Comparison of magnetic resonance whole body diffusion weighted imaging with FS-T2WI and FDG-PET/CT for initial staging and detection of lesion in newly diagnosed lymphoma

Abstract

Objective: To compare the application value of magnetic resonance whole body diffusion weighted ima-ging(MR WB-DWI) combined with FS-T2WI sequence and PET/CT in detection of disease lesion and staging in newly dia-gnosed lymphoma. Methods: A total of 25 patients with newly diagnosed lymphoma and without a history of treatment for lymphoma admitted to Department of Hematology in Shanghai Ruijin Hospital from May 2014 to September 2020 were retrospectively analyzed. All the patients were histologically confirmed, including 24 cases of non-Hodgkin lymphoma and 1case of Hodgkin lymphoma. MR WB-DWI with FS-T2WI and 18F-FDG PET/CT were performed and coincidence of results between the two techniques in lesion detection and disease staging were compared. The clinical criterion was taken as the gold standard (comprehensive analysis of clinical, pathological, imaging, bone marrow puncture and 6-month follow-up results, referring to Ann-Arbor staging method). Results: Results of WB-DWI with FS-T2WI in 466 node regions out of 500 areas were congruen with those of PET/CT (K=0.807, P>0.05), there were no significant difference between two techniques in detection of intranodal lesions. The two imaging techniques agreed on 444 organs out of 450 organs analyzed (K=0.857, P>0.05). The stages based on WB-DWI with FS-T2WI was concordant with those of PET/CT in 20 patients out of 25 patients (K=0.731, P>0.05). Compared with clinical stage, PET/CT underestimated disease stage in 3 cases and WB-DWI combined with FS-T2WI underestimated disease in 2 cases. Conclusions: WB-DWI combined FS-T2WI sequence have high consistency with 18F-FDG PET/CT in lesions detection and disease staging in newly diagnosed lymphoma, and could serve as a suppliment of PET/CT.

Keywords

• |whole body-diffusion weighted imaging|pet/ct|lymphoma|staging diagnosis