIR sequence demonstrates specific patterns of morphological and signal changes dur-ing the recovery process of fractured vertebrae.Changes in DTI parameters,including ADC and FA values,in self-comparison within the fracture zone and comparison with normal regions,follow certain patterns.These findings can provide reliable imaging evidence for clinicians to make treatment decisions and estimate the time of vertebral injury.

Objective To identify the features of 1H-magnetic resonance spectroscopy(1H-MRS) in patients with chronic obstructive pulmonary disease(COPD) of the hippocampus.Methods 32 patients with COPD randomly selected and 30 normal controls were selected.1H-MRS of the hippocampus was performed given to on all the subjects on hippocampus.The ratios of NAA/Cr and Cho/Cr were determined.Results In the bilateral hippocampus, the NAA/Cr ratio in patients with COPD demonstrated lower than that in normal controls(t=4.963,P=0.007 and t=4.856,P=0.023).The Cho/Cr ratio in patients with COPD showed higher than that in normal controls, the differences was were statistically significant(t=3.469,P=0.013 and t=3.019,P=0.047) Conclusion Abnormal metabolism of neurons on the hippocampus in patients with COPD is showed.

Objective To summarize the CT signs and clinic characteristics to improve the CT diagnoses ability on the lobar bronchial intraluminal cancer and provide a well comprehension for it.Methods To study the clinical symptom and CT presentation in 7 cases with the lobar bronchial intraluminal cancer which had been confirmed by bronchoscopy and pathologic exam.Results 3 cases were in right superior lobaris bronchus,1 case in right middle lobaris bronchus,3 cases in left superior lobaris bronchus.Obstructive pneumonia were found in 7 cases.Obstructive atelestasis in 5 cases.The nodules or emboluses within lobaris bronchus were showed by CT in all cases and the obstructive signs on each patient in its degrees. Conclusion To get the CT diagnosis of the lobar bronchial cancer is easily be delayed. But if pay attention and keep it a close combination with clinic, the early diagnosis will be attained on time.

Objective To study the HRCT appearances and diagnostic value of primary Sjgren’s syndrome ( pSS ) . Methods CT images of 12 cases of pSS were retrospectively analyzed . Results CT and HRCT scans showed pulmonary interstitial diseases in different degree mainly localized periphery of lung in all cases,the ground-glass opacity and interlobular septal thickening were preliminary features of pSS.Conclusion The ground-glass opacity of lung is active preliminary features of pSS,while the honeycombed lung is final feature of pSS.HRCT can help to determine the stage of pSS,and to estimate the prognosis in patients with pSS.