On-screen alarms in computer-aided detection systems: combining signal detection, human factors, and system design

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Authors
  1. Kessel, R.T.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
It is usual for computer-aided detection (CAD) systems to report automated alarms by highlighting their position on the operator's primary viewing screen. Here we carry out a "cost-benefit" analysis of the practice, contrasting its operational utility and liabilities. Because on-screen alarms are so very central to CAD systems, a cost-benefit analysis provides a framework for a critique of CAD systems generally, combining aspects of signal detection theory, human factors, and system design. The analysis highlights the shortcomings of existing CAD systems, and identifies the source of widespread dissatisfaction with them; why they are seen more often as a burden than a help by operators. The primary cause, it is argued, is that CAD systems are designed without a clear specification of the assisting role that automatic target recognition (ATR) is to fulfil for the operator. Clarified purpose in turn requires well-defined fusion rules by which the automated alarms are combined with the operator's and by which the assisting goals are ultimately achieved. Given clarified purpose and fusion rules, it can be shown that the optimal integration of the ATR as an operator aid is likely to require radically different algorithm settings than if---as ATR developers generally assume for their algorithms---ATR were to operate autonomously. TRUNCATED

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Keywords
Computer aided classification;Computer aided detection
Report Number
DREA-TM-2001-184 — Technical Memorandum
Date of publication
01 Nov 2001
Number of Pages
40
DSTKIM No
CA020549
CANDIS No
517270
Format(s):
Hardcopy;Document Image stored on Optical Disk

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