TY - JOUR
T1 - Intracranial aneurysms at MR angiography
T2 - Effect of computer-aided diagnosis on radiologists' detection performance
AU - Hirai, Toshinori
AU - Korogi, Yukunori
AU - Arimura, Hidetaka
AU - Katsuragawa, Shigehiko
AU - Kitajima, Mika
AU - Yamura, Masayuki
AU - Yamashita, Yasuyuki
AU - Doi, Kunio
PY - 2005/11/1
Y1 - 2005/11/1
N2 - PURPOSE: To retrospectively evaluate the effect of computer-aided detection (CAD) on radiologists' performance in detection of intracranial aneurysms with magnetic resonance (MR) angiography. MATERIALS AND METHODS: The institutional review board approved this study and did not require patient informed consent. Fifty maximum intensity projection MR angiograms in 50 patients were used for observer performance study. The group included 22 patients (age range, 43-86 years; mean, 60.2 years; 6 men and 16 women) with intracranial aneurysms and 28 patients (age range, 32-80 years; mean, 58.8 years; 10 men and 18 women) without aneurysms. The MR angiograms were obtained with three-dimensional time-of-flight 1.5-T MR imaging. Fifteen radiologists, including eight neuroradiologists and seven general radiologists, participated in the observer performance test. They interpreted the angiograms first without and then with the aid of the computer output by using an automated computerized scheme. The observers' performance without and with the computer output was evaluated with receiver operating characteristic analysis. RESULTS: For all 15 observers, average area under the receiver operating characteristic curve (Az) value for detection of aneurysms was increased significantly from 0.931 to 0.983 (P = .001) when they used the computer output. Az values for general radiologists and neuroradiologists increased from 0.894 to 0.983 (P = .022) and from 0.963 to 0.984 (P = .014), respectively. Improvement in the performance of general radiologists in terms of the Az value was much greater than that of neuroradiologists. Performance of general radiologists with CAD (A z = 0.983) slightly exceeded that of neuroradiologists without CAD (Az = 0.963) (P = .048). CONCLUSION: CAD improved neuroradiologists' and general radiologists' performance for detection of intracranial aneurysms with MR angiography; improvement was greater for general radiologists than it was for neuroradiologists.
AB - PURPOSE: To retrospectively evaluate the effect of computer-aided detection (CAD) on radiologists' performance in detection of intracranial aneurysms with magnetic resonance (MR) angiography. MATERIALS AND METHODS: The institutional review board approved this study and did not require patient informed consent. Fifty maximum intensity projection MR angiograms in 50 patients were used for observer performance study. The group included 22 patients (age range, 43-86 years; mean, 60.2 years; 6 men and 16 women) with intracranial aneurysms and 28 patients (age range, 32-80 years; mean, 58.8 years; 10 men and 18 women) without aneurysms. The MR angiograms were obtained with three-dimensional time-of-flight 1.5-T MR imaging. Fifteen radiologists, including eight neuroradiologists and seven general radiologists, participated in the observer performance test. They interpreted the angiograms first without and then with the aid of the computer output by using an automated computerized scheme. The observers' performance without and with the computer output was evaluated with receiver operating characteristic analysis. RESULTS: For all 15 observers, average area under the receiver operating characteristic curve (Az) value for detection of aneurysms was increased significantly from 0.931 to 0.983 (P = .001) when they used the computer output. Az values for general radiologists and neuroradiologists increased from 0.894 to 0.983 (P = .022) and from 0.963 to 0.984 (P = .014), respectively. Improvement in the performance of general radiologists in terms of the Az value was much greater than that of neuroradiologists. Performance of general radiologists with CAD (A z = 0.983) slightly exceeded that of neuroradiologists without CAD (Az = 0.963) (P = .048). CONCLUSION: CAD improved neuroradiologists' and general radiologists' performance for detection of intracranial aneurysms with MR angiography; improvement was greater for general radiologists than it was for neuroradiologists.
UR - http://www.scopus.com/inward/record.url?scp=27144459401&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=27144459401&partnerID=8YFLogxK
U2 - 10.1148/radiol.2372041734
DO - 10.1148/radiol.2372041734
M3 - Article
C2 - 16179404
AN - SCOPUS:27144459401
SN - 0033-8419
VL - 237
SP - 605
EP - 610
JO - Radiology
JF - Radiology
IS - 2
ER -