Volume 47, Issue 4 pp. 948-953
Original Research

Deep neural network-based computer-assisted detection of cerebral aneurysms in MR angiography

Takahiro Nakao MD

Corresponding Author

Takahiro Nakao MD

Radiology and Biomedical Engineering, Graduate School of Medicine, University of Tokyo, Tokyo, Japan

Address reprint requests to: T.N., Department of Radiology, University of Tokyo Hospital, Tokyo, Japan. E-mail: [email protected]Search for more papers by this author
Shouhei Hanaoka MD, PhD

Shouhei Hanaoka MD, PhD

Department of Radiology, University of Tokyo Hospital, Tokyo, Japan

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Yukihiro Nomura PhD, RT

Yukihiro Nomura PhD, RT

Department of Computational Diagnostic Radiology and Preventive Medicine, University of Tokyo Hospital, Tokyo, Japan

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Issei Sato PhD

Issei Sato PhD

Department of Radiology, University of Tokyo Hospital, Tokyo, Japan

Graduate School of Frontier Sciences, University of Tokyo, Tokyo, Japan

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Mitsutaka Nemoto PhD

Mitsutaka Nemoto PhD

Department of Computational Diagnostic Radiology and Preventive Medicine, University of Tokyo Hospital, Tokyo, Japan

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Soichiro Miki MD, PhD

Soichiro Miki MD, PhD

Department of Computational Diagnostic Radiology and Preventive Medicine, University of Tokyo Hospital, Tokyo, Japan

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Eriko Maeda MD, PhD

Eriko Maeda MD, PhD

Department of Computational Diagnostic Radiology and Preventive Medicine, University of Tokyo Hospital, Tokyo, Japan

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Takeharu Yoshikawa MD, PhD

Takeharu Yoshikawa MD, PhD

Department of Computational Diagnostic Radiology and Preventive Medicine, University of Tokyo Hospital, Tokyo, Japan

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Naoto Hayashi MD, PhD

Naoto Hayashi MD, PhD

Department of Computational Diagnostic Radiology and Preventive Medicine, University of Tokyo Hospital, Tokyo, Japan

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Osamu Abe MD, PhD

Osamu Abe MD, PhD

Radiology and Biomedical Engineering, Graduate School of Medicine, University of Tokyo, Tokyo, Japan

Department of Radiology, University of Tokyo Hospital, Tokyo, Japan

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First published: 24 August 2017
Citations: 159

Abstract

Background

The usefulness of computer-assisted detection (CAD) for detecting cerebral aneurysms has been reported; therefore, the improved performance of CAD will help to detect cerebral aneurysms.

Purpose

To develop a CAD system for intracranial aneurysms on unenhanced magnetic resonance angiography (MRA) images based on a deep convolutional neural network (CNN) and a maximum intensity projection (MIP) algorithm, and to demonstrate the usefulness of the system by training and evaluating it using a large dataset.

Study Type

Retrospective study.

Subjects

There were 450 cases with intracranial aneurysms. The diagnoses of brain aneurysms were made on the basis of MRA, which was performed as part of a brain screening program.

Field Strength/Sequence

Noncontrast-enhanced 3D time-of-flight (TOF) MRA on 3T MR scanners.

Assessment

In our CAD, we used a CNN classifier that predicts whether each voxel is inside or outside aneurysms by inputting MIP images generated from a volume of interest (VOI) around the voxel. The CNN was trained in advance using manually inputted labels. We evaluated our method using 450 cases with intracranial aneurysms, 300 of which were used for training, 50 for parameter tuning, and 100 for the final evaluation.

Statistical Tests

Free-response receiver operating characteristic (FROC) analysis.

Results

Our CAD system detected 94.2% (98/104) of aneurysms with 2.9 false positives per case (FPs/case). At a sensitivity of 70%, the number of FPs/case was 0.26.

Data Conclusion

We showed that the combination of a CNN and an MIP algorithm is useful for the detection of intracranial aneurysms.

Level of Evidence: 4

Technical Efficacy: Stage 1

J. Magn. Reson. Imaging 2018;47:948–953.

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