Technical Note: 4D cone-beam CT reconstruction from sparse-view CBCT data for daily motion assessment in pencil beam scanned proton therapy (PBS-PT)

被引:9
作者
den Otter, Lydia A. [1 ]
Chen, Kuanling [2 ]
Janssens, Guillaume [3 ]
Meijers, Arturs [1 ]
Both, Stefan [1 ]
Langendijk, Johannes A. [1 ]
Rosen, Lane R. [2 ]
Wu, Hsinshun T. [2 ]
Knopf, Antje-Christin [1 ]
机构
[1] Univ Groningen, Univ Med Ctr Groningen, Dept Radiat Oncol, NL-9713 GZ Groningen, Netherlands
[2] Willis Knighton Canc Ctr, Dept Radiat Oncol, Shreveport, LA USA
[3] Ion Beam Applicat, Res & Dev, Louvain La Neuve, Belgium
关键词
4D‐ CBCT; image reconstruction; inter‐ fractional motion; Lung cancer; pencil beam scanning; proton therapy;
D O I
10.1002/mp.14521
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose The number of pencil beam scanned proton therapy (PBS-PT) facilities equipped with cone-beam computed tomography (CBCT) imaging treating thoracic indications is constantly rising. To enable daily internal motion monitoring during PBS-PT treatments of thoracic tumors, we assess the performance of Motion-Aware RecOnstructiOn method using Spatial and Temporal Regularization (MA-ROOSTER) four-dimensional CBCT (4DCBCT) reconstruction for sparse-view CBCT data and a realistic data set of patients treated with proton therapy. Methods Daily CBCT projection data for nine non-small cell lung cancer (NSCLC) patients and one SCLC patient were acquired at a proton gantry system (IBA Proteus (R) One). Four-dimensional CBCT images were reconstructed applying the MA-ROOSTER and the conventional phase-correlated Feldkamp-Davis-Kress (PC-FDK) method. Image quality was assessed by visual inspection, contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR), and the structural similarity index measure (SSIM). Furthermore, gross tumor volume (GTV) centroid motion amplitudes were evaluated. Results Image quality for the 4DCBCT reconstructions using MA-ROOSTER was superior to the PC-FDK reconstructions and close to FDK images (median CNR: 1.23 [PC-FDK], 1.98 [MA-ROOSTER], and 1.98 [FDK]; median SNR: 2.56 [PC-FDK], 4.76 [MA-ROOSTER], and 5.02 [FDK]; median SSIM: 0.18 [PC-FDK vs FDK], 0.31 [MA-ROOSTER vs FDK]). The improved image quality of MA-ROOSTER facilitated GTV contour warping and realistic motion monitoring for most of the reconstructions. Conclusion MA-ROOSTER based 4DCBCTs performed well in terms of image quality and appear to be promising for daily internal motion monitoring in PBS-PT treatments of (N)SCLC patients.
引用
收藏
页码:6381 / 6387
页数:7
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