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Central nervous system imaging. When is CT more appropriate than MRI?
1University of Toronto, Ontario, Canada.
Postgraduate Medicine
|November 21, 1998
Summary
Computed tomography (CT) and magnetic resonance imaging (MRI) offer advanced noninvasive visualization of the brain and spinal cord. Future applications will focus on functional and physiologic imaging for enhanced clinical utility.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Noninvasive imaging techniques have significantly advanced the display of central nervous system (CNS) anatomy over 25 years.
- Computed tomography (CT) and magnetic resonance imaging (MRI) are key diagnostic tools for CNS disorders.
Purpose of the Study:
- To review the capabilities and limitations of CT and MRI for CNS imaging.
- To discuss future directions in CNS imaging, focusing on functional and physiologic applications.
Main Methods:
- Review of established CT and MRI techniques for brain and spinal cord imaging.
- Discussion of the advantages and disadvantages of each modality.
Main Results:
- CT excels in speed, availability, calcification/hemorrhage detection, and bony detail.
- MRI provides superior soft-tissue contrast, vascular visualization, and multiplanar imaging.
- Cost and radiation exposure are important considerations for CT and MRI selection.
Conclusions:
- CT and MRI are indispensable for CNS anatomic imaging.
- Future advancements in functional and physiologic imaging will further enhance the clinical value of CT and MRI for CNS disorders.