A novel forward-looking intravascular orthogonal-solenoid coil design overcomes signal nulls of traditional side-viewing catheters, potentially improving navigation through occlusive arterial lesions.
May enable forward-looking intravascular MR imaging; hypothesis-generating in animals, requiring human validation before clinical consideration.
Recent intravascular imaging coil configurations have focused on side-viewing catheters capable of imaging the vessel wall of a patent vessel. These designs suffer from the presence of signal nulls and the inability to image in front of a device when it is oriented along the main static field. This is of particular importance when a device is being navigated through an occlusive lesion. To address these limitations we propose a new intravascular coil design consisting of two independent orthogonal solenoids located at the catheter tip. The two coils are oriented in such a way that signal nulls are eliminated and imaging is possible in planes located directly in front of the catheter. Complete characterization of the spatial signal-to-noise ratio (SNR) distribution of the design is presented. The coil configuration was fabricated on a 6F guide catheter, and its use is demonstrated in phantoms and in vivo.
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Anderson et al. (2008) studied this question.
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