Assessing response of myeloma bone disease with diffusion-weighted MRI

Area of Science:

• Radiology
• Oncology
• Biomedical Imaging

Background:

• Multiple myeloma is a hematologic malignancy affecting plasma cells.
• Accurate monitoring of treatment response and disease status is crucial for patient management.
• Diffusion-weighted MRI offers a non-invasive method to assess tissue microstructure.

Purpose of the Study:

• To quantify apparent diffusion coefficient (ADC) values in active multiple myeloma and remission.
• To evaluate changes in ADC in patients responding to or progressing on treatment.
• To explore the relationship between marrow fat changes and ADC variations.

Main Methods:

• Recruitment of 20 patients with multiple myeloma.
• Performance of various MRI sequences including diffusion-weighted and Dixon imaging.
• Serial MRI scans at baseline, 4-6 weeks, and 20 weeks.

Main Results:

• Significantly higher ADC values were observed in active myeloma compared to remission (p=0.047).
• Responders showed a significant increase in ADC at 4-6 weeks (p=0.005).
• A strong correlation (p<0.001) was found between changes in fat fraction and ADC values.

Conclusions:

• ADC values can differentiate active myeloma from remission.
• Diffusion-weighted MRI can potentially quantify disease transition and treatment response.
• Changes in marrow fat influence ADC variations during treatment.