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Visibility of calcium on MR and CT: can MR show calcium that CT cannot?
1Department of Radiology, University of Toronto, Ontario, Canada.
AJNR. American Journal of Neuroradiology
|June 1, 1994
Abstract
Purpose:
To test the hypothesis that calcium can be visible on MR images without being visible on CT.
Methods:
Five different calcium salts ranging in concentration from 0 to 0.45 g/mL were suspended in 2% agarose gel and studied using T2-weighted MR, T1-weighted MR, and CT. MR signal intensity, CT attenuation, and image noise were measured. Relative visibility was determined from these measurements.
Results:
CT was shown to be more than 10 times as sensitive as T2-weighted MR or T1-weighted MR for the detection of calcium.
Conclusion:
MR cannot show calcium that is occult on CT.