Or you can get a chest xray

Do you think my MRI of my chest will be sufficient ?

I had to get a TB as well before returning to work, so it was suggested to get the blood test or in my case I had just had a CT scan previously of my chest and the doctor was able to pull it up , read it and added an addendum stating no TB seen. Now won't have to have another for 5 years

Normally physicians will not expose cancer patients to more radiation from x-rays.

They can actually do a TB test with blood - called Quanterferon TB Gold - more accurate than the PPD.