Time-of-Flight Magnetic Resonance Angiography of the Canine Brain at 3.0 Tesla and 7.0 Tesla. American Journal of Veterinary Research (2011)
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Time-of-flight MRA is a noninvasive imaging tech-nique that does not require injection of contrast agents. Time-of-flight MRA depends on flowing blood entering a tissue slice (2-D MRA) or tissue volume (3-D MRA) after the tissue has been rendered signal free, thus resulting in images with high-signal vessels visual-ized against a low-signal background, without the need for contrast medium.1