To avoid false-positive, results, the best time to perform a PET/CT study is 8-12 weeks after completion of chemotherapy and radiotherapy.
Postoperative inflammatory changes are seen till about 12 weeks or, at times, longer.
How long after last chemo should CT scan be done?
Immediate (within 10 days of the last chemotherapy administration), early (from 11 to 20 days) and delayed (from 21 to 30 days) contrast-enhanced CT.
How often should a cancer patient have a PET scan?
In a patient who is in good physical shape, I do this every three months with the advice to come in sooner if you have any worries. In practice, many doctors do CT scans of the body and pelvis every few months; others do nuclear medicine tests such as PET scans or bone scans.
Can you have a PET scan while on chemo?
Positron emission tomography (PET) scans during induction chemotherapy for esophageal cancer helps assess patient response to treatment and adjust their therapy, which could lead to an improved complete response rate prior to surgery, says a new study.
How do you know if chemo is working?
How Can We Tell if Chemotherapy is Working?
- A lump or tumor involving some lymph nodes can be felt and measured externally by physical examination.
- Some internal cancer tumors will show up on an x-ray or CT scan and can be measured with a ruler.
- Blood tests, including those that measure organ function can be performed.