Amen T2* and T2 phantoms are devices that allow calibration of the MR measurements for absolute iron content. Phantoms are test tubes filled with aqueous solutions or gel compounds of materials that mimic various tissue relaxation times (T1, T2 and T2*). Phantoms are commonly used in MRI when quantification is desired. Our phantom will consist of a multitude of small vials which will be visible in the imaging plane. The relaxation times vary in the different vials of the phantom and are known very accurately, especially the T2 and T2* values, which vary over the physiological relevant range. This way the phantom can be used to calibrate the T2* values obtained from the patients heart and liver and eventually be correlated to absolute iron concentrations.