Arteriovenous malformations (AVMs) are characterised by arteriovenous shunting, which increases oxygenation in the veins draining the AVM compared to healthy veins. In healthy veins, a quadratic relationship is expected between the transverse relaxation rate ($$$R_2^*$$$) and the magnetic susceptibility ($$$\chi$$$). By calculating $$$\chi$$$ and $$$R_2^*$$$ we investigated whether this relationship holds in the AVM draining veins and superior sagittal sinuses of fourteen patients. We found a significant positive correlation between $$$R_2^*$$$ and $$$\chi^2$$$ in the healthy veins, but not in the AVM draining veins where the quadratic relationship is disrupted and $$$\chi$$$ values can be used to measure oxygenation.
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