Passive Visualization of Needles
Today, two forms of visualization of needles or any other interventional device are possible: active visualization and passive visualization. The first is a technically ambitious procedure owing to the need for equipment, such as a second high-frequency channel, and special hard- and software for superimposing the actively visualized device on an MR image. The second method is the traditional way of performing intervention in radiology by using the direct depiction of the device itself in an X-ray beam or of the artifact it causes in sonography or computed tomography (Duckwiler et al. 1989; Fischer et al. 1994; Lufkin et al. 1987). The advantage of this concept is its straightforwardness, because no specialized hardware or software is necessary. In passive visualization of needles in MRI some difficulties can be encountered.
KeywordsSpin Echo Turbo Spin Echo Gradient Echo Main Magnetic Field Large Artifact
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