IN VIVO EVALUATION OF HIP INSTABILITY USING THREE-DIMENSIONAL MAGNETIC RESONANCE IMAGING

Purpose: The aim of this study was to assess the volumetry of the hippocampus in the Leber’s hereditary optic neuropathy (LHON) of blind patients. Methods: A total of 25 patients with LHON were randomly included into the study from the national health database. A total of 15 patients were selected according to the inclusion criteria. The submillimeter segmentation of the hippocampus was based on three-dimensional spoiled gradient recalled acquisition in steady state (3D-SPGR) BRAVO 7T magnetic resonance imaging (MRI) protocol. Results: Statistical analysis revealed that compared to healthy controls (HC), LHON subjects had multiple significant differences only in the right hippocampus, including a significantly higher volume of hippocampal tail (p = 0.009), subiculum body (p = 0.018), CA1 body (p = 0.002), hippocampal fissure (p = 0.046), molecular layer hippocampus (HP) body (p = 0.014), CA3 body (p = 0.006), Granule Cell (GC) and Molecular Layer (ML) of the Dentate Gyrus (DG)–GC ML DG body (p = 0.003), CA4 body (p = 0.001), whole hippocampal body (p = 0.018), and the whole hippocampus volume (p = 0.023). Discussion: The ultra-high-field magnetic resonance imaging allowed hippocampus quality visualization and analysis, serving as a powerful in vivo diagnostic tool in the diagnostic process and LHON disease course assessment. The study confirmed previous reports regarding volumetry of hippocampus in blind individuals.

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In vivo three-dimensional magnetic resonance imaging of rat knee osteoarthritis model induced using meniscal transection

Journal of Orthopaedic Translation ◽

10.1016/j.jot.2015.06.002 ◽

2015 ◽

Vol 3 (3) ◽

pp. 134-141 ◽

Cited By ~ 2

Author(s):

Yi-Xiang J. Wang ◽

Junqing Wang ◽

Min Deng ◽

Gang Liu ◽

Ling Qin

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Knee Osteoarthritis ◽

Three Dimensional ◽

Resonance Imaging

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In Vivo Tracking of the Human Patella Using Cine Phase Contrast Magnetic Resonance Imaging

Journal of Biomechanical Engineering ◽

10.1115/1.2800868 ◽

1999 ◽

Vol 121 (6) ◽

pp. 650-656 ◽

Cited By ~ 86

Author(s):

F. T. Sheehan ◽

F. E. Zajac ◽

J. E. Drace

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Knee Joint ◽

Phase Contrast ◽

Three Dimensional ◽

Resonance Imaging ◽

Contrast Magnetic Resonance ◽

Knee Joint Kinematics ◽

Cine Phase Contrast

Improper patellar tracking is often considered to be the cause of patellar-femoral pain. Unfortunately, our knowledge of patellar-femoral-tibial (knee) joint kinematics is severely limited due to a lack of three-dimensional, noninvasive, in vivo measurement techniques. This study presents the first large-scale, dynamic, three-dimensional, noninvasive, in vivo study of nonimpaired knee joint kinematics during volitional leg extensions. Cine-phase contrast magnetic resonance imaging was used to measure the velocity profiles of the patella, femur, and tibia in 18 unimpaired knees during leg extensions, resisted by a 34 N weight. Bone displacements were calculated through integration and then converted into three-dimensional orientation angles. We found that the patella displaced laterally, superiorly, and anteriorly as the knee extended. Further, patellar flexion lagged knee flexion, patellar tilt was variable, and patellar rotation was fairly constant throughout extension.

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In Vitro and In Vivo Evaluation of a Magnetic Resonance Imaging–guided Focused Ultrasound System for Dissolving Clots in Combination with Thrombolytic Drugs

Journal of Stroke and Cerebrovascular Diseases ◽

10.1016/j.jstrokecerebrovasdis.2014.01.028 ◽

2014 ◽

Vol 23 (7) ◽

pp. 1956-1964 ◽

Cited By ~ 3

Author(s):

Christakis Damianou ◽

Venediktos Hadjisavvas ◽

Kleanthis Ioannides

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Focused Ultrasound ◽

Resonance Imaging ◽

In Vivo Evaluation ◽

Ultrasound System

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A Cadaveric and Magnetic Resonance Imaging Investigation of the Salpingopharyngeus

