The preliminary study of the suitable b value in diffusion weighted imaging of lung cancer with 1.5T MR / 实用放射学杂志

ABSTRACT

Objective To determine reasonable b values in diffusion weighted imaging of lung cancer with 1.5T MR.Methods 30 patients with lung cancer received DWI of the chest using a single shot EPI-SE pulse sequence with different b values(500 s/mm2 , 600 s/mm2 ,800 s/mm2 ,1 000 s/mm2 ),and the ADC values of the lesion were measured.The image quality of each group of DWI and ADC were analyzed and compared.Results The images of DWI and ADC of 30 patients were all captured clearly,and ADC val-ues of lesions were measured too.As b values increasing from 500 s/mm2 to 1 000 s/mm2 ,SNR of lung tissue and lesion decreased gradually.When b value was 600 s/mm2 ,the ADC value was highest,and then decreased gradually.When b value was500 s/mm2 , the reference rang of ADC value was stable too.Conclusion When b value is 600 s/mm2 ,the image quality of DWI and ADC map of lung cancer is satisfying with SNR and CNR,and this would provide accuracy information for lesion changing.