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Published online before print September 22, 2005, 10.1148/radiol.2372041734
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Intracranial Aneurysms at MR Angiography: Effect of Computer-aided Diagnosis on Radiologists' Detection Performance1

Toshinori Hirai, MD, Yukunori Korogi, MD, Hidetaka Arimura, PhD, Shigehiko Katsuragawa, PhD, Mika Kitajima, MD, Masayuki Yamura, MD, Yasuyuki Yamashita, MD and Kunio Doi, PhD

1 From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto 860-8556, Japan (T.H., S.K., M.K., M.Y., Y.Y.); Department of Radiology, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan (Y.K.); Department of Health Sciences, Kyushu University, Fukuoka, Japan (H.A.); and Department of Radiology, University of Chicago, Chicago, Ill (K.D.). Received October 9, 2004; revision requested December 20; revision received January 6, 2005; accepted January 25. Address correspondence to T.H. (e-mail: toshinor{at}beige.ocn.ne.jp).



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  		Figure 1. Graph shows average receiver operating characteristic curves for all observers in the detection of intracranial aneurysms without and with CAD output. The average Az value in the detection of aneurysms was significantly improved from 0.931 to 0.983 when observers used the computer output (P = .001).

 


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  		Figure 2. Graph shows average receiver operating characteristic curves for eight neuroradiologists in the detection of intracranial aneurysms. The average Az value in detection of aneurysms was improved significantly from 0.963 to 0.984 when they used the computer output (P = .014).

 


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  		Figure 3. Graph shows average receiver operating characteristic curves for seven general radiologists in the detection of intracranial aneurysms. The average Az value in detection of aneurysms was improved significantly from 0.894 to 0.983 when they used the computer output (P = .022).

 


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  		Figure 4. Graph shows number of cases (>20%) affected by the CAD output in confidence level with regard to patients with aneurysms. There were no cases affected detrimentally. The numbers 1–8 on x-axis represent the eight neuroradiologists and 9–15 represent the seven general radiologists.

 


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  		Figure 5. Graph shows number of cases (>20%) affected by CAD output in confidence level with regard to patients without aneurysms. The numbers 1–8 on x-axis represent the eight neuroradiologists, and 9–15 represent the seven general radiologists.

 




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