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Magnetic resonance imaging in diffuse malignant bone marrow diseases.

R Nyman, S Rehn, B Glimelius

    Acta Radiologica (Stockholm, Sweden : 1987)
    |March 1, 1987
    PubMed
    Summary

    Magnetic resonance imaging (MRI) can assess bone marrow cellularity by measuring longitudinal relaxation time (T1). However, MRI cannot differentiate between various bone marrow disorders with similar cellularity levels.

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    Area of Science:

    • Radiology
    • Oncology
    • Hematology

    Background:

    • Bone marrow disorders, including malignant involvement and polycythemia vera, alter marrow cellularity.
    • Assessing bone marrow cellularity is crucial for diagnosis and treatment monitoring.

    Purpose of the Study:

    • To evaluate the utility of spin-echo magnetic resonance imaging (MRI) in assessing bone marrow cellularity.
    • To determine if MRI can differentiate between various bone marrow pathologies based on relaxation times.

    Main Methods:

    • Spin-echo MRI was performed at 0.35 T and 0.5 T on patients with malignant bone marrow involvement, polycythemia vera, reactive bone marrow, and healthy individuals.
    • Longitudinal relaxation time (T1) and transverse relaxation time (T2) were measured and correlated with histological assessment of bone marrow cellularity.

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  • Normalized image intensities were also analyzed to characterize tissues.

    • Main Results:

    • Increased T1 relaxation times were observed in malignant, polycythemia vera, and reactive bone marrow compared to normal marrow.
    • Shortened T1 was noted in radiation-treated hypocellular bone marrow.
    • T1 and T2 relaxation times strongly correlated with bone marrow cellularity.
    • Neither T1 nor T2 could differentiate between various malignancies or between malignant and reactive marrow at high cellularity.

    Conclusions:

    • MRI is a valuable tool for assessing bone marrow cellularity.
    • MRI cannot reliably differentiate between different bone marrow disorders when cellularity is similar.