Search Results
Results 501 - 550 of 1314
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Ohshima Hiroshi - - 2008
BACKGROUND/AIMS: Dark circles of the lower eyelid (DCLE) represent a well-known beauty problem. The pathogenesis of DCLE is obscure, although stasis and hyperpigmentation of the eyelids have been considered to be involved. One reason for the small number of studies on DCLE may be the difficulty in measuring such soft ...
Rong Peng P Chemistry Department, New York University, 100 Washington Square East, Room 966, New York, NY 10003-6621, - - 2008
Monitoring the sodium concentration in vivo using 23Na MRI can be an important tool for assessing the onset of tissue disorders. Practical clinical 23Na MRI methods furthermore often do not allow one to use sufficiently small voxel sizes such that only the tissue of interest is seen, but a large ...
Bittersohl B - - 2009
OBJECTIVES: Implementation of an experimental model to compare cartilage MR imaging by means of histological analyses. MATERIAL AND METHODS: MRI was obtained from 4 patients expecting total knee replacement at 1.5 and/or 3T prior surgery. The timeframe between pre-op MRI and knee replacement was within two days. Resected cartilage-bone samples ...
Martí-Bonmatí Luis - - 2008
PURPOSE: To study if the pharmacokinetic parameters derived from dynamic contrast-enhanced magnetic resonance (DCE-MR) images of the patellar cartilage are influenced by the main magnetic field strength. MATERIALS AND METHODS: DCE-MR images of the knee were obtained from 16 normal male subjects (eight cases in each 1.5 and 3T magnets). ...
Schneider E - - 2008
To outline the osteoarthritis initiative's (OAI) magnetic resonance (MR) system quality assurance (QA) processes and present the first 3 years' results. OAI MR QA included acquisitions evaluated manually at each of the four sites and other acquisitions assessed by an automated computer program. Key image characteristics such as signal-to-noise, contrast-to-noise, ...
Peres M A - - 2008
Sloths (Bradypus sp.) are extremely sensitive animals that suffer with the destruction and fragmentation of forests. They present a low population growth rate and need to be further studied for the preservation of the specie. Thus, the aim of this study was to establish an efficient semen collection protocol as ...
Bolbos R I RI Musculoskeletal Quantitative Imaging Research, Department of Radiology, University of California San Francisco, San Francisco, CA 94107, USA. - - 2008
To evaluate trabecular bone structure in relationship with cartilage parameters in distal femur and proximal tibia of the human knee at 3Tesla (3T) using high-resolution magnetic resonance imaging (MRI) with parallel imaging. Sixteen healthy controls and 16 patients with mild osteoarthritis (OA) were studied using a 3T magnetic resonance (MR) ...
Marlovits Stefan - - 2008
Clinical magnetic resonance imaging (MRI) is the method of choice for the non-invasive evaluation of articular cartilage defects and the follow-up of cartilage repair procedures. The use of cartilage-sensitive sequences and a high spatial-resolution technique enables the evaluation of cartilage morphology even in the early stages of disease, as well ...
Smolinski Daniel - - 2008
PURPOSE: This study aimed to assess the ability of the laser scanning confocal arthroscope (LSCA) to evaluate cartilage microstructure, particularly in differentiating stages of human osteoarthritis (OA) as classified by the International Cartilage Repair Society (ICRS) OA grade definitions. METHODS: Ten tibial plateaus from total knee arthroplasty patients were obtained ...
Franceschi Francesco - - 2008
Periarticular osteoid osteoma of the knee is a diagnostic and therapeutic challenge. This article presents a patient with a juxta-articular osteoid osteoma localized in the patella beneath the cartilage joint level and describes a simple and effective technique of arthroscopic computed tomography-guided en-bloc retrograde resection. The association of computed tomography ...
Ersoy A - - 2008
Eleven proximal and ten intermediate partial or complete hominoid phalanges have been recovered from the middle Miocene site of Paşalar in Turkey. Based on species representation at Paşalar, it is likely that most or all of the phalanges belong to Griphopithecus alpani rather than Kenyapithecus kizili, but both species may ...
Welsch Goetz H - - 2008
To prospectively compare cartilage T2 values after microfracture therapy (MFX) and matrix-associated autologous chondrocyte transplantation (MACT) repair procedures. The study had institutional review board approval by the ethics committee of the Medical University of Vienna; informed consent was obtained. Twenty patients who underwent MFX or MACT (10 in each group) ...
