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calbhollo OP t1_j2akhny wrote

Reply to comment by spudmix in ELI5: What does Prior mean when used as a noun? by calbhollo

Thanks! That helps.

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boring_pants t1_j2awl58 wrote

The term is also used in medical imaging to refer to an older study you use as a reference. Like, say, women past a certain age are offered a mammography screening every year or two, and here, the "prior" is last year's screening images. Radiologists will have the current (the primary) and several old (the priors) images on screen side by side so they can compare and spot any changes.

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