Image-guided Procedures: A Comparison of Three Tomographic Technologies

Abstract

Our report describes techniques of computed tomography (CT), electron-beam computed tomography (EBCT), and magnetic resonance imaging (MRI) for tomographic-guided diagnosis and therapy. The advantages and drawbacks of conventional CT guidance, real-time CT-guided interventions, electron-beam CT-guided interventions, and MRI-guidance are summarized.

Conventional CT guidance provides high-resolution imaging with good differentiation of tissues and precise imaging. X-ray exposure and the restriction to a single-imaging plane are major drawbacks. The development of CT fluoroscopy leads to significantly increased accuracy of tip tracking and reduced radiation dose and time consumption, as compared with conventional CT guidance.

EBCT was especially designed for cardiac imaging. Short scanning times, high spatial resolution, and the recent development of real-time EBCT could lead to a new field of interventional application.

Open MRI configurations with specific sequences for percutaneous procedures, on-line MRI control, and the development of MR compatible instruments make MRI guidance the most interesting and innovative method today. One of the most important advantages of MRI is in monitoring of tissue changes during therapy.

Keywords:

Interventional procedures - computed tomography - electron-beam computed tomography - magnetic resonance imaging