A functional magnetic resonance imaging study of listening comprehension of languages in human at 3 tesla-comprehension level and activation of the language areas

Nakai, Toshiharu; Matsuo, Keizo; Kato, Chikako; Matsuzawa, Masako; Okada, Tomohisa; Glover, Gary H.; Moriya, Tetsuo; Inui, Tomoyuki

doi:10.1016/s0304-3940(99)00103-2

Cited by 47 publications

(40 citation statements)

References 17 publications

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“…As is apparent in Figs. 2-6 with TE ϭ 1.5 ms and a voxel volume of 0.62-073 mm 3 , we did not experience substantial signal dropout in the vessels, which would be expected as the T* 2 drops below TE. Comparison of Fig.…”

Section: Discussionmentioning

confidence: 50%

“…The pulse sequence was "high efficiency" in that data sampling accounted for 66% of the TR interval. Depending on the section thickness, the voxel size was 0.529 ϫ 0.982 ϫ 1.2-1.4 mm ϭ 0.62-0.73 mm 3 (before 3-direction zero-filling). We validated the protocol on volunteers prior to patient use to verify that no peripheral nerve stimulation was experienced.…”

Section: Methodsmentioning

confidence: 99%

“…Assuming a TR ϭ 6.7 ms and vessel T 1 s of 47 and 50 ms at 1.5 and 3.0T respectively, the 3.0T vessel S/N can be estimated from Eqs. [3] and [4] to be r ϫ ͌(47/50) ϭ 2.08 times the S/N at 1.5T, or approximately doubled. In addition, for other MRA techniques which use a longer TR, like 3DTOF angiography (TR ϭ 30 -40 ms), the increased T 1 of brain parenchyma at 3.0T is advantageous for increasing vessel-to-background C/N.…”

Section: Cemra At 30tmentioning

confidence: 99%

“…Figure 3 shows a 34-year-old female with a 6 -7 mm saccular right middle cerebral trifurcation aneurysm (arrow). The 0.62-mm 3 voxel volume of the CEMRA study is sufficiently small for good quality volume rendering, as illustrated by Fig. 3c.…”

Section: Cemra At 30tmentioning

confidence: 99%

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High‐resolution intracranial and cervical MRA at 3.0T: Technical considerations and initial experience

Huston¹,

Chen²,

Gibbs³

et al. 2001

Magn. Reson. Med.

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Initial experience with intracranial and cervical MRA at 3.0T is reported. Phantom measurements (corrected for relaxation effects) show S/N (3.0T) ‫؍‬ 2.14 ؎ 0.08 ؋ S/N (1.5T) in identical-geometry head coils. A 3.0T 3DTOF intracranial imaging protocol with higher-order autoshimming was developed and compared to 1.5T 3DTOF in 12 patients with aneurysms. A comparison by two radiologists showed the 3.0T to be significantly better (P < 0.001) for visualization of the aneurysms. The feasibility of cervical and intracranial contrast enhanced MR angiography (CEMRA) at 3.0T is also examined. The relaxivity of the gadolinium contrast agent decreases by only about 4 -7% when the field strength is increased from 1.5 to 3.0T. Cervical 3.0T CEMRA was obtained in eight patients, two of whom had 1.5T studies available for direct comparison. Image comparison suggests 3.0T to be a favorable field strength for cervical CEMRA. Voxel volumes of 0.62-0.73 mm 3 (not including zero-filling) were readily achieved at 3.0T with the use of a single-channel transmitreceive head or cervical coil, a 25 mL bolus of gadoteridol, and a 3D pulse sequence with a 66% sampling efficiency. This spatial resolution allowed visualization of intracranial aneurysms, carotid dissections, and atherosclerotic disease including ulcerations. Potential drawbacks of 3.0T MRA are increased SAR and T* 2 dephasing compared to 1.5T. Image comparison suggests signal loss due to T* 2 dephasing will not be substantially more problematic than at 1.5T. The 1998 revision of the U.S. Food and Drug Administration guidelines (1) states that MRI systems with main static field strengths of 4.0T and less can qualify as nonsignificant risk devices. Moreover, with the advent of actively shielded magnet technology it is now feasible to site a 3.0T scanner in a clinical setting. Much of the prior use of 3.0T and higher field strength MRI systems, however, has been for pure or clinical research, mostly in the fields of functional brain MRI (e.g., 2,3) and spectroscopy (e.g., 4). This is quite logical, since fMRI and spectroscopy benefit not only from the increased S/N of 3.0T, but also from the linear dependence of magnetic susceptibility changes and chemical shift, respectively.We have applied our 3.0T system to both clinical research and routine clinical use. During the period October 1999 to May 2001, 2908 routine clinical brain exams were performed in an outpatient setting (5). The purpose of this article is twofold: 1) to provide an initial comparison of intracranial 3D time of flight (3DTOF) magnetic resonance angiography (MRA) at 1.5 and 3.0T; and 2) to establish the initial feasibility of 3D contrast-enhanced MR angiography (CEMRA) for the cervical and intracranial arteries at 3.0T. CEMRA is already a well-established technique at 1.5T and has been applied previously to study both intracranial aneurysms (6) and the cervical arteries (7). We examined whether the increased S/N available at 3.0T can translate into increased spatial resolution for CEMRA. We believe that the de...

