Introduction:

On the Patient Characteristics page there are 17 questions regarding your patient or lesion.

Please select the single best answer. It is often useful to run ORAD with different settings
to evaluate various options. If you select “unknown” or “unselected” in any category then this feature
is not considered in formulating a differential. If you are unsure of the question being asked you may
select the hot word in the question for a visual description of your choices.

The relative prevalence of each condition is considered in formulating a differential.
You may select to inactivate this feature by selecting “No” for “prevalence.”

To generate a differential diagnosis after you have selected the most appropriate description
for each lesion characteristic touch the button at the bottom labeled “Differential”.

If you wish to consider only one or a few features you may touch the button labeled “Deselect”
to set all Patient Characteristics to “unselected” and then change the features of interest.

The Differential Diagnosis page displays the differential diagnosis for the lesion you described.
If you recognize that one or more lesion suggested by ORAD is clearly not appropriate, then you may
remove it from the Differential Diagnosis list by checking the box to the left of the lesion and
touching the button labeled “Remove Lesion(s).” ORAD will then recalculate the differential
without these lesions. This process may be repeated as often as desired. You may also wish to deselect
a common, and appropriate, lesion to see less prevalent lesions matching the patient criteria.
After one or more lesions have been removed they may be restored by touching the button labeled “Restore.”
Lesions with information are shown with a small image icon ().

You may also gain access to references for lesions by touching the lesion name.
You may search for a lesion by selecting the “Lesions” button.

The lesion data base information is analyzed using Bayes' theorem as described in
White, S: Computer-aided differential diagnosis of oral radiographic lesions. J Dentomaxillofac. Radiol.18(2)53-59, 1989.

Touch here or on the image above to start ORAD.


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Last modified December 23, 2017.
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