atherosclerotic plaque imaging techniques in magnetic resonance images
Segmentation of the colon in magnetic resonance images
Ngày tải lên :
16/10/2015, 15:38
... surprising Indeed, segmentation in MR images in general is much more challenging than segmentation in CT images (due to the noise and the inhomogeneity of the images) Segmentation of other organs in ... residues pockets in a pocket tree Then, they combine several algorithms including thresholding/region growing, fuzzy-connectedness, and level-set Thresholding/region growing is used as an initialization ... further since our main interest is in the segmentation in MR images 2.4 Segmentation in MR images Compared to CT colonography, only a few papers have focused on the segmentation process in MR colonography...
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Level set segmentation of brain tumors in magnetic resonance images
Ngày tải lên :
08/11/2015, 17:33
... result in good classification using a small training set, and the result depends on the training set To address this problem, the SVM training is iteratively refined as the level set grows • Defining ... method using three metrics 123 xvi Chapter Introduction 1.1 Motivation Magnetic resonance imaging (MRI) of the brain is often used in tumor diagnosis, monitoring tumor ... nuclear magnetic resonance (NMR), in which magnetic fields and radio waves cause atoms to give off tiny radio signals This imaging medium has been of particular relevance for producing images...
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Báo cáo hóa học: " Adenoviruses with an avb integrin targeting moiety in the fiber shaft or the HI-loop increase tumor specificity without compromising antitumor efficacy in magnetic resonance imaging of colorectal cancer metastases" pdf
Ngày tải lên :
18/06/2014, 16:20
... Adenoviruses with an avb integrin targeting moiety in the fiber shaft or the HI-loop increase tumor specificity without compromising antitumor efficacy in magnetic resonance imaging of colorectal cancer ... wet in iodine-polividone solution (Betadine®; Leiras, Helsinki, Finland) in order to remove extravasated cells and ensure hemostasis The peritoneum and skin were closed in a single layer using ... Replicating viruses WT -Replicating wild type virus WT-RGD -RGD insertion in HI loop of fiber knob for avb integrin targeting [43] WT-RGDK -Fiber shaft’s KKTK domain mutated to RGDK for avb integrin...
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Báo cáo hóa học: " Carbon-coated iron oxide nanoparticles as contrast agents in magnetic resonance imaging" potx
Ngày tải lên :
20/06/2014, 23:20
... agents in magnetic resonance imaging [MRI] [10-13] The carbon coating provides an effective oxidation barrier and prevents corrosion in magnetic core materials Hydrophilic carbon coating on iron ... the MR images is shown in Figure In MRI, the signal recorded during the scan is related to the magnetic relaxation processes of the nuclear spins of the protons in the water molecules in the ... and T2 contrast agents in MRI Abbreviations DLS, dynamic light scattering; FTIR, Fourier transform infrared; ICP, inductively coupled plasma; MRI, magnetic resonance imaging; TEM, transmission...
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Segmentation of human muscles of mastication from magnetic resonance images
Ngày tải lên :
12/09/2015, 08:20
... used in pre-surgical planning as well as for navigation purposes during surgery [35 – 37] MR imaging is increasingly being used in clinical treatment for dental patients For example, MR imaging ... quality [57] Other examples of thresholding being instrumental in medical imaging include a local thresholding algorithm that determines 32 marrow intensity value in the neighborhood of each voxel ... used in the evaluation of patients with occult submucous cleft palate and information obtained was used to aid in the treatment decision [38] In another example, MR imaging was used in the clinical...
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Brain tumor detection from 3d magnetic resonance images
Ngày tải lên :
02/10/2015, 12:55
... object contours can be delineated through finding out the minimal paths instead of minimizing the energy E directly It can be shown that in order to minimize Equation 2.15, the initial curve should ... There might be intensity discontinuities in the images that results in noise and gaps in the vessels • Low intensity contrast between small vessels and their background: Due to MRA imaging properties, ... consuming In addition, the manually obtained results are not reproducible With the fast increasing size and number of medical images, the use of computers in facilitating their processing and...
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Fast registration of contrast enhanced magnetic resonance images of the breast
Ngày tải lên :
06/10/2015, 20:49
... contrast injection “Wash -in refers to the initial contrast enhancement phase, while “wash-out” is normally only seen in the usual clinical imaging Chapter Introduction timeframe of about 10 minutes ... achieve complex rendering effects Due to the programmability and floating point support available on GPUs, there has been an increasing interest in utilizing it for scientific computing GPUs employ ... used trilinear interpolation instead of cubic B-spline to compute the displacement of voxels Chapter A Framework for Registration Using GPUs 37 from the control points By using trilinear interpolation,...
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báo cáo hóa học:" Dynamic magnetic resonance imaging in assessing lung function in adolescent idiopathic scoliosis: a pilot study of comparison before and after posterior spinal fusion" doc
Ngày tải lên :
20/06/2014, 01:20
... idiopathic scoliosis using dynamic breathing MRI Spine 2004, 29(3):298-302 Chu WC, Li AM, Ng BK, Chan DF, Lam TP, Lam WW, Cheng JC: Dynamic magnetic resonance imaging in assessing lung volumes, chest ... to feeling of breathlessness during exercise activities in ascending order of severity Score 7–9 was equivalent to feeling of breathlessness at gentle exertion such as walking in ascending order ... neurologically normal on detail clinical examination Exclusion criteria included history of back injury, weakness or numbness in one or more limbs, urinary incontinence or nocturnal enuresis None...
