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| Paper Abstract and Keywords | ||
| Presentation | 2026-03-06 13:38 Depthmap-based 2D-3D Reconstruction of the Wrist Bones from a Single-View Radiograph for the Diagnosis of Deformity and Treatment Planning Yanis Tahrat, Yi Gu (NAIST), Ryoya Shiode, Kunihiro Oka (Osaka Univ.), Soufi Mazen, Yoshinobu Sato, Yoshito Otake (NAIST)  MI2025-104 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Single-view radiography is the standard for hand deformity assessment but lacks the three-dimensional spatial information essential for precise surgical planning. While depthmap-based 2D–3D reconstruction offers a potential solution, its application to the wrist region is challenged by complex bone geometry and significant anatomical overlap. This study proposes a framework for 2D–3D reconstruction of the radius, ulna, and carpal bones from a single radiograph. The core of the method is a dedicated CT-to-X-ray registration pipeline designed to extract quantitative depth information. The framework integrates 2D deep learning for bone segmentation and landmark detection to constrain the search space. Registration is formulated as a gradient-driven optimization problem, employing a gradient correlation similarity metric and the Covariance Matrix Adaptation Evolution Strategy (CMA-ES) to achieve robust pose estimation. The proposed framework was validated on a large dataset consisting of 510 CT volumes and 476 radiographs. Registration quality was assessed through visual evaluation of DRR–radiograph overlays, demonstrating stable and reproducible alignment across cases and Target Registration Error value. This optimized registration enabled the generation of high-fidelity, millimeter-scale quantitative depth maps, which can be used as the basis for training tasks, including 2D–3D bone reconstruction models. By integrating single-view radiography with quantitative depth estimation, this work bridges the gap toward clinically actionable 3D data and enhances conventional radiographic assessment with a geometry-aware tool for orthopedic deformity diagnosis and treatment planning. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | CT-to-X-ray registration / single-view radiography / depth map / wrist / radius and ulna / CMA-ES / U-Net / | |
| Reference Info. | IEICE Tech. Rep., vol. 125, no. 395, MI2025-104, pp. 167-170, March 2026. | |
| Paper # | MI2025-104 | |
| Date of Issue | 2026-02-26 (MI) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | MI2025-104 |
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| Conference Information | |
| Committee | MI |
| Conference Date | 2026-03-05 - 2026-03-06 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | OKINAWAKEN SEINENKAIKAN |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Medical Imaging, etc. |
| Paper Information | |
| Registration To | MI |
| Conference Code | 2026-03-MI |
| Language | English |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Depthmap-based 2D-3D Reconstruction of the Wrist Bones from a Single-View Radiograph for the Diagnosis of Deformity and Treatment Planning |
| Sub Title (in English) | |
| Keyword(1) | CT-to-X-ray registration |
| Keyword(2) | single-view radiography |
| Keyword(3) | depth map |
| Keyword(4) | wrist |
| Keyword(5) | radius and ulna |
| Keyword(6) | CMA-ES |
| Keyword(7) | U-Net |
| Keyword(8) | |
| 1st Author's Name | Yanis Tahrat |
| 1st Author's Affiliation | Nara Institute of Science and Technology (NAIST) |
| 2nd Author's Name | Yi Gu |
| 2nd Author's Affiliation | Nara Institute of Science and Technology (NAIST) |
| 3rd Author's Name | Ryoya Shiode |
| 3rd Author's Affiliation | Osaka University (Osaka Univ.) |
| 4th Author's Name | Kunihiro Oka |
| 4th Author's Affiliation | Osaka University (Osaka Univ.) |
| 5th Author's Name | Soufi Mazen |
| 5th Author's Affiliation | Nara Institute of Science and Technology (NAIST) |
| 6th Author's Name | Yoshinobu Sato |
| 6th Author's Affiliation | Nara Institute of Science and Technology (NAIST) |
| 7th Author's Name | Yoshito Otake |
| 7th Author's Affiliation | Nara Institute of Science and Technology (NAIST) |
| Speaker | Author-1 |
| Date Time | 2026-03-06 13:38:00 |
| Presentation Time | 13 minutes |
| Registration for | MI |
| Paper # | MI2025-104 |
| Volume (vol) | vol.125 |
| Number (no) | no.395 |
| Page | pp.167-170 |
| #Pages | 4 |
| Date of Issue | 2026-02-26 (MI) |
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