We are in the midst of major advances in medical imaging,
converting static pre sentation of anatomic information into near
real-time interactive imaging and displays capable of depicting
both structure and function. This will have pro found impact on
diagnosis and image-guided therapies. These advances have been most
notable in the modalities of computed tomog raphy and magnetic
resonance. These technologies have become capable of ac quiring
volumetric images in short periods of time. Speed gains in MRI were
very significant in the early 1990s with the development of
clinically usable pulse se quences for gradient-recalled and
echo-planar imaging. It appears that further speed gains in MRI
will be difficult to achieve. The development of spiral CT has
ushered in an era in which major speed gains in CT are also
possible. This has enabled creation of new types of applica tions
such as CT angiography, which has already come to replace catheter
angio graphy at many medical centers throughout the world. We are
very pleased that the results from industrial and academic
laboratories have been transferred to the bedside to improve
patient care at a speed that may be faster than in any other area
of medicine. Concurrent with advances in CT technology there have
been dramatic strides in the performance characteristics and costs
of computer hardware and software.
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