Fa-hsuan Lin | National Taiwan University (original) (raw)
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Papers by Fa-hsuan Lin
2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2001
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Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1997
Here we report a new generalized approach, based on method of moment, to the quantitative analysi... more Here we report a new generalized approach, based on method of moment, to the quantitative analysis of spectral/spatial properties of radio-frequency (RF) coils used in magnetic resonance imaging (MRI). This method is especially powerful for phased array coils with the following abilities: (1) arbitrary coil geometry; (2) automatic calculation of complex current distribution, (3) B1 homogeneity map and frequency response
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Methods of Cancer Diagnosis, Therapy, and Prognosis, 2010
Magnetic resonance imaging (MRI) has contributed significantly to modern cancer diagnosis and tre... more Magnetic resonance imaging (MRI) has contributed significantly to modern cancer diagnosis and treatment planning because of its noninvasive nature, versatile image contrast, and high spatiotemporal resolution. For decades, the quest for higher sensitivity and greater spatial and/or temporal resolution has been approached by means of increasing major field strengths, enhancing gradient performance, and improving radio frequency (RF) technology. In this chapter, we present recent MRI advances that use an RF coil array to achieve “parallel” data acquisition for higher spatiotemporal resolution.
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PLoS ONE
Given that both auditory and visual systems have anatomically separate object identification (&qu... more Given that both auditory and visual systems have anatomically separate object identification ("what") and spatial ("where") pathways, it is of interest whether attention-driven cross-sensory modulations occur separately within these feature domains. Here, we investigated how auditory "what" vs. "where" attention tasks modulate activity in visual pathways using cortically constrained source estimates of magnetoencephalograpic (MEG) oscillatory activity. In the absence of visual stimuli or tasks, subjects were presented with a sequence of auditory-stimulus pairs and instructed to selectively attend to phonetic ("what") vs. spatial ("where") aspects of these sounds, or to listen passively. To investigate sustained modulatory effects, oscillatory power was estimated from time periods between sound-pair presentations. In comparison to attention to sound locations, phonetic auditory attention was associated with stronger alpha (7...
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NeuroImage, 2014
Using simultaneous acquisition from multiple channels of a radio-frequency (RF) coil array, magne... more Using simultaneous acquisition from multiple channels of a radio-frequency (RF) coil array, magnetic resonance inverse imaging (InI) achieves functional MRI acquisitions at a rate of 100ms per whole-brain volume. InI accelerates the scan by leaving out partition encoding steps and reconstructs images by solving under-determined inverse problems using RF coil sensitivity information. Hence, the correlated spatial information available in the coil array causes spatial blurring in the InI reconstruction. Here, we propose a method that employs gradient blips in the partition encoding direction during the acquisition to provide extra spatial encoding in order to better differentiate signals from different partitions. According to our simulations, this blipped-InI (bInI) method can increase the average spatial resolution by 15.1% (1.3mm) across the whole brain and from 32.6% (4.2mm) in subcortical regions, as compared to the InI method. In a visual fMRI experiment, we demonstrate that, co...
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PLoS ONE, 2014
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Frontiers in psychology, 2014
The cortical dorsal auditory stream has been proposed to mediate mapping between auditory and art... more The cortical dorsal auditory stream has been proposed to mediate mapping between auditory and articulatory-motor representations in speech processing. Whether this sensorimotor integration contributes to speech perception remains an open question. Here, magnetoencephalography was used to examine connectivity between auditory and motor areas while subjects were performing a sensorimotor task involving speech sound identification and overt repetition. Functional connectivity was estimated with inter-areal phase synchrony of electromagnetic oscillations. Structural equation modeling was applied to determine the direction of information flow. Compared to passive listening, engagement in the sensorimotor task enhanced connectivity within 200 ms after sound onset bilaterally between the temporoparietal junction (TPJ) and ventral premotor cortex (vPMC), with the left-hemisphere connection showing directionality from vPMC to TPJ. Passive listening to noisy speech elicited stronger connectiv...