Blair-Levy J M - - 2008
OBJECTIVE: This study was undertaken to test the hypothesis that abnormalities of the subchondral bone can result in osteoarthritis (OA). METHODS: We used a knockin model of human osteogenesis imperfecta, the Brittle IV (Brtl) mouse, in which defective type I collagen is expressed in bone. OA in individual mice was ...
Lohscheller Jörg - - 2008
OBJECTIVES: High-speed (HS) video recordings are the up-to-date method for visualizing irregular vocal fold vibrations. However, perceptive evaluation during offline replay is time consuming and shows high inter-rater variability. METHOD: A visualization procedure is presented that extracts vocal fold vibrations from HS videos and transfers the motion information into a ...
Ozturk Ersin E GATA Haydarpasa Egitim, Hastanesi Radiology, Uskudar, Istanbul, Turkey. - - 2008
A 27-year-old male athlete presented with chronic right dorsal midfoot pain and limitation in midfoot movements. Computed tomography and magnetic resonance imaging demonstrated an nondisplaced osteochondral fragment within the proximal articular surface of the tarsal navicular. Imaging findings of this disease are presented and discussed.
Zalewski Tomasz - - 2008
OBJECTIVE: The objective of the study was to evaluate the ability of the noninvasive magnetic resonance techniques to monitor the scaffold-aided process of articular cartilage repair. MATERIALS AND METHODS: Defects of 4 mm in diameter and 3 mm in depth were created in right knees of 30 adolescent white New ...
Kim J W - - 2008
INTRODUCTION: Radiological imaging plays an indispensable, complementary role to endoscopy in the pre-therapeutic assessment of laryngeal cancer. We evaluated the reliability of radiological imaging in determining the extent of cancer and surgical resection, by comparing the results of pre-operative computed tomography and magnetic resonance imaging with those for post-operative pathological ...
Banerjee Suchandrima - - 2008
The purpose of this work was to implement autocalibrating GRAPPA-based parallel imaging (PI) for in vivo high-resolution (HR) MRI of cartilage and trabecular bone micro-architecture at 7T and to evaluate its performance based on comparison of MR-derived morphology metrics between accelerated and conventional images and comparison of geometry factor measures ...
Lohscheller Jörg - - 2008
Endoscopic high-speed laryngoscopy in combination with image analysis strategies is the most promising approach to investigate the interrelation between vocal fold vibrations and voice disorders. So far, due to the lack of an objective and standardized analysis procedure a unique characterization of vocal fold vibrations has not been achieved yet. ...
Jones C W - - 2008
The assessment of cartilage repair has largely been limited to macroscopic observation, magnetic resonance imaging (MRI), or destructive biopsy. The aims of this study were to establish an ovine model of articular cartilage injury repair and to examine the efficacy of nondestructive techniques for assessing cartilage regeneration by matrix-induced autologous ...
Gray Martha L - - 2008
Many new therapeutic strategies have been and are being developed to prevent, correct, or slow the progression of osteoarthritis. Our ability to evaluate the efficacy of these techniques, or to determine the situations for which they might provide the most benefit, critically depends on diagnostic measures that can serve as ...
Li Wei - - 2008
PURPOSE: To validate the accuracy of T1 measurement by three-dimensional Look-Locker method (3D LL) for delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) of human subjects with and without osteoarthritis (OA), as compared with two-dimensional inversion recovery fast spin-echo (2D IR-FSE) technique. MATERIALS AND METHODS: MR sagittal images of the knees were ...
Kessler Markus A - - 2008
BACKGROUND: It is still unclear whether long-distance running has a deleterious effect on joint health; therefore, this study was undertaken to examine the rate of recovery from alterations occurring at the knee joint in marathon runners due to loading. HYPOTHESIS: Tibial, patellar, and meniscal cartilaginous volumes are able to recover ...
Nishimura Takeshi - - 2008
The configuration of the supralaryngeal vocal tract depends on the nonuniform growth of the oral and pharyngeal portion. The human pharynx develops to form a unique configuration, with the epiglottis losing contact with the velum. This configuration develops from the great descent of the larynx relative to the palate, which ...
Domayer S E - - 2008
The aim of our study was to correlate global T2 values of microfracture repair tissue (RT) with clinical outcome in the knee joint. We assessed 24 patients treated with microfracture in the knee joint. Magnetic resonance (MR) examinations were performed on a 3T MR unit, T2 relaxation times were obtained ...
