Four-Dimensional MRI Using Three-Dimensional Radial Sampling with Respiratory Self-Gating to Characterize Temporal Phase-Resolved Respiratory Motion in the Abdomen

被引:74
作者
Deng, Zixin [1 ,2 ]
Pang, Jianing [1 ,3 ]
Yang, Wensha [4 ]
Yue, Yong [4 ]
Sharif, Behzad [1 ]
Tuli, Richard [4 ]
Li, Debiao [1 ,2 ]
Fraass, Benedick [4 ]
Fan, Zhaoyang [1 ]
机构
[1] Cedars Sinai Med Ctr, Dept Biomed Sci, Biomed Imaging Res Inst, Los Angeles, CA 90048 USA
[2] Univ Calif Los Angeles, Dept Bioengn, Los Angeles, CA USA
[3] Northwestern Univ, Dept Radiol & Biomed Engn, Chicago, IL 60611 USA
[4] Cedars Sinai Med Ctr, Dept Radiat Oncol, Los Angeles, CA 90048 USA
关键词
4D-MRI; 3D radial sampling; self-gating; respiratory motion; hysteresis; radiotherapy planning; HEART CORONARY MRA; CARDIAC CINE MRI; K-T BLAST; DYNAMIC MRI; RADIOTHERAPY; RECONSTRUCTION; SENSE; COMPENSATION; VARIABILITY; ANGIOGRAPHY;
D O I
10.1002/mrm.25753
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: To develop a four-dimensional MRI (4D-MRI) technique to characterize the average respiratory tumor motion for abdominal radiotherapy planning. Methods: A continuous spoiled gradient echo sequence was implemented with 3D radial trajectory and 1D self-gating for respiratory motion detection. Data were retrospectively sorted into different respiratory phases based on their temporal locations within a respiratory cycle, and each phase was reconstructed by means of a self-calibrating CG-SENSE program. Motion phantom, healthy volunteer and patient studies were performed to validate the respiratory motion detected by the proposed method against that from a 2D real-time protocol. Results: The proposed method successfully visualized the respiratory motion in phantom and human subjects. The 4D-MRI and real-time 2D-MRI yielded comparable superior-inferior (SI) motion amplitudes (intraclass correlation = 0.935) with up-to one pixel mean absolute differences in SI displacements over 10 phases and high cross-correlation between phase-resolved displacements (phantom: 0.985; human: 0.937-0.985). Comparable anterior-posterior and left-right displacements of the tumor or gold fiducial between 4D and real-time 2D-MRI were also observed in the two patients, and the hysteresis effect was shown in their 3D trajectories. Conclusion: We demonstrated the feasibility of the proposed 4D-MRI technique to characterize abdominal respiratory motion, which may provide valuable information for radiotherapy planning. (C) 2015 Wiley Periodicals, Inc.
引用
收藏
页码:1574 / 1585
页数:12
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