Quantification of heart, pericardium, and left ventricular myocardium movements during the cardiac cycle for thoracic tumor radiotherapy
Authors Tong Y, Yin Y, Lu J, Liu T, Chen J, Cheng P, Gong G
Received 31 October 2017
Accepted for publication 20 December 2017
Published 24 January 2018 Volume 2018:11 Pages 547—554
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Ashok Kumar Pandurangan
Peer reviewer comments 3
Editor who approved publication: Dr Carlos E Vigil
Ying Tong,1,2 Yong Yin,1 Jie Lu,1 Tonghai Liu,1 Jinhu Chen,1 Pinjing Cheng,2 Guanzhong Gong1
1Department of Radiation Physics, Shandong Cancer Hospital Affiliated to Shandong University, Jinan, 2School of Nuclear Science and Technology, University of South China, Hengyang, People’s Republic of China
Purpose: The purpose of this study was to quantify variations in the heart, pericardium, and left ventricular myocardium (LVM) caused by cardiac movement using the breath-hold technique.
Patients and methods: In this study, the electrocardiography-gated four-dimensional computed tomography (CT) images of 22 patients were analyzed, which were sorted into 20 phases (0–95%) according to the cardiac cycle. The heart, pericardium, and LVM were contoured on each phase of the CT images. The positions, volume, dice similarity coefficient (DSC) in reference to 0% phase, and morphological parameters (max 3D diameter, roundness, spherical disproportion, sphericity, and surface area) in different phases of the heart, pericardium, and LVM were analyzed, which were presented as mean ± standard deviation.
Results: The mean values of displacements along the X, Y, and Z axes respectively were as follows: 1.2 mm, 0.6 mm, and 0.6 mm for the heart; 0.5 mm, 0.4 mm, and 0.8 mm for the pericardium; and 1.0 mm, 4.1 mm, and 1.9 mm for the LVM. The maximum variations in volume and DSC respectively were 16.49%±3.85% and 10.08%±2.14% for the heart, 12.62%±3.94% and 5.20%±1.54% for the pericardium, and 24.23%±11.35% and 184.33%±128.61% for the LVM. The differences in the morphological parameters between the maximum and minimum DSC phases for the heart and pericardium were not significantly different (p>0.05) but were significantly different for the LVM (p<0.05).
Conclusion: The volumetric and morphological variations of the heart were similar to those of pericardium, and all were significantly smaller than those of the LVM. This inconsistency in the volumetric and morphological variations between the LVM and the heart and pericardium indicates that special protection of the LVM should be considered.
Keywords: thoracic radiotherapy, cardiac activity, cardiac structures, variations, volume, morphology
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