scholarly journals Measurement of Tongue Tip Velocity from Real-Time MRI and Phase-Contrast Cine-MRI in Consonant Production

2020 ◽  
Vol 6 (5) ◽  
pp. 31 ◽  
Author(s):  
Karyna Isaieva ◽  
Yves Laprie ◽  
Freddy Odille ◽  
Ioannis K. Douros ◽  
Jacques Felblinger ◽  
...  
Keyword(s):  
Real Time ◽  
Phase Contrast ◽  
Sagittal Plane ◽  
Cine Mri ◽  
Resonance Imaging ◽  
Phase Contrast Mri ◽  
French Speaking ◽  
Magnetic Resonance Imaging Mri ◽  
Tip Velocity ◽  
Approach Phase

We evaluate velocity of the tongue tip with magnetic resonance imaging (MRI) using two independent approaches. The first one consists in acquisition with a real-time technique in the mid-sagittal plane. Tracking of the tongue tip manually and with a computer vision method allows its trajectory to be found and the velocity to be calculated as the derivative of the coordinate. We also propose to use another approach—phase contrast MRI—which enables velocities of the moving tissues to be measured directly. We recorded the sound simultaneously with the MR acquisition which enabled us to make conclusions regarding the relation between the movements and the sound. We acquired the data from two French-speaking subjects articulating /tata/. The results of both methods are in qualitative agreement and are consistent with other reviewer techniques used for evaluation of the tongue tip velocity.

Magnetic Resonance Imaging to Investigate the Clinical Applicability of the Medial Femoral Trochlea Osteochondral Flap Within the Wrist

Hand ◽  
2022 ◽  
pp. 155894472110643
Author(s):  
Jimmy H. Daruwalla ◽  
Jan Skrok ◽  
Mitchell A. Pet ◽  
Aviram M. Giladi ◽  
James P. Higgins
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Sagittal Plane ◽  
Convex Surface ◽  
Radius Of Curvature ◽  
Resonance Imaging ◽  
Femoral Trochlea ◽  
Average Ratio ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri

Background: The medial femoral trochlea (MFT) osteochondral flap is employed for reconstruction of unsalvageable scaphoid proximal pole nonunions. The convex surface of the cartilage-bearing proximal trochlea is used to replace the similarly contoured proximal scaphoid and articulate with the concave scaphoid fossa of the radius. A magnetic resonance imaging (MRI) comparison of the shape of the MFT as it relates to the native proximal scaphoid has not been previously performed. Our study aimed to quantifiably compare the shape of the MFT, proximal scaphoid, and scaphoid fossa. Methods: Using imaging processing software, we measured radius of curvature of the articular segments in MRI scans of 10 healthy subjects’ wrists and knees. Results: Compared with the scaphoid fossa, average ratio of the radius of circumference of the proximal scaphoid was 0.79 and 0.78 in the coronal and sagittal planes, respectively. Compared with the scaphoid fossa, average ratio of the radius of circumference of the MFT was 0.98 and 1.31 in the coronal and sagittal planes, respectively. The radius of curvature of the MFT was larger than the proximal scaphoid, in the coronal and sagittal planes. In the coronal plane, the MFT radius of curvature is nearly identical to the scaphoid fossa, a closer match than the scaphoid itself. In the sagittal plane, the radius of curvature of the MFT was larger than the radius of curvature of the scaphoid fossa. Conclusions: Our data suggest that the radius of curvature, in the sagittal and coronal planes, of the MFT and proximal scaphoid is disparate.

scholarly journals Assessing arterial blood flow and vessel area variations using real-time zonal phase-contrast MRI

2006 ◽  
Vol 23 (3) ◽  
pp. 422-429 ◽  
Author(s):  
Markus Oelhafen ◽  
Juerg Schwitter ◽  
Sebastian Kozerke ◽  
Roger Luechinger ◽  
Peter Boesiger
Keyword(s):  
Blood Flow ◽  
Real Time ◽  
Phase Contrast ◽  
Arterial Blood Flow ◽  
Phase Contrast Mri ◽  
Vessel Area ◽  
Arterial Blood

scholarly journals Magnetic resonance imaging based coracoid morphology and its associations with subscapularis tears: a new index

2017 ◽  
Vol 11 (1_suppl) ◽  
pp. 52-58 ◽  
Author(s):  
Adam C. Watson ◽  
Richard P. Jamieson ◽  
Andrew C. Mattin ◽  
Richard S. Page
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Sagittal Plane ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Resonance Imaging ◽  
Intraclass Correlation Coefficients ◽  
Arm Position ◽  
Magnetic Resonance Imaging Mri