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2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2001
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Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1997
Here we report a new generalized approach, based on method of moment, to the quantitative analysi... more Here we report a new generalized approach, based on method of moment, to the quantitative analysis of spectral/spatial properties of radio-frequency (RF) coils used in magnetic resonance imaging (MRI). This method is especially powerful for phased array coils with the following abilities: (1) arbitrary coil geometry; (2) automatic calculation of complex current distribution, (3) B1 homogeneity map and frequency response
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Methods of Cancer Diagnosis, Therapy, and Prognosis, 2010
Magnetic resonance imaging (MRI) has contributed significantly to modern cancer diagnosis and tre... more Magnetic resonance imaging (MRI) has contributed significantly to modern cancer diagnosis and treatment planning because of its noninvasive nature, versatile image contrast, and high spatiotemporal resolution. For decades, the quest for higher sensitivity and greater spatial and/or temporal resolution has been approached by means of increasing major field strengths, enhancing gradient performance, and improving radio frequency (RF) technology. In this chapter, we present recent MRI advances that use an RF coil array to achieve “parallel” data acquisition for higher spatiotemporal resolution.
Bookmarks Related papers MentionsView impact
PLoS ONE
Given that both auditory and visual systems have anatomically separate object identification (&qu... more Given that both auditory and visual systems have anatomically separate object identification ("what") and spatial ("where") pathways, it is of interest whether attention-driven cross-sensory modulations occur separately within these feature domains. Here, we investigated how auditory "what" vs. "where" attention tasks modulate activity in visual pathways using cortically constrained source estimates of magnetoencephalograpic (MEG) oscillatory activity. In the absence of visual stimuli or tasks, subjects were presented with a sequence of auditory-stimulus pairs and instructed to selectively attend to phonetic ("what") vs. spatial ("where") aspects of these sounds, or to listen passively. To investigate sustained modulatory effects, oscillatory power was estimated from time periods between sound-pair presentations. In comparison to attention to sound locations, phonetic auditory attention was associated with stronger alpha (7...
Bookmarks Related papers MentionsView impact
NeuroImage, 2014
Using simultaneous acquisition from multiple channels of a radio-frequency (RF) coil array, magne... more Using simultaneous acquisition from multiple channels of a radio-frequency (RF) coil array, magnetic resonance inverse imaging (InI) achieves functional MRI acquisitions at a rate of 100ms per whole-brain volume. InI accelerates the scan by leaving out partition encoding steps and reconstructs images by solving under-determined inverse problems using RF coil sensitivity information. Hence, the correlated spatial information available in the coil array causes spatial blurring in the InI reconstruction. Here, we propose a method that employs gradient blips in the partition encoding direction during the acquisition to provide extra spatial encoding in order to better differentiate signals from different partitions. According to our simulations, this blipped-InI (bInI) method can increase the average spatial resolution by 15.1% (1.3mm) across the whole brain and from 32.6% (4.2mm) in subcortical regions, as compared to the InI method. In a visual fMRI experiment, we demonstrate that, co...
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PLoS ONE, 2014
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Frontiers in psychology, 2014
The cortical dorsal auditory stream has been proposed to mediate mapping between auditory and art... more The cortical dorsal auditory stream has been proposed to mediate mapping between auditory and articulatory-motor representations in speech processing. Whether this sensorimotor integration contributes to speech perception remains an open question. Here, magnetoencephalography was used to examine connectivity between auditory and motor areas while subjects were performing a sensorimotor task involving speech sound identification and overt repetition. Functional connectivity was estimated with inter-areal phase synchrony of electromagnetic oscillations. Structural equation modeling was applied to determine the direction of information flow. Compared to passive listening, engagement in the sensorimotor task enhanced connectivity within 200 ms after sound onset bilaterally between the temporoparietal junction (TPJ) and ventral premotor cortex (vPMC), with the left-hemisphere connection showing directionality from vPMC to TPJ. Passive listening to noisy speech elicited stronger connectiv...
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