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Aberrant pyramidal tract in a patient with corona radiata infarct A diffusion tensor tractography study

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Neural Regeneration Research 2011年第13期6卷 1027-1030页

作者： Ji Heon hong sung ho Jang Department of Physical Therapy Yeungnam College of Science & TechnologyNamkuDaegu 705-703Republic of Korea Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaegu 705-717Republic of Korea

The aberrant pyramidal tract refers to the collateral pathway of the pyramidal tract through the medial lemniscus in the brainstem. A 63-year-old male patient presented with severe paralysis of the left extremities due to a right corona radiata infarct. He was able to extend the affected fingers against resistance at 2 months after stroke onset. At 6 months after stroke onset, he was able to perform some fine motor activities, as well as to walk with a nearly normal gait. Functional MRI, which was performed at 6 months after onset, showed that the contralateral primary sensorimotor cortex was activated during affected （left） hand movements. Diffusion tensor tractography results showed that at 2 weeks after stroke onset, pyramidal tracts of the affected hemisphere originated from the primary motor cortex and descended along the known pathway of the pyramidal tract with an aberrant pyramidal tract, which was bypassed through the medial lemniscus from the midbrain to the lower pons. however, the pyramidal tract from midbrain to pons in the affected hemisphere could not be depicted by diffusion tensor tractography at 6 months after stroke onset; instead, only the aberrant pyramidal tract existed for the course of the disappeared pyramidal tract. Results from this study indicate that the main motor functions of the affected extremities appeared to be controlled via the aberrant pyramidal tract with degeneration of the pyramidal tract in the brainstem of the affected hemisphere.

关键词： diffusion tensor tractography pyramidal tract aberrant pyramidal tract motor recovery cerebral infarct

Motor recovery by anterior choroidal artery territory in a patient with middle cerebral artery infarct

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Neural Regeneration Research 2010年第17期5卷 1357-1360页

作者： Ji Heon hong sung ho Jang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaegu 705-717Republic of Korea

In this study,the uninjured periventricular area of a female patient who presented with complete paralysis of the left extremities following middle cerebral artery infarction was analyzed using diffusion tensor tractography,transcranial magnetic stimulation,and functional magnetic resonance *** tensor tractography revealed interrupted corticospinal tract at the infarct lesion in the corona radiata at 2 weeks after onset,which descended through the spared periventricular area at 6 months after *** magnetic stimulation and functional magnetic resonance imaging revealed a motor pathway of the affected hand that was compatible with the lateral corticospinal *** 6 months after onset,motor function in the affected extremities recovered to normal levels,which suggested that motor function in the affected hand recovered by the corticospinal tract that passed through the spared periventricular *** arterial territory of the spared periventricular area corresponded with the anterior choroidal *** results suggest that care should be taken in spared periventricular areas in patients with lesions at the corona radiata level.

关键词： hemiparesis diffusion tensor imaging magnetic stimulation functional MRI stroke

Recovery of corticospinal tract injury following subdural hematoma removal A diffusion tensor imaging study

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Neural Regeneration Research 2010年第20期5卷 1555-1558页

作者： Ji Heon hong sung ho Jang Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University

Subdural hematoma can cause compression or damage to the neural tracts in the brain;however,very little is known about this *** report on a patient with subdural hematoma who was evaluated by diffusion tensor imaging prior to and after trephination and drainage of subdural hematoma.A 58-year-old male patient and ten age-matched normal control subjects were *** patient showed mild hemiparesis for 3 weeks prior to *** hemiparesis recovered to a nearly normal state at 5 weeks post-surgery when the follow up diffusion tensor image was *** diffusion tensor image parameters,fractional anisotropy and apparent diffusion coefficient,were measured along the corticospinal ***-operative diffusion tensor image showed that the corticospinal tract of the affected hemisphere seemed to be injured or ***,the follow up diffusion tensor image showed recovery of this corticospinal tract to a normal *** would appear that diffusion tensor images are a useful tool for evaluation of the effects of subdural hematomas on neural tracts.

