Sub-Voxel Displacement and Ipsilateral Territory Decoupling for 3D Bilateral Coronary Artery Tree Reconstruction in Cardiac CT Angiography
Year: 2026
Type: preprint
Abstract: Bilateral coronary tree (LCA/RCA) reconstruction in cardiac CT angiography (CCTA) faces $64^3$ discretization, territory ambiguity, and ostium drift. Within GT-foreground $128^3$ ROIs ($\pm 15$-voxel margin, 9.8--12.0 mm; seed-free in ROI; whole-volume localization upstream), we propose a canonical $(Z_{IS},Y_{PA},X_{LR})$ multi-task network and scalar-potential arborescence solver. Volumes, centerlines, and thick-stem ostia map to $(Z_{IS},Y_{PA},X_{LR})$, extending a 3D pyramid encoder and tubular decoder with a $128^3\to 64^3$ skip, stop-gradient $128^3$ residual branch, 3D sub-voxel displacement head $Δ\hat{u}(x)$, ipsilateral head $(P_{LCA},P_{RCA})$, and $32^3$ ostium head. From a recall-balanced anchor, 327,385 active parameters (398,843 total) are fine-tuned in a 30-epoch AdamW loop ($ε=10^{-8}$, 7 groups) with L2-SP/anchor blending. Our solver couples Valsalva-STJ calibration, $128^3$ rooting, contralateral inhibition, radius-ratio pruning, normal-plane pullback, and collision reduction. On OOS-50 (Cases 251--300, 50 volumes, 100 trees; 201--250 isolated) vs. 3D U-Net (skeleton/$M_3$--$M_5$) and 5 proxies, it reaches $2.7671\pm 1.1385$ mm $CD_{CL}^{union}$ (SD 0.0415), $3.2338\pm 1.3557$ mm $CD_{CL}^{arc1mm}$, and $3.2926\pm 2.6253$ mm $CD_{ipsi}$ (arc1mm 3.7460 mm, node $p_{Holm}\le 0.0400$ vs. Ext-0b [arc1mm $p=0.1629/0.2187$]; 76.33% junction [23.04% 1-to-1], 79.65% branch F1). On Dev-14 (14 volumes, 28 trees), it reaches $2.1362\pm 0.5041$ mm $CD_{CL}^{union}$ (SD 0.0369), $2.3798\pm 0.5725$ mm $CD_{CL}^{arc1mm}$, and $2.2480\pm 0.6835$ mm $CD_{ipsi}$ (arc1mm 2.4951 mm, node $CD_{CL}^{union}$ $p_{Holm}=0.0494$ vs. Ext-0b [$CD_{ipsi}$/arc1mm $p_{Holm}=0.1353/0.0676$--$0.0906$]; 56.76%/77.74% F1@1/2mm; 79.95% junction [21.06% 1-to-1], 83.80% branch F1, 4.6880/4.9298 mm ostia), and $N=64$ $CD_{CL}^{union}=2.6291\pm 1.0629$ mm (arc1mm 3.0470, $CD_{ipsi}$ 3.0641).
Source: arXiv (Cornell University)
Authors: Jia, Zeyu, Ming, Xin
Language: English
Subfield: Radiology, Nuclear Medicine and Imaging
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W7220742516