What ct scan protocol is recommended for follow-up scans on pts w/ h/o crc & multiple <1cm cystic liver lesions on right lobe to r/o liver metastasis?

Depends: If you already had multiple ct scans in the past all showing these small sub-centimeter liver lesions and these were stable (have not increased in size) then follow up ct for crc (colorectal ca) can be done just in portal venous phase (routine contrast enhanced ct). If your oncologist or the radiologist are concerned about these lesions and want to r/o liver mets the best study is mri.

Liver protocol: Ct scan with liver protocol or MRI of the liver would be able to show you in more detail. If there were no liver lesions before and now with multiple liver lesions, ultimately, a liver biopsy should be done to definitely tell you what they are. Your cancer marker also can give you more information. Pet scan should be considered as well.