Yes DE is correct : chest abdomen pelvis is what I've had and they consider required for rectal primaries.
The reason I was adamant is that my lung met was initially missed on a CT after resection BUTT picked up later on a survey xray, as I had opted for CT / abdominal ultrasound + thoracic xrays, offset every 6 months to keep lots of "eyes" on my imaging results.
And yes, sometimes the Canadian system can be a little UNwieldy and protocol heavy
BUTT the good news is there are more eyes looking, as in
" you miss more for NOT looking, than not knowing ! "
Hoping all your results are good !!