F/U CT Scan: Chest or Chest/Abdomen?

Hi, Everyone,
I need some help on this, please. My husband (Stage IV: supraclavicular node involvement) started his 7th round of chemo (Oxaliplatin and Xeloda) on Tuesday. As we were leaving, they gave us his new calendar and instructions for a PET and CT on 12/27. I was just reading the instructions tonight and see there will be a PET/CT as well as a more detailed CT (as the oncologist explained on Monday.) But, the more detailed CT just says Chest. I'm wondering why it is not Chest/Abdominal since the tumor is/was just above the GE junction and I see here that the liver frequently gets involved. I'm going to call the office on Monday, but would love to get some input from you experienced folks oh what you think and any other questions I should ask before the tests. These are SO important because the next/continuing plan will be based on them.
Thanks!
Angie