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Related Experiment Videos

Early and late bone-marrow changes after irradiation: MR evaluation.

S K Stevens1, S G Moore, I D Kaplan

  • 1Department of Diagnostic Radiology, Felix Bloch Laboratory, Stanford University Medical Center, CA 94305-5105.

AJR. American Journal of Roentgenology
|April 1, 1990
PubMed
Summary

Magnetic resonance imaging (MRI) can detect early radiation-induced bone marrow changes within two weeks of therapy. Distinct late marrow patterns emerge 6 weeks to 14 months post-treatment, aiding in differentiating radiation effects from other abnormalities.

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Area of Science:

  • Radiology
  • Oncology
  • Medical Imaging

Background:

  • Understanding bone marrow changes after radiation therapy is crucial for accurate diagnosis.
  • Differentiating post-radiation changes from other marrow abnormalities is clinically significant.

Purpose of the Study:

  • To investigate the chronologic evolution of bone marrow changes using MRI during and after radiation therapy.
  • To establish MRI criteria for identifying normal post-radiation marrow changes.

Main Methods:

  • Serial spin-echo and short-T1 inversion-recovery (STIR) MRI scans were performed on 14 patients.
  • Imaging was conducted before, weekly during, and monthly up to 14 months after radiation therapy (1500-5000 rad).
  • Patients received treatment for Hodgkin disease, seminoma, or prostate carcinoma.

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Main Results:

  • Early changes (first 2 weeks) included increased STIR signal intensity, indicating edema and necrosis.
  • Between weeks 3-6, heterogeneous marrow signals and prominent central fat were observed on T1-weighted images.
  • Late patterns (6 weeks-14 months) showed either homogeneous fatty replacement or a peripheral intermediate signal band.

Conclusions:

  • MRI can detect radiation-induced bone marrow changes as early as 2 weeks after therapy initiation.
  • At least two distinct late marrow MRI patterns were identified.
  • Absence of focal lesions or soft-tissue edema during therapy suggests radiation changes; their presence may indicate other pathologies.