Multi-needle Localization for Pelvic Seed Implant Brachytherapy based on Tip-handle Detection and Matching
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913146928627712 |
|---|---|
| author | Xiao, Zhuo Zhou, Fugen Wang, Jingjing He, Chongyu Liu, Bo Sun, Haitao Ji, Zhe Jiang, Yuliang Wang, Junjie Wu, Qiuwen |
| author_facet | Xiao, Zhuo Zhou, Fugen Wang, Jingjing He, Chongyu Liu, Bo Sun, Haitao Ji, Zhe Jiang, Yuliang Wang, Junjie Wu, Qiuwen |
| contents | Accurate multi-needle localization in intraoperative CT images is crucial for optimizing seed placement in pelvic seed implant brachytherapy. However, this task is challenging due to poor image contrast and needle adhesion. This paper presents a novel approach that reframes needle localization as a tip-handle detection and matching problem to overcome these difficulties. An anchor-free network, based on HRNet, is proposed to extract multi-scale features and accurately detect needle tips and handles by predicting their centers and orientations using decoupled branches for heatmap regression and polar angle prediction. To associate detected tips and handles into individual needles, a greedy matching and merging (GMM) method designed to solve the unbalanced assignment problem with constraints (UAP-C) is presented. The GMM method iteratively selects the most probable tip-handle pairs and merges them based on a distance metric to reconstruct 3D needle paths. Evaluated on a dataset of 100 patients, the proposed method demonstrates superior performance, achieving higher precision and F1 score compared to a segmentation-based method utilizing the nnUNet model,thereby offering a more robust and accurate solution for needle localization in complex clinical scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17931 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-needle Localization for Pelvic Seed Implant Brachytherapy based on Tip-handle Detection and Matching Xiao, Zhuo Zhou, Fugen Wang, Jingjing He, Chongyu Liu, Bo Sun, Haitao Ji, Zhe Jiang, Yuliang Wang, Junjie Wu, Qiuwen Computer Vision and Pattern Recognition Medical Physics Accurate multi-needle localization in intraoperative CT images is crucial for optimizing seed placement in pelvic seed implant brachytherapy. However, this task is challenging due to poor image contrast and needle adhesion. This paper presents a novel approach that reframes needle localization as a tip-handle detection and matching problem to overcome these difficulties. An anchor-free network, based on HRNet, is proposed to extract multi-scale features and accurately detect needle tips and handles by predicting their centers and orientations using decoupled branches for heatmap regression and polar angle prediction. To associate detected tips and handles into individual needles, a greedy matching and merging (GMM) method designed to solve the unbalanced assignment problem with constraints (UAP-C) is presented. The GMM method iteratively selects the most probable tip-handle pairs and merges them based on a distance metric to reconstruct 3D needle paths. Evaluated on a dataset of 100 patients, the proposed method demonstrates superior performance, achieving higher precision and F1 score compared to a segmentation-based method utilizing the nnUNet model,thereby offering a more robust and accurate solution for needle localization in complex clinical scenarios. |
| title | Multi-needle Localization for Pelvic Seed Implant Brachytherapy based on Tip-handle Detection and Matching |
| topic | Computer Vision and Pattern Recognition Medical Physics |
| url | https://arxiv.org/abs/2509.17931 |