Winalski C S - - 2008
OBJECTIVE: Magnetic resonance (MR) imaging with contrast media has shown promise for articular cartilage assessment. Dendrimer-linked nitroxides, a new family of MR contrast agents targeted to glycosaminoglycan, may improve cartilage evaluation. This study is designed to determine the ability of dendrimer-linked nitroxides to enhance articular cartilage and measure the intra-articular ...
Lotto Marie L - - 2008
PURPOSE: The purpose of this study was to evaluate tissue effect (tissue removal plus underlying cell death) of two chondroplasty techniques: mechanical debridement (MD) using a rotary shaver blade and thermal chondroplasty using radiofrequency energy (RFE). METHODS: Forty-eight human chondromalacic cartilage samples were treated with either MD or RFE. Pre- ...
Sanz Roberto - - 2008
PURPOSE: To study the pharmacokinetic parameters derived from dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) of the patellar cartilage under normal and pathological conditions. MATERIALS AND METHODS: DCE-MRI was obtained in 22 cases. There were 17 patients with degenerative patellar conditions (eight with chondromalacia and nine with osteoarthritis) and five normal ...
Liu Tian T Biomedical Engineering of Cornell University, USA. - - 2008
The k-space unfolding matrix for parallel imaging in MRI was examined and was found to have the structure of block circulant quasi-band, providing a rigorous mathematical justification for the interpolation kernel in the commonly used GRAPPA method. The optimal GRAPPA kernel size and dimension were closely related to sensitivity spectrum.
Anderson Andrew E AE Department of Bioengineering and Scientific Computing and Imaging Institute, University of Utah, 72 S Central Campus Dr, Room 2646, Salt Lake City, UT 84112, - - 2008
To prospectively assess in a phantom the reconstruction errors and detection limits of cartilage thickness measurements obtained with multidetector computed tomographic (CT) arthrography, as a function of contrast agent concentration, scanning direction, spatial resolution, joint spacing, and tube current, with known measurements as the reference standard. A phantom with nine ...
Neu Corey P - - 2008
Articular cartilage is a load bearing and lubricating tissue in animal joints. Heterogeneous deformations arise in the structured and zonal tissue under the application of mechanical load. The character of these deformations is altered by degenerative joint disease. Here, we document an MRI-based technique for determining deformations throughout the volume ...
Koch C - - 2008
The 2-year-old sheep is a frequently used model in spinal orthopaedic research; however, so far no investigations have been performed on physiological tissue of untreated animals. In this study, the cervical spine segment 3/4 of eight 2-year-old female Merino sheep was evaluated histologically and histomorphometrically. Specimens were stained with Masson-Goldner-Trichrome, ...
Efron Nathan - - 2007
PURPOSE: To investigate the effect of observation time on the precision of grading the severity of contact lens complications. METHODS: Twenty-five optometry students used the Efron Grading Scales for Contact Lens Complications to grade the severity of one image of each of the 16 forms of anterior eye pathology depicted ...
Kobayashi Takaaki - - 2008
The purpose of this study was to investigate whether it is possible to successfully accumulate magnetically labeled mesenchymal stem cells (MSCs), under the direction of an external magnetic force, to the desired portion of osteochondral defects of the patellae after intra-articular injection of the MSCs. MSCs were cultured from bone ...
Subhas N - - 2008
We report a case of a 47-year-old man who presented with progressive loss of motion and pain in the right shoulder. Radiographs of the shoulder demonstrated dense ossification in the glenoid and humeral head with extension into the periarticular soft tissues. CT and MRI scans confirmed the radiographic findings and ...
Levashina Julia - - 2007
An Interview Faking Behavior (IFB) scale is developed and validated in 6 studies (N = 1,346). In Study 1, a taxonomy of faking behavior is delineated. The factor structure of a measure is evaluated and refined (Studies 2 and 3). The convergent and discriminant validity of the measure is examined ...
Jonas N E - - 2007
A 9-year-old boy presented to our department 8 days after attempting to insert a non-piercing magnetic ear stud on either side of his nose. He had been unable to remove them, and both magnetic parts of the ear studs were still present in his nose. Examination of the nose was ...
Mok Chung-Wai - - 2007
OBJECTIVE: To investigate the potential use of two-dimensional digital images as an alternative to orthodontic casts in the assessment of malocclusion and orthodontic treatment need. MATERIAL AND METHODS: Assessment of malocclusion (Angle's classification of molars, overjet, and overbite) and orthodontic treatment need (Index of Orthodontic Treatment Need (IOTN): Dental Health ...
