How to Order and Interpret Radiology Studies
How to Order and Interpret Radiology Studies
How to Order and Interpret Radiology Studies
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Bone Scan (Scintigraphy(<br />
Scintigraphy)<br />
Limitations<br />
– Lacks significant detail<br />
– Poor spatial resolution<br />
– Poor specificity<br />
– Displays activity of osteoblasts<br />
Old fractures (eg(<br />
eg. . pars defects) may not show up<br />
Certain tumors with little osteoblastic activity (eg(<br />
eg.<br />
multiple myeloma <strong>and</strong> lytic mets) ) not reliably seen<br />
Contraindications<br />
– Exposes patient <strong>to</strong> ionizing radiation<br />
– Children & pregnant women should be carefully<br />
shielded<br />
Magnetic Resonance<br />
Imaging (MRI)<br />
Majority of clinical MRI utilizes the magnetic<br />
moment of hydrogen nuclei (pro<strong>to</strong>ns)<br />
Magnetic Resonance Imaging<br />
Magnetic field pro<strong>to</strong>ns excited alignment<br />
Pro<strong>to</strong>ns snap back in<strong>to</strong> original alignment <br />
detectable rotating magnetic field<br />
Pro<strong>to</strong>ns in different tissues realign at different<br />
speeds detected as differing signal intensities<br />
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