Objective To evaluate the clinical application of diffusion-weighted MR of low field in hypera-cute cerebral infarction. Methods Conventional MRI and DWI on 0.35T were performed in 15 patients with highly suspicious hyperacute infarction within 6 hours after presenting symptoms. The coincidence between conventional MRI ,DWI and final clinical diagnosis was analyzed to compare the sensitivity and specificity of diagnosis among DWI,ADC and conventional MRI. Results 12 patients were diagnosed as hyperacute cerebral infarction, identical with final clinical diagnosis. 3 patients were negative on DWI ,who were finally diagnosed as TIA by clinical doctors.The high-intensity zone on DWI appeared infarction in following CT or MRI examination. The sensitivity and speci-ficity of DWI were both 100% ,and those of conventional MRI was 20% and 100% ,respectively. The infarctional region on DWI appeared high intensity and it was in low intensity on ADC maps. Conclusion DWI combined with ADC maps can be an important index in the diagnosis of hyperacute cerebral infarction. Its accuracy for diagnosis was high, which provides objective proofs for early clinical thrombolysis treatment.

Objective To investigate the value of four-dimensional color Doppler in diagnosis of fetal cleft lip and cleft palate.Methods The four-dimensional color Doppler for 24-28weeks of pregnancy in 13 548 pregnant women by prenatal ultrasound.Results Found 21 cases of fetal cleft lip and cleft palate,2 cases were missed,were confirmed.Conclusion Four dimensional color Doppler dynamic continuous observation of the fetal activity,plays an important role in diagnosis of fetal cleft lip and cleft palate and typing,which can increase the detection rate of fetal cleft lip and palate.