Accessing directory of SectionImage

Hello all – I am a newcomer to this dataset and am working with the Image-to-Atlas and Image-to-Image API and I wanted someone’s advice. I have a dataset of coronal scans and am looking to overlay atlas-based subregions to my scans.
I am wondering if anyone has any suggestions within the API.
Would I need to first anchor my image, find the corresponding SectionNumber, then query the API?
Am I on the right track?
Thanks all.