AN EXPERT SYSTEM SOFTWAREMYSIN

•In 1965 DENDRAL

was used in expert

system •MYCIN was developed

in 1976

WHY MYCIN Disease diagnosis and therapy selection

Advise for non expert physicians with time

consideration and incomplete evidence as Bacterial infections of the blood

Extended to other elements

PROBLEM BEFORE MYCIN• ROBERTS AND VISCONTI:- Only 13% patients are treated rationally 66% are being given irrational treatment 21% are being given questionable treatment

• IRRATIONAL MEANS, FOR

EXAMPLE:- Using a contra-indicated combinationUsing the wrong agent for a specific organisms Not taking the required culture

DEVELOPMENT OF MYCIN • Developed by ADWARD SHORTLIFFE in

1976

a STANFORD UNIVERSITY in the artificial

intelligence in medicine group

• First system that was implemented into the

medical field

HOW MYCIN WAS TESTED FOR ACCURACY • 10 patients for a particular disease were chosen

• Their information was sent to 8 physicians and

MYCIN

• All then came up with recommended treatment

• Those recommendations along with what the

patient actually received as treatment was sent

to 8 unidentified specialists

WHO WON FROM THE TEST • MYCIN won the test

• MYCIN received the highest score as for

as accuracy and effectiveness of diagnosis

STAGES IN DAIGNOSIS AND TREATMENT • Decide if there is significant infection

• Identify the causing organism(s) by clinical

and laboratory evidence

• Decide what antibiotic agent the organisms

are sensitive to

• Prescribe the optimal drug combination for

particular case

RESULTS Never implemented for routine clinical use Shown to be competent by panels of experts

even in case where experts themselves disagreed on conclusions

Key contributions Reuse of production rules( expansion knowledge

aquision )

PROBLEMS • If the system gives an incorrect diagnosis,

who is to be blamed or sued

• Physicians rely to heavily on system

instead of consulting other experts

Resources Wikipedia Page

Available at: http://en.wikipedia.org/wiki/Expert_system Building Expert Systems in Prolog

Available at: http://www.amzi.com/ExpertSystemsInProlog/xsipfrtop.htm

Artificial Intelligence - A modern Approach by Stuart Rassell, Peter Norvig

PC AI – Expert Systems Available at:

http://www.pcai.com/web/ai_info/expert_systems.html VisiRule Web Demos (A simple example):

http://www.lpa.co.uk/vrs_dem.htm