Mamisch Tallal Charles - - 2008
OBJECTIVES: To demonstrate the feasibility of time-reversed fast imaging with steady-state precession (FISP) called PSIF for diffusion-weighted imaging of cartilage and cartilage transplants in a clinical study. MATERIAL AND METHODS: In a cross-sectional study 15 patients underwent MRI using a 3D partially balanced steady-state gradient echo pulse sequence with and ...
Boileau C - - 2008
OBJECTIVES: Osteoarthritis (OA) structural changes take place over decades in humans. MRI can provide precise and reliable information on the joint structure and changes over time. In this study, we investigated the reliability of quantitative MRI in assessing knee OA structural changes in the experimental anterior cruciate ligament (ACL) dog ...
Bowers M E ME Department of Orthopaedics, Brown Medical School, Rhode Island Hospital, Providence, RI 02903, - - 2008
To assess the effects of interference screws, which are commonly used to surgically fix an anterior cruciate ligament (ACL) graft in the ACL-deficient knee, and magnetic field strength on cartilage volume and thickness measurements with quantitative magnetic resonance imaging (qMRI). Five cadaver knees were imaged using a cartilage-sensitive sequence (T1-weighted ...
Chang Herng-Hua HH Biomedical Engineering IDP, University of California at Los Angeles, Los Angeles, CA 90095-1721, USA. - - 2008
A new deformable model, the charged fluid model (CFM), that uses the simulation of charged elements was used to segment medical images. Poisson's equation was used to guide the evolution of the CFM in two steps. In the first step, the elements of the charged fluid were distributed along the ...
Jaremko Jacob L - - 2007
PURPOSE: To quantify the accuracy of magnetic resonance imaging (MRI) measurement of change in cartilage volume due to thin linear excisions, simulating arthritic cartilage losses, by comparison with laboratory volume measurements in an ex vivo porcine model. MATERIALS AND METHODS: We scanned 15 porcine patellae by T1-weighted spoiled gradient echo ...
Cheng Yuanzhi - - 2007
Accurate measurement of the distance separating two adjacent sheet structures, such as femoral cartilage and acetabular cartilage in the hip joint is important in evaluation of osteoarthritis. A new method, insensitive to the influence of adjacent sheet structures, was developed to improve the accuracy of hip cartilage thickness measurement. A ...
McErlain D D - - 2008
OBJECTIVE: To non-invasively investigate the changes to epiphyseal bone occurring in a longitudinal pre-clinical model of osteoarthritis (OA) using in vivo micro-computed tomography (micro-CT). DESIGN: In vivo micro-CT images were acquired using a bench-top micro-CT scanner, which produces three-dimensional data with isotropic voxel spacing of 0.046 mm. Male rodents were ...
Heiland Max - - 2007
OBJECTIVE: The aim of this study was to evaluate soft tissue image quality of a mobile cone-beam computed tomography (CBCT) scanner with an integrated flat-panel detector. STUDY DESIGN: Eight fresh human cadavers were used in this study. For evaluation of soft tissue visualization, CBCT data sets and corresponding computed tomography ...
Davies-Tuck M - - 2008
OBJECTIVE: The patellofemoral joint is an example of an incongruent articulation commonly affected by osteoarthritis (OA). The relationship between femoral sulcus angle and the development and progression of patellofemoral OA is unclear. The aim of this study was to examine the relationship between the femoral sulcus angle at baseline and ...
Chu Constance R - - 2007
A series of bench to operating room studies was conducted to determine whether it is feasible to use optical coherence tomography (OCT) clinically to diagnose potentially reversible early cartilage degeneration. A human cadaver study was performed to confirm the reproducibility of OCT imaging and grading based on identification of changes ...
Bittersohl Bernd - - 2007
PURPOSE: To evaluate high-resolution MRI of the triangular fibrocartilage complex (TFCC) at 3T using a surface coil (SC) or volume coil (VC). MATERIALS AND METHODS: MRI was obtained from nine volunteers in the supine position with a 3-inch SC and in prone position with a transmit-receiver wrist VC at 3 ...
Akhtar S - - 2007
OBJECTIVE: We present a multi-dimensional framework for the visualization of femoral articular cartilage. The framework comprises methods for visualizing and quantifying changes in cartilage thickness and surface morphology derived from MRI based cartilage segmentation. Adequate visualization of cartilage allows accurate and clinically meaningful assessment of cartilage surface morphology and thickness. ...
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