Objective To investigate the predictive value of early efficacy of neoadjuvant chemotherapy(NAC)in patient with breast cancer via full quantitative parameters of dynamic contrast-enhanced magnetic resonance imaging(DCE-MRI).Methods Forty patients with breast cancer were selected.The 18 fluorodeoxyglucose positron emission tomography/computed tomography(18F-FDG PET/CT)and DCE-MRI were performed before and after two cycles of NAC.According to the decrease rate of maximum standardized uptake value(ΔSUVmax)of PET/CT before and after two cycles of NAC,all patients were divided into two groups,including good response group(24 cases)(ΔSUVmax>40%)and general response group(16 cases)(ΔSUVmax≤40%).The changes of full quantitative parameters of DCE-MRI between the two groups were observed and analyzed.Results There were statistically significant differences in changes of Ktrans and Kep between the two groups(P<0.05),however,there was no significant difference in the change of Ve between the two groups(P>0.05).There was a significant positive correlation between ΔKtrans and ΔSUVmax(r=0.850,P<0.001).There was a high positive correlation between ΔKtrans and ΔKep(r=0.727,P<0.001).Conclusion The full quantitative parameters of DCE-MRI are helpful to evaluate the early efficacy of NAC in breast cancer,which can reflect the changes of microcirculation in the lesion,further reflect the therapeutic effect of NAC,guide the clinical optimization of treatment plan in time,and achieve accurate evaluation and individualized treatment.

Objective To investigate the MR signal intensity and spectroscopy characteristics of lumbar bone marrow in normal adult of Tibetan and Han nationality in high altitude.Methods According to the inclusion criteria,lumbar MRI examinations in Tibetan and Chinese volunteers(each 50 cases)were obtained.For each inspector,the lumbar 3 vertebra was selected,TFE sequence was used to measure the signal strength,T2map was used to measured the T2time,and 1H-MRS was used to measure the lumbar bone marrow spectrum signal.The measured data were statistically analyzed.Results Compared with the Han nationality in Xining area,T1-TFE sequence of Tibetan showed obvious low signal in the lumbar vertebra.The relative signal intensity were significantly different(P=0.001).For measurement of T2time,there was no significant differences(P=0.061).The spectrum analysis showed a line of low fat high water for Tibetan,and a line of low water high fat for Han nationality in Xining area.There were significant differences for water peak intensity,Width, Height and peak Area,but no significant differences in Lipid peak.There were significant differences(P<0.05)on Lipid water absorption ratio, fat water ratio,fat fraction between the two groups.Conclusion The Tibetan shows a low signal on T1WI sequence of lumbar spine which is considered in hypoxia condition for a long time,and the bone marrow red pulp associated with water content increased sig-nificantly.