关键词： subdural hematoma diffusion tensor imaging hemiparesis corticospinal tract

Functional magnetic resonance imaging and diffusion tensor tractography of the corticopontocerebellar tract in the human brain

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Neural Regeneration Research 2011年第1期6卷 76-80页

作者： Ji Heon hong sung ho Jang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam University

The anatomical organization of the corticopontocerebellar tract （CPCT） in the human brain remains poorly understood. The present study investigated probabilistic tractography of the CPCT in the human brain using diffusion tensor tractography with functional magnetic resonance imaging. CPCT data was obtained from 14 healthy subjects. CPCT images were obtained from functional magnetic resonance imaging and diffusion tensor tractography, revealing that the CPCT originated from the primary sensorimotor cortex and descended to the pontine nucleus through the corona radiata, the posterior limb of the internal capsule, and the cerebral peduncle. After crossing the pons through the transverse pontine fibers, the CPCT entered the cerebellum via the middle cerebral peduncle. however, some variation was detected in the midbrain （middle cerebral peduncle and/or medial lemniscus） and pons （ventral and/or dorsal transverse pontine fibers）. The CPCT was analyzed in 3 dimensions from the cerebral cortex to the cerebellum. These results could be informative for future studies of motor control in the human brain.

关键词： functional magnetic resonance imaging diffusion tensor image corticopontocerebellar tract: motor control: ataxia

Peri-infarct reorganization at the centrum semiovale and corona radiata A diffusion tensor tractography and functional MRI study

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Neural Regeneration Research 2011年第11期6卷 826-829页

作者： Ji Heon hong sung ho Jang Department of Physical Therapy Yeungnam College of Science & Technology Namgu Daegu 705-717 Republic of Korea Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Daegu 705-717 Republic of Korea

Peri-infarct reorganization has been reported in stroke patients with a lesion at the cerebral cortex, corona radiata, or pons, separately. however, there have been no reports describing the patients with peri-infarct reorganization at multiple levels. The present study reported a patient with a middle cerebral artery infarct who showed complete paralysis of the right extremities at stroke onset. Results showed that at 3 years after stroke onset, patient＇s motor function of the affected hand appeared to have been recovered by the motor tract, which reorganized into the anterior areas of the infarcted centrum semiovale and corona radiata, as demonstrated by diffusion tensor tractography study analyzed using functional MRI activation results. This result indicates that the human brain can show extensive brain plasticity and that saving the adjacent area or penumbra around the infarct even though the lesion from multiple levels is important for functional recovery after stroke.

关键词： diffusion tensor imaging functional MRI centrum semiovale corticospinal tract perilesional reorganization motor recovery neural regeneration

Possibility of Solid Hydrometeor Growth Zone Identification Using Radar Spectrum Width

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Advances in Atmospheric Sciences 2023年第2期40卷 317-332页

作者： sung-ho SUH Eun-ho ChoI hong-Il KIM Woonseon JUNG Flight Safety Technology Division NARO Space CenterKorea Aerospace Research Institute(KARI)508 Haban-roBongrae-myeonGoheung-gunJeollanam-do 59571Republic of Korea Research Applications Department National Institute of Meteorological Sciences33Seohobuk-roSeoqwipo-siJeju-do 63568Republic of Korea

In this study,the correlation between simulated and measured radar velocity spectrum width(σ_(v))is *** results show that the dendrites growth zones(DGZs)and needles growth zones(NGZs)mostly contain dendrites(DN)and needles(NE),***σ_(v) zones(1.11.2 m s^(-1),a differential reflectivity(ZDR)higher than 0 dB,and a cross-correlation coefficient(ρhv)less than *** contrast,prolate particles with relatively uniform shapes were observed in the NGZ withσ_(v)how that the DN exhibited a largerσ_(v) compared to the NE,and this observedσ_(v) was strongly dependent on the wind fluctuations(v’)due to turbulence or wind *** contrast,the NE exhibited a significantly smallσ_(v)~0.55 m s^(-1),which converges irrespective of v’.In addition,a strong correlation between the measuredσ_(v) values at five radar elevation angles(θ=6.2°,9.1°,13.1°,19°,and 80°)and those simulated in this study confirmed the significance of the analysis results.

