Forgive me if i'm wtrong but I am merely a dabbler in this field, general interest in medicine that I could never satisfy due to not being good enough to fix people, just to fix aircraft. By my understanding an mri? Image works from the minor metallic elements in the blood (chiefly iron) so how does this work on patients with depleted blood iron content i.E anaemia? Just a point of intellectual curiosity, I would be grateful for any response, especially if I have any misconceptions that can be corrected.