[Submitted on 11 Aug 2026]
Title:Personalized and Explainable Blood Pressure Estimation from PPG via Hybrid CNN--Morphological Features
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Abstract:Continuous cuffless blood pressure (BP) monitoring using photoplethysmography (PPG) offers a promising solution for personalized healthcare. However, existing methods have two major limitations. Handcrafted feature-based approaches rely on precise fiducial point detection and are limited to short-term analysis, while deep learning models, despite their accuracy, often operate as black boxes with limited physiological interpretability. To address these challenges, we propose a physiology-guided hybrid framework for personalized BP estimation that couples a convolutional neural network (CNN) branch capturing global and local waveform dynamics with a morphology-prior branch that explicitly encodes person-specific vascular characteristics. By embedding a morphology-based feature set that explicitly encodes individual vascular characteristics, the proposed framework enhances personalization and reduces dependence on large-scale training datasets. Evaluated on a subset of the MIMIC-III database under a subject-specific (personalized) testing protocol, the proposed personalized physiology-guided hybrid approach achieved mean absolute errors (MAEs) of 3.77 mmHg for systolic BP and 2.36 mmHg for diastolic BP, corresponding to relative improvements of 43.7% and 32.4% over a subject-specific (personalized) CNN-only baseline. SHAP-based analysis confirmed that the introduced morphology-prior features align with individual vascular characteristics, reinforcing per-subject interpretability. These findings highlight the potential of personalized, physiology-guided hybrid learning with novel morphological descriptors for accurate and explainable BP monitoring in real-world settings.
Subjects:
Computer Vision and Pattern Recognition (cs.CV)
Cite as: arXiv:2609.13190 [cs.CV]
(or arXiv:2609.13190v1 [cs.CV] for this version)
https://doi.org/10.48550/arXiv.2609.13190
arXiv-issued DOI via DataCite
Related DOI:
https://doi.org/10.1109/ACCESS.2026.3658724
DOI(s) linking to related resources
Submission history
From: Myung-Kyu Yi [view email] [v1] Tue, 11 Aug 2026 09:26:24 UTC (951 KB)
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