Table 5. Definition of Appropriateness.

Grading	Definition	Level of Evidence
Usually appropriate	The imaging procedure is indicated in the specified clinical scenarios when benefits generally outweigh risks; an effective option for individual care plans, although not always necessary depending on physician judgment and patient-specific preferences	High or moderate
May be appropriate	The imaging procedure may be indicated in the specified clinical scenarios as an alternative to imaging procedures with a more favorable risk–benefit ratio, or the risk–benefit ratio for patients is equivocal; effectiveness for individual care must be determined by a patient's physician in consultation with the patient on the basis of additional clinical variables and judgment along with patient preferences	High or moderate
May be appropriate, disagreement	The individual suggestions are dispersed	Low
Usually not appropriate	The imaging procedure is unlikely to be indicated in the specified clinical scenario with lack of clear benefit/risk advantage; rarely an effective option for individual care plans; exceptions should have documentation of the clinical reasons for proceeding with this care option	High or moderate