Whole-body diffusion-weighted magnetic resonance imaging with apparent diffusion coefficient mapping for staging...

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Diffuse large B-cell lymphoma (DLBCL) staging relies on accurate lesion detection.
• Current imaging modalities have limitations in sensitivity and specificity for comprehensive staging.

Purpose of the Study:

• To develop and evaluate a whole-body diffusion-weighted imaging (DWI) MRI protocol for DLBCL staging.
• To assess the efficacy of DWI in detecting lymph node and organ involvement compared to FDG PET/CT.

Main Methods:

• A cohort of 15 DLBCL patients underwent whole-body DWI and FDG PET/CT for pretreatment staging.
• Lymph node and organ involvement were assessed using qualitative and quantitative DWI, including apparent diffusion coefficient (ADC) measurements.

Main Results:

• DWI demonstrated high concordance with PET/CT for lymph node involvement (94%), with sensitivity of 90% and specificity of 94%.
• Combining visual ADC analysis with size criteria improved specificity to 100% for lymph node detection.
• Excellent agreement (100%) was observed for organ involvement, with all involved organs showing restricted diffusion on DWI.
• Ann Arbor staging concordance between DWI and PET/CT was high at 93%.

Conclusions:

• Whole-body DWI with ADC analysis is a potentially valuable tool for lesion detection and staging in DLBCL patients.
• This MRI technique offers a promising alternative or adjunct to conventional staging methods.