Jun Yang1, Zeyan Xu2, Jingyan Gao3, Chengde Liao2, Pengfei Wang4, Yifan Liu2, Tengfei Ke2, Qinqing Li5, Dan Han6. 1. Department of Radiology, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, No. 519 Kunzhou Road, Xishan District, Kunming 650118, Yunnan, PR China; Department of Medical Imaging, The First Affiliated Hospital of Kunming Medical University, No. 295 Xichang Road, Kunming 650032, Yunnan, PR China. 2. Department of Radiology, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, No. 519 Kunzhou Road, Xishan District, Kunming 650118, Yunnan, PR China. 3. Department of Radiation Oncology, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, No. 519 Kunzhou Road, Xishan District, Kunming 650118, Yunnan, PR China. 4. Department of Key Laboratory, The 2nd Affiliated Hospital of Kunming Medical University, No. 374 Dianmian Road, Kunming 650101, Yunnan, PR China. 5. Department of Radiology, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, No. 519 Kunzhou Road, Xishan District, Kunming 650118, Yunnan, PR China. Electronic address: qinqing_81@163.com. 6. Department of Medical Imaging, The First Affiliated Hospital of Kunming Medical University, No. 295 Xichang Road, Kunming 650032, Yunnan, PR China. Electronic address: kmhandan@sina.com.
Abstract
PURPOSE: Radiation injury is a serious threat to humans that requires prompt and accurate diagnosis and assessment. Currently, there is no effective imaging method to evaluate acute radiation injury in the early stage. We used hybrid multifunctional MRI to evaluate acute radiation-induced brain injury. MATERIALS AND METHODS: Different extents of brain injury were created by exposing SD rats to different radiation doses, namely, 0, 10, 20, 30 and 40 Gy. DCE, IVIM-MRI and MRS were performed on the 5th day after irradiation. Immunohistochemistry, western blotting and electron microscopy were used to determine histopathological changes in neurons and glial cells. RESULTS: The Ktrans, Ve, and iAUC values in DCE and the S0, f and D* values in IVIM showed significant positive correlations with injury grade. In particular, Ktrans, iAUC and S0 showed very good correlations with injury grade (r > 0.5, P < 0.05), and the values in the 30 Gy group were significantly higher than those in the other groups (P < 0.05). The NAA/Cr ratio in the 30 Gy group was significantly lower than those in the other groups, whereas the NAA/Cho ratio increased from the 10 Gy to the 20 Gy group and decreased significantly in the 30 Gy group (P < 0.05). VEGF, Caspase-3 and GFAP increased with irradiation dose increasing from 10 Gy to 30 Gy (P < 0.05). ROC analysis demonstrated that multifunctional MRI was more effective for diagnosing the 30 Gy group than it was for the 10 Gy and 20 Gy groups. CONCLUSION: Hybrid multifunctional MRI can noninvasively evaluate acute radiation-induced brain injury in the early stage, particularly high-dose radiation exposure.
PURPOSE:Radiation injury is a serious threat to humans that requires prompt and accurate diagnosis and assessment. Currently, there is no effective imaging method to evaluate acute radiation injury in the early stage. We used hybrid multifunctional MRI to evaluate acute radiation-induced brain injury. MATERIALS AND METHODS: Different extents of brain injury were created by exposing SD rats to different radiation doses, namely, 0, 10, 20, 30 and 40 Gy. DCE, IVIM-MRI and MRS were performed on the 5th day after irradiation. Immunohistochemistry, western blotting and electron microscopy were used to determine histopathological changes in neurons and glial cells. RESULTS: The Ktrans, Ve, and iAUC values in DCE and the S0, f and D* values in IVIM showed significant positive correlations with injury grade. In particular, Ktrans, iAUC and S0 showed very good correlations with injury grade (r > 0.5, P < 0.05), and the values in the 30 Gy group were significantly higher than those in the other groups (P < 0.05). The NAA/Cr ratio in the 30 Gy group was significantly lower than those in the other groups, whereas the NAA/Cho ratio increased from the 10 Gy to the 20 Gy group and decreased significantly in the 30 Gy group (P < 0.05). VEGF, Caspase-3 and GFAP increased with irradiation dose increasing from 10 Gy to 30 Gy (P < 0.05). ROC analysis demonstrated that multifunctional MRI was more effective for diagnosing the 30 Gy group than it was for the 10 Gy and 20 Gy groups. CONCLUSION: Hybrid multifunctional MRI can noninvasively evaluate acute radiation-induced brain injury in the early stage, particularly high-dose radiation exposure.
Authors: Bo Xu Ren; Isaac Huen; Zi Jun Wu; Hong Wang; Meng Yun Duan; Ilonka Guenther; K N Bhanu Prakash; Feng Ru Tang Journal: BMC Neurosci Date: 2021-04-21 Impact factor: 3.288