InVesalius Navigator, a free and open-source software for navigated transcranial magnetic stimulation

Souza, Victor Hugo de Oliveira e; Matsuda, Renan Hiroshi; Peres, Arsênio Sales; Amorim, Paulo; Moraes, Thiago; Silva, Joana Frade da; Baffa, Oswaldo

doi:10.1016/j.brs.2018.12.894

Cited by 4 publications

(4 citation statements)

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Section: Discussionmentioning

confidence: 99%

“…Our approach requires a priori information from a high spatial resolution imaging that carries brain anatomy information of each volunteer. Here, we opted to use structural MRI images, but other neuronavigation systems (as well as ours) can also work with computed tomography (CT) scans ( Rubianes Silva, 2017 ; Souza et al, 2018 , 2019 ). The validation of our approach shows that by adding spatial information to the protocol, we were able to improve the within-subject reproducibility of the fNIRS results by an average factor of almost three in the region of interest ( Table 2 ).…”

Section: Discussionmentioning

confidence: 99%

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Integration of Spatial Information Increases Reproducibility in Functional Near-Infrared Spectroscopy

et al. 2020

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As functional near-infrared spectroscopy (fNIRS) is developed as a neuroimaging technique and becomes an option to study a variety of populations and tasks, the reproducibility of the fNIRS signal is still subject of debate. By performing test-retest protocols over different functional tasks, several studies agree that the fNIRS signal is reproducible over group analysis, but the inter-subject and within-subject reproducibility is poor. The high variability at the first statistical level is often attributed to global systemic physiology. In the present work, we revisited the reproducibility of the fNIRS signal during a finger-tapping task across multiple sessions on the same and different days. We expanded on previous studies by hypothesizing that the lack of spatial information of the optodes contributes to the low reproducibility in fNIRS, and we incorporated a realtime neuronavigation protocol to provide accurate cortical localization of the optodes. Our proposed approach was validated in 10 healthy volunteers, and our results suggest that the addition of neuronavigation can increase the within-subject reproducibility of the fNIRS data, particularly in the region of interest. Unlike traditional approaches to positioning the optodes, in which low intra-subject reproducibility has been found, we were able to obtain consistent and robust activation of the contralateral primary motor cortex at the intra-subject level using a neuronavigation protocol. Overall, our findings support the hypothesis that at least part of the variability in fNIRS cannot be only attributed to global systemic physiology. The use of neuronavigation to guide probe positioning, as proposed in this work, has impacts to longitudinal protocols performed with fNIRS.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Integration of Spatial Information Increases Reproducibility in Functional Near-Infrared Spectroscopy

et al. 2020

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“…The sEMG signals were processed using the Signal Hunter 19 software (Figure 2) (https://github.com/biomaglab/signalhunter). The MEPs were extracted within a time window between 15 and 60 ms after the TMS pulse to quantify their peak‐to‐peak amplitudes.…”

Section: Methodsmentioning

confidence: 99%

Effect of muscle length in a handgrip task on corticomotor excitability of extrinsic and intrinsic hand muscles under resting and submaximal contraction conditions

Moraes,

Vargas,

Ramalho

et al. 2023

Scandinavian Med Sci Sports

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The neurophysiological mechanisms underlying muscle force control for different wrist postures still need to be better understood. To further elucidate these mechanisms, the present study aimed to investigate the effects of wrist posture on the corticospinal excitability by transcranial magnetic stimulation (TMS) of extrinsic (flexor [FCR] and extensor carpi radialis [ECR]) and intrinsic (flexor pollicis brevis (FPB)) muscles at rest and during a submaximal handgrip strength task. Fourteen subjects (24.06 ± 2.28 years) without neurological or motor disorders were included. We assessed how the wrist posture (neutral: 0°; flexed: +45°; extended: −45°) affects maximal handgrip strength (HGSmax) and the motor evoked potentials (MEP) amplitudes during rest and active muscle contractions. HGSmax was higher at 0° (133%) than at −45° (93.6%; p < 0.001) and +45° (73.9%; p < 0.001). MEP amplitudes were higher for the FCR at +45° (83.6%) than at −45° (45.2%; p = 0.019) and at +45° (156%; p < 0.001) and 0° (146%; p = 0.014) than at −45° (106%) at rest and active condition, respectively. Regarding the ECR, the MEP amplitudes were higher at −45° (113%) than at +45° (60.8%; p < 0.001) and 0° (72.6%; p = 0.008), and at −45° (138%) than +45° (96.7%; p = 0.007) also at rest and active conditions, respectively. In contrast, the FPB did not reveal any difference among wrist postures and conditions. Although extrinsic and intrinsic hand muscles exhibit overlapping cortical representations and partially share the same innervation, they can be modulated differently depending on the biomechanical constraints.

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“…It maximally reflected the pronounced structural features, including those arising as a result of bone tissue resection. The CT data in DICOM format were processed by the Invesalius software package [22]. In this case, the bone tissue of the skull was isolated and visualized from the entire data array.…”

Section: Methodsmentioning

confidence: 99%

Computer simulation of stress-strain states in zygomatic bones after complex installation of implants

Dibirov,

Drobyshev,

Kharazyan

et al. 2023

Frattura Ed Integrità Strutturale

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The research addresses evaluation of stress-strain state (SSS) in the “zygomatic bones–implants–denture base” system by varying the type and number of the zygomatic implants, as well as applying loads. The load magnitude was varied over a wide range, characteristic of the mastication process. Changing the adhesion conditions at the “zygomatic implant–bone tissue” interface varied both the level of maximum stress and the location of the critical stress concentrator. The local violation of the integrity of bone tissue in the skull was one of the key reasons for the redistribution of stresses in the “zigomatic implantdenture base” system. Such a phenomenon should be primarily taken into account when choosing the standard sizes of installed zygomatic implants in order to reduce the compliance of weakened areas of the skull (as the basis of the load-bearing structure). Based on the results of the FEM-based computer simulation, the algorithm was proposed for planning prosthetic treatment, which involves the iterative method for selecting both size and location of installing zygomatic implants depending on the results of the SSS calculation and the onset of a critical condition (primarily in bone tissue at the contact area with zygomatic implants).

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InVesalius Navigator, a free and open-source software for navigated transcranial magnetic stimulation

Cited by 4 publications

References 0 publications

Integration of Spatial Information Increases Reproducibility in Functional Near-Infrared Spectroscopy

Integration of Spatial Information Increases Reproducibility in Functional Near-Infrared Spectroscopy

Effect of muscle length in a handgrip task on corticomotor excitability of extrinsic and intrinsic hand muscles under resting and submaximal contraction conditions

Computer simulation of stress-strain states in zygomatic bones after complex installation of implants

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