Anatomy of the Human Thalamus Based on Spontaneous Contrast and Microscopic Voxels in High-Field Magnetic Resonance Imaging

Lemaire, Jean‐Jacques; Sakka, Laurent; Ouchchane, Lemlih; Caire, Fran çois; Gabrillargues, Jean; Bonny, Jean‐Marie

doi:10.1227/01.neu.0000365617.41061.a3

Cited by 34 publications

(37 citation statements)

References 13 publications

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“…Although many small substructures of the thalamus were identifiable (Fig 3C), a clear discrimination of all thalamic substructures, possible with longer measurement times of hours or with a higher magnetic field strength, 12 was not achievable. However, the measurement technique used in this study can be easily applied in presurgical examinations.…”

Section: Figmentioning

confidence: 98%

“…Still, this segmentation algorithm of Deoni et al requires seed points taken from anatomic atlases, which face the known problems. Just recently, Lemaire et al 12 reported that high-resolution T1-weighted measurements can be used to create images of the thalamus, which were very comparable to myelin-stained histologic sections. Such a contrast can easily be used to identify many well-known structures in individual thalami; however, the measurement time for the protocol used was during 14 hours.…”

mentioning

confidence: 99%

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Optimized 3D Magnetization-Prepared Rapid Acquisition of Gradient Echo: Identification of Thalamus Substructures at 3T

Bender¹,

Mänz²,

Korn³

et al. 2011

AJNR Am J Neuroradiol

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Section: Figmentioning

confidence: 98%

mentioning

confidence: 99%

Optimized 3D Magnetization-Prepared Rapid Acquisition of Gradient Echo: Identification of Thalamus Substructures at 3T

Bender¹,

Mänz²,

Korn³

et al. 2011

AJNR Am J Neuroradiol

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“…6). As very thin laminas are present in the thalamus [23], this local TLI increase is most probably due to a thin white matter stripe. Several of the local peaks presented in this study were only detected due to the high-resolution setting, i.e.…”

Section: Discussionmentioning

confidence: 99%

High-Resolution Laser Doppler Measurements of Microcirculation in the Deep Brain Structures: A Method for Potential Vessel Tracking

Wårdell

Hemm-Ode

Rejmstad

et al. 2016

Stereotact Funct Neurosurg

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Background: Laser Doppler flowmetry (LDF) can be used to measure cerebral microcirculation in relation to stereotactic deep brain stimulation (DBS) implantations. Objective: To investigate the microcirculation and total light intensity (TLI) corresponding to tissue grayness in DBS target regions with high-resolution LDF recordings, and to define a resolution which enables detection of small vessels. Methods: Stereotactic LDF measurements were made prior to DBS implantation with 0.5-mm steps in the vicinity to 4 deep brain targets (STN, GPi, Vim, Zi) along 20 trajectories. The Mann-Whitney U test was used to compare the microcirculation and TLI between targets, and the measurement resolution (0.5 vs. 1 mm). The numbers of high blood flow spots along the trajectories were calculated. Results: There was a significant difference (p < 0.05) in microcirculation between the targets. High blood flow spots were present at 15 out of 510 positions, 7 along Vim and GPi trajectories, respectively. There was no statistical difference between resolutions even though both local blood flow and TLI peaks could appear at 0.5-mm steps. Conclusions: LDF can be used for online tracking of critical regions presenting blood flow and TLI peaks, possibly relating to vessel structures and thin laminas along stereotactic trajectories.

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“…Since the functionally important thalamic nuclei are difficult to identify with conventional imaging modalities, several novel approaches have been developed [4,24,25,26,27,28,29,30,31,32]. Magnetic resonance diffusion tractography (probabilistic tractography) and colored FA maps can be used to visualize white matter fibers in vivo and have many applications in neurosurgery.…”

Section: Discussionmentioning

confidence: 99%

Prelemniscal Radiations: A New Reliable Landmark of the Thalamic Nucleus Ventralis Intermedius Location?

Lefranc

Carron²,

Régis³

2015

Stereotact Funct Neurosurg

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Background: The thalamic nucleus ventralis intermedius (Vim nucleus) is the main surgical target for the management of intractable tremor. The Vim nucleus cannot be reliably located with routine stereotactic imaging, and so targeting relies on indirect coordinates. Objective: We propose to investigate if colored fractional anisotropy (FA) mapping can help to locate the Vim nucleus by identifying its borders, particularly the prelemniscal radiations (Raprl) that lie below and behind the nucleus. Method: We retrospectively reviewed the colored FA maps for 18 consecutive patients having undergone gamma knife stereotactic Vim thalamotomy for disabling tremor. Results: The Raprl were easily located on colored FA maps and enabled the identification of the lower and posterior borders of the Vim nucleus in all patients. In the medial plane, the mean distance ± SD between the Raprl and Vim nucleus was 0.77 ± 1.19 mm (range: 0.1-3.3). The Raprl were located 1.35 ± 1.33 mm (range: 0.2-3.9) behind the Vim nucleus and 1.99 ± 1.23 mm (range: 0.7-4.4) below it. The mean vector distance ± SD between the Vim nucleus and the Raprl was 3 ± 1.38 mm (range: 1.25-5.2). Conclusion: The Raprl can be easily seen on colored FA maps and constitute a reliable landmark for the borders of the Vim nucleus.

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Anatomy of the Human Thalamus Based on Spontaneous Contrast and Microscopic Voxels in High-Field Magnetic Resonance Imaging

Cited by 34 publications

References 13 publications

Optimized 3D Magnetization-Prepared Rapid Acquisition of Gradient Echo: Identification of Thalamus Substructures at 3T

Optimized 3D Magnetization-Prepared Rapid Acquisition of Gradient Echo: Identification of Thalamus Substructures at 3T

High-Resolution Laser Doppler Measurements of Microcirculation in the Deep Brain Structures: A Method for Potential Vessel Tracking

Prelemniscal Radiations: A New Reliable Landmark of the Thalamic Nucleus Ventralis Intermedius Location?

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