同型暗号化によるプライバシー保護のディープラーニングモデルの開発:腎臓CTイメージングにおける技術的実現可能性研究
Sang-Wook Lee1, Jongmin Choi2, Min-Je Park2
1Department of Anesthesiology and Pain Medicine, Asan Medical Centre, University of Ulsan College of Medicine, Seoul, Republic of Korea.
Radiology. Artificial intelligence
|August 27, 2025
まとめ
この研究は,CT腎臓質量分析のためのディープラーニングによるホモモルフな暗号化の使用が技術的に実現可能であることを示しています. 端末から端末への暗号化により データのプライバシーを保証しながら 診断の精度を同等にします
科学分野:
- 医療用イメージング
- 人工知能
- 暗号化
背景:
- ディープラーニングモデルは,腎臓のCT画像の分析に有効です.
- しかし,プライバシーの懸念は,これらのモデルで敏感な患者のデータの使用を制限しています.
- ホモモルフな暗号化は,プライバシー保護分析の潜在的な解決策を提供します.
研究 の 目的:
- プライバシーを守るCT腎臓質量分析のためのディープラーニングにホモモルフな暗号化を統合する技術的可行性を評価する.
- 診断性能と計算上の要求に対する暗号化の影響を評価する.
主な方法:
- 3段階のディープラーニングシステムを開発しました.参照CNN (Ref-CNN),暗号化のために修正された (Approx-CNN),CKKSスキームを使用して完全に同型暗号化 (HE-CNN).
- 腎臓の12446のCT画像でモデルを訓練し評価した.
- 受信機操作特性曲線 (AUC) 下の面積と精度リコール曲線 (AUPRC) 下の面積を用いて性能を評価した.
主要な成果:
- すべてのモデルは高い診断精度を達成した (AUC: 0. 89- 0. 99,AUPRC: 0. 67- 0. 99).
- Ref-CNNとApprox-CNNの間で観測された最小のパフォーマンストレードオフ.
- ホモモルフな暗号化により,ストレージ (65KBから32MB) と計算時間が大幅に増加した (CPU 50分 vs. GPU 90秒).
結論:
- 同型暗号を用いたプライバシー保護の深層学習推論は,CT画像での腎臓質量分類に技術的に実現可能である.
- エンドツーエンドのデータ暗号化により,同様の診断性能が得られます.
- コンピューティングとストレージの要件が大幅に増加したため,最適化されたハードウェアの加速が必要になります.
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