DSpace Collection:
http://hdl.handle.net/10722/44497
2024-03-29T02:21:08Z
2024-03-29T02:21:08Z
Bold signal changes of the visual cortex on stimulation of the vision-related acupoints
Li, G
Cheung, RTF
Ma, QY
Yang, ES
http://hdl.handle.net/10722/54078
2020-06-26T07:04:26Z
2002-01-01T00:00:00Z
Title: Bold signal changes of the visual cortex on stimulation of the vision-related acupoints
Authors: Li, G; Cheung, RTF; Ma, QY; Yang, ES
Abstract: We verified Cho and his colleagues' acupoints using conventional acupuncture and electro-acupuncture. Acupuncture was performed with two different techniques - conventional and electro-acupuncture. Functional MR imaging (fMRI) was performed using a 1.5 T MR scanner with standard scan parameters in 13 healthy volunteers. The 30-second activation period was alternated by 30-second rest period. First, the fMRI was performed with visual activation using light-emitting diodes (LED) flashing with a frequency of 8 Hz. The fMRI was then repeated with conventional acupuncture and electro-acupuncture at the following acupoints (BL60, BL 65, BL 66 and BL 67) located in the lateral aspect of the foot. The activated pixels in the visual cortex created by visual activation correlate well with those created by both conventional acupuncture and electro-acupuncture Fig. 1. The results obtained by conventional acupuncture stimulation have relatively more neural responses due to other types of stimulation rather than visual activation. The neural responses obtained by electro-acupuncture at 2 Hz was found to be stronger than those obtained by electro-acupuncture at 64 Hz. The greatest difficulty encountered by the researchers is that only 25 to 30% of the subjects undergoing acupuncture renders expected neural response.
Supported by The Hong Kong Jockey Club Charities Trust and The Hong Kong University Foundation.
2002-01-01T00:00:00Z
Diffusion tensor-based fiber tracking in cervical spinal cord with a 3T MRI
Ng, MC
Hu, Y
Wu, EX
Yang, ES
Luk, KDK
http://hdl.handle.net/10722/45903
2019-05-24T07:04:07Z
2006-01-01T00:00:00Z
Title: Diffusion tensor-based fiber tracking in cervical spinal cord with a 3T MRI
Authors: Ng, MC; Hu, Y; Wu, EX; Yang, ES; Luk, KDK
Abstract: The protocol for spinal DTI nntl tractography with high SNR and spatial resolution has been developed arid tested on G healthy subjects and 1 CSM patient in a 3T system. Fiber bundlex were traced and were found running parallel to the cervical spinal cord correlating with the neuronal anatomy in normal subjects. The FA maps showed consistent low FA region connecting all spinal levels, which corresponded lo the grey matter structure in anatomical imaging, Spinal DTI in CSM showed diffusivity increase at compression sites. The proposed diffusion eigenvector-based method was able to differentiate between λa and λr even when there was a draxtic diffusivity change at compressed regions in CSM, which may facilitate better understanding of the pathophysiology of CSM. Our results indicated that using the current imaging and post-procensing protocols, spinal DTI can fm achieved with better grey white matter contrast, high inter-subject reproducibility and diagnostic ability. © 2006 IEEE.
2006-01-01T00:00:00Z