Tumor Segmentation with T1 and T1 with contrast agent

Dear all,

I am trying to segment a tumor in a brain. I only have the T1 and the T1 with contrast agent image. And I want to segment from the rest of the brain this part of the tumor which is visible by the contrast agent. Are there any tools available?
I only found automatic (BRATS etc.) tool which need T1, T2 and the FLAIR Sequence.

Best