Objective To explore the diagnostic value of intravoxel incoherent motion diffusion-weighted imaging(IVIM-DWI)in diagnosis of different pathological types of lung cancer.Methods 45 patients were performed traditional MR and multi-b value DWI scan by GE discovery 750 MR.The values of Slow-ADC,Fast-ADC and ffast measured on a AW4.5 workstation were analyzed between the different pathological types of lung cancers.The correlations between these IVIM-DWI parameters and the serum tumor markers of lung cancer were analyzed.The diagnostic efficiency of these parameters were evaluated by receiver operator characteristic curve (ROC).Results 27 cases NSCLC(13 cases squamous carcinoma;14 cases adenocarcinoma )and 18 cases SCLC were finally included in this study.There were significant differences in Slow-ADC values between SCLC group and NSCLC group (P =0.00),the adenocarcinoma group (P=0.03),the squamous carcinoma group(P=0.01).There were no significant difference in Fast-ADC as well as ffast value between any two groups.The AUC of Slow-ADC value was 0.874.There existed negative correlation between squamous cell carcinoma antigen(SCC-Ag)of squamous carcinoma group and Slow-ADC(r=-0.730).Conclusion The Slow-ADC of IVIM-DWI parameters is useful in differential diagnosis of NSCLC and SCLC,which has the largest diagnostic efficiency.The correlation between SCC-Ag and Slow-ADC value has a certain meaning in diagnosing different pathological types of lung cancers.

The incidence of rectal cancer gradually increased in our country in recent years.Preoperative imaging methods are used to accurately display the lesions of rectal cancer,providing accurate quantitative diagnostic information,therefore being important to formulate reasonable and individualized therapy clinically.Intra-voxel incoherent motion (IVIM) is a multi parameter imaging technology.IVIM can provide the diffusion and perfusion information from the molecular level.Theoretically,the microstructure information of internal rectal cancer cell density and the vascular density,and the tumor cell metabolism can be displayed quantitatively with IVIM imaging,which can reflect the heterogeneity of the tumor and its degree during different periods.The application status and the future development of IVIM technique in management of rectal cancer were reviewed in this article.