As with all CE-MRA techniques, an intravenous line (22 g. or better) should be placed in the arm before the patient enters the magnet. The shoes should be removed, and care should be taken to ensure any metallic objects such as clips holding stretchable bandage material have been removed from the foot. When the foot is placed in the coil, a combination of padding and/or straps should be used to immobilize the foot as much as practical. Multi-element phased array coils, if used, can have decreased signal to noise secondary to cross talk if the coil elements are too close to one another, and some padding to ensure the coils remain symmetrically spaced from each other can be helpful. The foot should be in a relatively neutral position, as even moderate plantar flexion is known to cause an artifactual stenosis of the proximal dorsalis pedis artery due to compression by the inferior extensor retinaculum . Care should be taken to ensure the patient is as comfortable as possible (pillows, bolster under knees, etc.) to minimize restlessness and subsequent motion.
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