Analysis of Image Quality of Diffusion Weighted Imaging in Liver Lesions / 实用放射学杂志

ABSTRACT

Objective To investigate the correlation between b value and image quality of diffusion weighted imaging(DWI).Methods DWI was performed in 20 healthy volunteers and 60 patients with liver lesions.Signal to noise ratio ( SNR ) and contrast to noise ratio ( CNR ) were calculated . Results The mean SNR was larger than 5 when b value was 100 s/mm2 or 300 s/mm2, while b value was 600 s/mm2 or 1100 s/mm2, SNR was less than 5. With b value increased, the influence of blood supply on ADC decreased, but the artifacts increased and CNR decreased, CNR of cystic lesions decrease more than that of solid lesions.Conclusion The gradient factor(b)between 300 s/mm2 and 600 s/mm2 is the most suitable in DWI.