At highest field strengths, the core of the clot may have low signal on T2-weighted images, due to the presence of intracellular methemoglobin or of deoxyhemoglobin.

高场强时，血块的中心在T2加权像上低，由于细胞内的高铁血红蛋白或还原型血红蛋白存在产生的。