Signal to noise measurements of the aortic lumen on a clinical MR system and on a dedicated high-frequency ultrasound system.

<p>This figure shows that magnetic resonance angiography (MRA, black bar) demonstrated a significantly (p < 0.001) higher signal to noise ratio (SNR) compared to ultrasound (US, grey bar). MRI and ultrasound measurements were performed at comparable locations of the aorta. The time-of-flight technique in MR and the B-mode in ultrasound are techniques which are also frequently used in a clinical setting.