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Abstract
Magnetic Resonance Imaging (MRI) is the first non-invasive means of evaluating medullary bone. Conventional roentgenography provides only indirect evidence of marrow disease, through changes in the bony cortex and trabeculae. CT scanning does not adequately discriminate among the medullary soft tissues. The exquisite contrast resolution offered by MRI allows visualization of most elements of the marrow as well as identification of its nonmineralized components.
Unlike these modalities, magnetic resonance (MR) imaging lias the major benefit of imaging bone marrow directly. Multiplanar, MR imaging provide the excellent spatial and contrast resolution necessary to differentiate the signal intensities of fatty (yellow) marrow elements from hematopoietic (red) marrow elements. Magnetic resonance imaging may thus become the diagnostic gold standard for diseases that involve or target the bone marrow.
The aim of this work, is to study the echo signal changes of bone marrow of some lesions such as anemias, leukemia, lymphoma and ~histocytosis ... etc. that infiltrate bone marrow which comparative study between plain x-ray and MRI in these lesions.