Evaluation of MRI included decrease in signal intensity of discs, posterior disc protrusion, disc space narrowing, and foraminal stenosis using 2 to 4 numerical grades.

MRI使用2 - 4数字评分评估包括椎间盘信号强度降低，椎间盘向后突出，椎间隙狭窄，以及椎间孔狭窄。

youdao

In addition to a new numerical scale, at least one company is assigning letter grades to those scores.

NPR: Credit-Reporting Agencies Create New Scoring Format