Quantitative imaging of spontaneous neuromagnetic activity for assessing cerebral ischemia using sLORETA-qm
| Autor: | Kenji Ohata, Yuzo Terakawa, Naohiro Tsuyuguchi, Hiroaki Tanaka, Hiroki Sawa, Akira Satone, Yukio Miki, Yoshinobu Takahashi, Mitsuhiro Hara, Wataru Ide, Ikuo Hashimoto, Hajime Kamada, Yuichi Inoue, Shinichi Sakamoto, Kazumi Nitta |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Cognitive Neuroscience Ischemia computer.software_genre Brain Ischemia Voxel medicine.artery Image Processing Computer-Assisted medicine Humans Aged Cerebral Cortex medicine.diagnostic_test business.industry Cerebral infarction Dysarthria Brain Magnetoencephalography Electroencephalography Cerebral Infarction Middle Aged medicine.disease Magnetic Resonance Imaging Paresis Neurology Cerebral blood flow Positron emission tomography Positron-Emission Tomography Anesthesia Tomography Internal carotid artery Nuclear medicine business computer |
| Zdroj: | NeuroImage. 49:488-497 |
| ISSN: | 1053-8119 |
| DOI: | 10.1016/j.neuroimage.2009.07.039 |
| Popis: | To image cerebral neural activity in ischemic areas, we proposed a novel technique to analyze spontaneous neuromagnetic fields based on standardized low-resolution brain electromagnetic tomography modified for a quantifiable method (sLORETA-qm). Using a 160-channel whole-head-type magnetoencephalographic system, cerebral magnetic fields were obtained pre- and postoperatively from 5 patients with unilateral internal carotid artery occlusive disease and 16 age-matched healthy volunteers. For quantitative imaging, voxel-based time-averaged intensities of slow waves in 4 frequency bands (0.3–2 Hz, 2–4 Hz, 4–6 Hz and 6–8 Hz) were obtained by the proposed technique based on sLORETA-qm. Positron emission tomography with 15 O gas inhalation ( 15 O-PET) was also performed in these patients to evaluate cerebral blood flow and metabolism. In all 5 patients, slow waves in every frequency band were distributed in the area of cerebrovascular insufficiency, as confirmed by 15 O-PET preoperatively. In 4 patients, slow-wave intensities in theta bands (4–6 Hz, 6–8 Hz) decreased postoperatively along with improvements in cerebral blood flow and metabolism, whereas delta bands (0.3–2 Hz, 2–4 Hz) showed no significant differences between pre- and postoperatively. One patient with deterioration of cerebral infarction after surgery showed marked increases in slow-wave intensities in delta bands (0.3–2 Hz, 2–4 Hz) postoperatively, with distribution close to the infarct region. The proposed quantitative imaging of spontaneous neuromagnetic fields enabled clear visualization and alternations of cerebral neural conditions in the ischemic area. This technique may offer a novel, non-invasive method for identifying cerebral ischemia, although further studies in a larger number of patients are warranted. |
| Databáze: | OpenAIRE |
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