Background We aimed to assess the validity of magnetic resonance imaging (MRI) in assessing the subcorocoid space and determine the validity of novel sagittal plane subcorocoid space measurements. Methods We assessed 33 arthroscopically proven subscapularis tears with MRIs compared to 33 (instability) controls with normal subscapularis tendons. Three examiners analyzed MRIs for seven static indices of corocoid morphology, in axial and sagittal planes. We explored reviewer variation using intraclass correlation coefficients (ICC) and differences between the two groups was explored using t-tests. Results Groups were similar in characteristics but different in age (cases = 53, controls = 23). ICC showed good (2/7) or excellent (5/7) reliability. Small differences(<1.6 mm) were identified between subscapularis tears and controls in coraco–humeral distance, in axial ( p = 0.092) and sagittal planes ( p = 0.045). There were statistically significant differences between groups when analyzing the angular projection of the coracoid from the glenoid, in both sagittal ( p < 0.0001) and axial planes ( p = 0.045). Conclusions Acute inferior angulation of the corocoid in the sagittal plane may be associated with subscapularis tears. Static indices are measured within the scapula and not affected by arm position. MRI reliably provided a platform to assess the coracoid. Based on this, we currently consider corocoplasty in patients with subscapularis tears and a sagittal coroco–glenoid angle <60o to reduce potential impingement.

scholarly journals Aortic Pulse Wave Velocities Using Real-Time Phase-Contrast MRI

2015 ◽  
Vol 9 (1) ◽  
pp. 9-14
Author(s):  
Arun A. Joseph ◽  
Martin Fasshauser ◽  
Klaus-Dietmar Merboldt ◽  
Jens Frahm
Keyword(s):  
Real Time ◽  
Phase Contrast ◽  
Cross Correlation ◽  
Pulse Wave ◽  
Nonlinear Inversion ◽  
Close Correspondence ◽  
Phase Contrast Mri ◽  
Wave Velocities ◽  
Cross Correlation Analysis ◽  
Phase Sensitive

Purpose: To evaluate aortic pulse wave velocities obtained by real-time phase-contrast (PC) MRI in comparison to cine PC MRI. Methods: Real-time PC MRI of eight healthy volunteers employed highly undersampled radial FLASH sequences and phase-sensitive image reconstructions by regularized nonlinear inversion (NLINV) at 40 ms temporal resolution and 1.3 mm in-plane resolution. Pulse wave velocities were analyzed for combinations of 2, 3 and 4 locations of aortic flow using time-to-upslope and cross-correlation methods. Results: For the time-to-upslope analysis mean pulse wave velocities ranged from 3.5 to 3.9 m s-1 for real-time PC MRI and from 3.5 to 3.8 m s-1 for cine PC MRI. A cross-correlation analysis of the same data resulted in 2.9 to 3.3 m s-1 and 3.3 to 3.7 m s-1, respectively. Conclusion: Real-time PC MRI determined aortic pulse wave velocities from single cardiac cycles in close correspondence to values obtained by cine PC MRI.

scholarly journals Velocity vector reconstruction for real‐time phase‐contrast MRI with radial Maxwell correction

2021 ◽  
Author(s):  
Jost M. Kollmeier ◽  
Oleksandr Kalentev ◽  
Jakob Klosowski ◽  
Dirk Voit ◽  
Jens Frahm
Keyword(s):  
Real Time ◽  
Phase Contrast ◽  
Velocity Vector ◽  
Phase Contrast Mri

SU-GG-J-164: Real-Time Magnetic Resonance Imaging (MRI) Guidance and Thermal Modeling to Focus Hyperthermia Delivery

2008 ◽  
Vol 35 (6Part8) ◽  
pp. 2717-2717
Author(s):  
V Stakhursky ◽  
K Cheng ◽  
J MacFall ◽  
P Maccarini ◽  
P Stauffer ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Real Time ◽  
Thermal Modeling ◽  
Resonance Imaging ◽  
Mri Guidance ◽  
Magnetic Resonance Imaging Mri

Basic Neuronavigation Options for Cortical and Subcortical Brain Lesions Surgery

2018 ◽  
Vol 11 (2) ◽  
pp. 141-149
Author(s):  
Milan N. Mladenovski ◽  
Nikolay V. Vasilev ◽  
Mladen E. Ovcharov ◽  
Iliya V. Valkov
Keyword(s):  
Real Time ◽  
Brain Lesions ◽  
Neurosurgical Procedures ◽  
Cortical Lesions ◽  
Resonance Imaging ◽  
Anatomical Structures ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri ◽  
The Brain ◽  
Real Time Ultrasonography

Summary Craniometric points are essential for orienting neurosurgeons in their practice. Understanding the correlations of these points help to manage any pathological lesion located on the cortical surface and subcortically. The brain sulci and gyri should be identified before craniotomy. It is difficult to identify these anatomical structures intraoperatively (after craniotomy) with precision. The main purpose of this study was to collect as much information as possible from the literature and our clinical practice in order to facilitate the placement of craniotomies without using modern neuronavigation systems. Operative reports from the last five years on cranial operations for cortical and subcortical lesions were reviewed. All the craniotomies had been planned, using four methods: detection of craniometric points, computed tomography (CT) scans/topograms, magnetic resonance imaging (MRI) scans/topograms, and intraoperative real-time ultrasonography (USG). Retrospectively, we analyzed 295 cranial operations. Our analysis showed that operating on for cortical lesions, we had frequently used the first and the second method mentioned above (118 patients), while in cases of subcortical lesions, we had used craniometric points, MRI scans/topograms and intraoperative real-time USG as methods of neuronavigation (177 patients). These results show that craniometric points are essential in both neurosurgical procedures.

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