Journal of Speech Language and Hearing Research ◽

10.1044/2021_jslhr-20-00483 ◽

2021 ◽

pp. 1-11

Author(s):

Karen Perta ◽

Eileen Kalmar ◽

Youkyung Bae

Keyword(s):

Magnetic Resonance Imaging ◽

Body Weight ◽

Magnetic Resonance ◽

Three Dimensional ◽

Hierarchical Regression ◽

Resonance Imaging ◽

Before And After ◽

Velopharyngeal Function ◽

The Relationship

Purpose The aim of the study was to update our information regarding the salpingopharyngeus (SP) muscle using cadaveric and in vivo magnetic resonance imaging (MRI) data. Primary objectives were to (a) observe the presence/absence of the muscle and (b) quantify and describe its dimensions and course. Method SP specimens from 19 cadavers (10 women, nine men) were analyzed. Following head bisection, measurements of SP, including width of the cartilaginous attachment (CW) and width of the superior muscle base (SMW), were taken before and after removal of the overlying mucosa. In addition, SP was analyzed in 15 healthy subjects (eight men, seven women) using high-resolution three-dimensional MRI data. CW and SMW measures were replicated in the paraxial MRI view. Results The presence of the salpingopharyngeal fold and muscle was confirmed bilaterally in all cadaveric and living subjects. Following mucosa removal, mean cadaveric CW and SMW measurements were 5.6 and 3.8 mm, respectively. Mean in vivo CW and SMW were 6.1 and 3.7 mm, respectively. Results from the hierarchical regression analyses revealed that, in both cadaveric and living groups, SMW is dependent on the relationship between age and body weight, after controlling for sex. Conclusions The salpingopharyngeal fold and SP muscle are always present bilaterally and can be quantified at the superior origin using both cadaveric and in vivo three-dimensional MRI data. Though both the superior origin and inferior course of SP are highly variable, the size of the SP muscle is dependent on characteristics known to affect muscle fibers, such as the relationship between age and body weight. Given the consistent and quantifiable presence of the SP muscle, its potential role in velopharyngeal function for speech and swallowing is reconsidered. Supplemental Material https://doi.org/10.23641/asha.14347859

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In vivo evaluation of cortical thickness with magnetic resonance imaging in patients with bipolar disorder

Psicologia Teoria e Pesquisa ◽

10.1590/s1983-32882009000200010 ◽

2009 ◽

Vol 2 (2) ◽

Author(s):

Thomas Martin Doring ◽

Tadeu Takao Almodovar Kubo ◽

Juliana Rodrigues Doring ◽

Jiosef Fainberg ◽

Mario Juruena ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Bipolar Disorder ◽

Magnetic Resonance ◽

Cortical Thickness ◽

Resonance Imaging ◽

In Vivo Evaluation

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ECG-gated dynamic magnetic resonance imaging method for examination of the pig heart

Acta Veterinaria Hungarica ◽

10.1556/004.49.2001.3.3 ◽

2001 ◽

Vol 49 (3) ◽

pp. 275-284

Author(s):

Zs. Petrási ◽

R. Romvári ◽

G. Bajzik ◽

B. Fenyves ◽

I. Repa ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Three Dimensional ◽

Dynamic Magnetic Resonance Imaging ◽

Imaging Method ◽

Resonance Imaging ◽

Dynamic Magnetic Resonance ◽

Heart Cycle ◽

The Right

A dynamic magnetic resonance imaging (MRI) method was developed for in vivo examination of the pig heart. Measurements were carried out on 15 meat-type pigs of different liveweight using a 1.5 T equipment. Inhalation anaesthesia was applied, then data acquisition was synchronised by ECG gating. Depending on the heart rate and heart size, in each case 8 to 10 slices and in each slice 8 to 14 phases were acquired prospectively according to one heart cycle. During the post-processing of the images the left and the right ventricular volumes were determined. The values measured at 106 kg liveweight are 2.5 times higher than those obtained at 22 kg, while the ejection fractions are equal. The calculated cardiac output values were 3.5 l (22 kg, 132 beats/min.), and 6.0 l (106 kg, 91 beats/min.), respectively. After measuring the wall thickness, the contraction values were also determined for the septum (70%), and for the anterior (61%), posterior (41%) and lateral (54%) walls of the left ventricle. Three-dimensional animated models of the ventricles were constructed. Based on the investigations performed, the preconditioning, the anaesthetic procedure, the specific details of ECG measurement and the correct MR imaging technique were worked out.

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