关键词： spectrum width weather radar aerodynamic properties dendritic growth zone hydrometeor classifications

Three-Dimensional Numerical Model for Tsunami Propagation Passing Through An Obstacle

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China Ocean Engineering 2006年第3期20卷 509-516页

作者： sung Jin hong Byung ho ChoI Fumihiko IMAMURA Department of Civil and Environmental Engineering Sungkyunkwan University Chunchun-dong 300 Jangan-gu Suwon 440-746 Korea Disaster Control Research Center Graduate School of Engineering Tohoku University Aoba 06 Sendai 980-8579 Japan

A three-dimensional numerical tsunami model is developed to analyze the nonlinear behavior of flow around obstacles with the Marker and Cell （MAC） method based on the Navier-Stokes equations. Tnrough a comparison with experimental data for the cases of dam break and solitary wave propagation, verification of the three-dimensional numerical model is given. Numerical experiment is performed for the analysis of the nonlinear behavior of flow around obstacles and compared with experimental data. The velocity and pressure around obstacles are presented with sufficient accuracy for tstmami propagation passing through an obstacle.

关键词： three-dimensional numericxtl model tsunami Navier-Stokes equations Marker and Ceml (MAC) method

Is combined functional magnetic resonance imaging and diffusion tensor tractography a useful tool for evaluation of somatosensory dysfunction recovery after intracerebral hemorrhage?

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Neural Regeneration Research 2010年第14期5卷 1109-1112页

作者： Ji Heon hong sung ho Jang Department of Physical Medicine & Rehabilitation Yeungnam University College of Medicine

Diffusion tensor tractography allows the sensory fiber course of the medial lemniscus to be visualized. But diffusion tensor tractography for accurate evaluation of the repair of injured somatosensory tracts in stroke patients has been rarely reported. A 55-year-old female patient presented with severe somatosensory dysfunction of the left side caused by a spontaneous intracerebral hemorrhage on the right side. The somatosensory function of the affected side recovered to a nearly normal state at 7 weeks from onset. Functional magnetic resonance imaging revealed that at 3 weeks from onset, there was no cortical activation by touch at each hand; at 7 weeks, the contralateral cortex centered on the primary sensory cortex was found to be activated during touch and passive movements, and activation by passive movements was increased compared with that at 3 weeks. Diffusion tensor tractography revealed that a medial lemniscus on the affected （right） hemisphere was not observed at 3 weeks from onset, however, at 7 weeks, the unaffected （left） hemisphere passed along the medial lemniscus pathway from the pons to the primary sensory cortex. These findings indicate that combined functional magnetic resonance imaging and diffusion tensor tractography would allow more accurate evaluation of the architecture and integrity of somatosensory tracts and is a useful method to investigate the recovery of somatosensory dysfunction in stroke patients.

关键词： functional magnetic resonance imaging diffusion tensor tractography stroke somatosensory recovery intracerebral hemorrhage brain injury

Diffusion tensor imaging for measuring recovery from cerebellar peduncle injury due to intracerebral hemorrhage: A case report

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Neural Regeneration Research 2010年第12期5卷 954-957页

作者： Ji Heon hong sung ho Jang Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University

Diffusion tensor tractography （DTT） in diffusion tensor imaging （DTI） examination allows for the three-dimensional visualization of cerebellar peduncles. The present case-control study analyzed the relationship between functional recovery of intracerebral hematoma patient and cerebellar peduncle injury, as detected by DTI. The enrolled patient could not sit at 3 weeks after onset, but was able to walk independently and perform most daily activities after 4 months. The 3-week DTT images revealed that all six cerebellar peduncles were compressed by the hematoma, posterior portions of all three left cerebellar peduncles were shortened, and the left middle cerebellar peduncle was interrupted in the mid-portion. The 4-week DTT images showed that all compressed cerebellar peduncles were ameliorated, although injured posterior portions of the three left cerebellar peduncles did not recover. The fractional anisotropy value of the right inferior cerebellar peduncle increased from two standard deviations below the normal control value to within two standard deviations of the normal control value. These findings suggested that functional recovery was primarily due to decompression of compressed cerebellar peduncles, and not to recovery of injured cerebellar peduncles. DTI evaluations of cerebellar peduncles could be helpful when cerebellar peduncle injury is suspected.

关键词： diffuse tensor imaging cerebellar peduncle injury intracerebral hematoma brain injury cerebellar peduncle