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Section: Discussionmentioning

confidence: 50%

Section: Methodsmentioning

confidence: 99%

Section: Cemra At 30tmentioning

confidence: 99%

Section: Cemra At 30tmentioning

confidence: 99%

See 2 more Smart Citations

High‐resolution intracranial and cervical MRA at 3.0T: Technical considerations and initial experience

Huston¹,

Chen²,

Gibbs³

et al. 2001

Magn. Reson. Med.

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“…(Hart and Gordon, 1990)) and neuroimaging studies (e.g. (Nakai et al, 1999;Newman et al, 2001)). The angular gyrus may also be of importance developmentally; decreased activation in the left angular gyrus was shown in a cohort of children with early lead exposure relative to normal controls in a verbal fluency task (Sohn et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Cognitive modules utilized for narrative comprehension in children: a functional magnetic resonance imaging study

2006

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The ability to comprehend narratives constitutes an important component of human development and experience. The neural correlates of auditory narrative comprehension in children were investigated in a large-scale functional magnetic resonance imaging (fMRI) study involving 313 subjects ages 5-18. Using group Independent Component Analysis (ICA), bilateral task-related components were found comprising the primary auditory cortex, the mid-superior temporal gyrus, the hippocampus, the angular gyrus and medial aspect of the parietal lobule (precuneus/posterior cingulate). In addition, a right-lateralized component was found involving the most posterior aspect of the superior temporal gyrus, and a left-lateralized component was found comprising the inferior frontal gyrus (including Broca's area), the inferior parietal lobule, and the medial temporal gyrus. Using a novel data-driven analysis technique, increased task-related activity related to age was found in the components comprising the mid-superior temporal gyrus (Wernicke's area) and the posterior aspect of the superior temporal gyrus, while decreased activity related to age was found in the component comprising the angular gyrus. The results are discussed in light of recent hypotheses involving the functional segregation of Wernicke's area and the specific role of the mid-superior temporal gyrus in speech comprehension.

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Hemodynamic Studies of Syntactic Processing

Indefrey¹

2012

The Handbook of the Neuropsychology of Language

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A functional magnetic resonance imaging study of listening comprehension of languages in human at 3 tesla-comprehension level and activation of the language areas

Cited by 47 publications

References 17 publications

High‐resolution intracranial and cervical MRA at 3.0T: Technical considerations and initial experience

High‐resolution intracranial and cervical MRA at 3.0T: Technical considerations and initial experience

Cognitive modules utilized for narrative comprehension in children: a functional magnetic resonance imaging study

Hemodynamic Studies of Syntactic Processing

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