[Whole-body MRI and FDG-PET/CT imaging diagnostics in oncology]

Area of Science:

• Oncologic Imaging
• Radiology
• Medical Physics

Context:

• Whole-body MRI (WB-MRI) represents a paradigm shift from traditional sequential imaging in oncology.
• Advancements in hardware (1.5T and 3T scanners) and acquisition techniques have made WB-MRI clinically viable.
• WB-MRI integrates detailed organ assessment with whole-body coverage, offering superior soft tissue contrast and dynamic information.

Purpose:

• To review recent developments and applications of WB-MRI in oncologic imaging.
• To compare the efficacy of WB-MRI with PET/CT in cancer staging and detection.
• To highlight the advantages of WB-MRI, including its sensitivity for distant metastases and its utility as a radiation-free alternative.

Summary:

• WB-MRI provides comprehensive anatomic coverage with high spatial resolution and contrast dynamics.
• PET/CT offers valuable metabolic information for assessing tumor viability and lymphatic spread.
• Whole-body MR diffusion imaging shows promise for enhanced tumor detection, and WB-MRI demonstrates high sensitivity for metastases in the liver, bone, and brain, outperforming PET/CT in these areas.
• WB-MRI is particularly advantageous for pediatric oncology due to its radiation-free nature and precise bone marrow assessment, proving highly accurate for hematologic diseases like multiple myeloma.

Impact:

• WB-MRI offers a sensitive, radiation-free alternative for cancer staging and follow-up, especially in pediatric patients.
• It enhances the detection of distant metastases compared to PET/CT, particularly for specific tumor types and locations.
• The technology provides precise bone marrow assessment, crucial for staging hematologic malignancies.