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Báo cáo y học: "Functional magnetic resonance imaging (fMRI) of attention processes in presumed obligate carriers of schizophrenia: preliminary findings" ppsx
Ngày tải lên :
08/08/2014, 23:21
... anatomy while maintaining any geometric distortion inherent within the echo-planar imaging (EPI) methodology Because slight subject motion during image acquisition can cause changes in T2-weighted ... periods of sustained attention In the POCs, significantly increased activity was found in the following regions during sustained attention trials compared to rest (listed in descending order of ... side of the images In the POCs, dual attention (vs rest) was associated with increased BOLD activity in the following (listed in descending order of size): bilateral cingulate gyri, R inferior occipital...
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Báo cáo y học: "Dynamic magnetic resonance of the wrist in psoriatic arthritis reveals imaging patterns similar to those of rheumatoid arthritis" pps
Ngày tải lên :
09/08/2014, 06:22
... was examined In patients with equal involvement of the wrists, and in normal controls, the right wrist was examined Patients and controls were instructed to avoid intense activity involving the ... Cimmino MA, Innocenti S, Livrone F, Magnaguagno F, Silvestri E, Garlaschi G: Dynamic gadolinium-enhanced magnetic resonance imaging of the wrist in patients with rheumatoid arthritis can discriminate ... between indexes of severity and dynamic MRI in either PsA and RA This last finding is surprising in view of our previous results on the high correlation between clinical and laboratory indexes...
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Báo cáo y học: "Magnetic resonance imaging changes of sacroiliac joints in patients with recent-onset inflammatory back pain: inter-reader reliability and prevalence of abnormalities" potx
Ngày tải lên :
09/08/2014, 07:20
... to the inflammatory and structural findings Readers agreed on the presence of inflammation at any site in 85% of the cases in the right SI joint, and in 78% of the cases in the left SI joint Kappa ... reflecting the agreement for detecting inflammation were reasonable (right SI joint, 0.68; left SI joint, 0.51) Table also provides insight into the prevalence of the various findings in this ... of interest in an ongoing ASAS-OMERACT working group [13] Conclusion 10 MRI can reliably detect inflammation and structural changes in SI joints in patients with early inflammatory back pain...
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Báo cáo y học: "proximal interphalangeal joints in rheumatoid arthritis: a comparison with magnetic resonance imaging, conventional radiography and clinical examination" pdf
Ngày tải lên :
09/08/2014, 07:20
... the MRI finding of erosions in the finger joints is that Table Signs of inflammation on ultrasonography versus clinical joint assessment in finger joints Signs of inflammation US + clinical assessment ... MRI, magnetic resonance imaging; US, ultrasonography MRI did not permit visualization of joint effusion in RA finger joints, probably because of the minimal amount of fluid in the examined joints, ... plain film radiography in assessing bone destruction in the examined joints, and had equal specificity B-mode ultrasonography was more sensitive than clinical examination in assessing signs of inflammation,...
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Báo cáo y học: "Magnetic resonance imaging in psoriatic arthritis: a review of the literature" pdf
Ngày tải lên :
09/08/2014, 07:20
... patients (including four with PsA), and similar findings were described, again often including underlying bone marrow oedema [15] However, Jevtic and coworkers [12], describing magnetic resonance ... Clin Exp Rheumatol 2001, 19:291-296 Cimmino MA, Parodi M, Innocenti S, Succio G, Banderali S, Silvestri E, Garlaschi G: Dynamic magnetic resonance imaging in psoriatic arthritis reveals imaging ... (Gd-DTPA) magnetic resonance imaging Skeletal Radiol 1995, 24:351-355 Maillefert JF, Dardel P, Cherasse A, Mistrih R, Krause D, Tavernier: Magnetic resonance imaging in the assessment of synovial inflammation...
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Báo cáo y học: "Are bone erosions detected by magnetic resonance imaging and ultrasonography true erosions? A comparison with computed tomography in rheumatoid arthritis metacarpophalangeal joints" pptx
Ngày tải lên :
09/08/2014, 08:22
... studies in evaluating magnetic resonance images of RA finger joints Prior to the evaluation, it was decided that the scoring by MØ would be used for comparison with results of the other imaging modalities ... (Figures and 2) Magnetic resonance images were evaluated by a rheumatologist (BJE) with experience from previous studies in evaluating magnetic resonance images of RA finger joints Statistical ... seen on US in all healthy control individuals (eight quadrants in three MCP joints in one person, and in one quadrant each in the remaining three persons) The concordance between readings by the...
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Báo cáo y học: "Correlation of histopathological findings and magnetic resonance imaging in the spine of patients with ankylosing spondylitis" potx
Ngày tải lên :
09/08/2014, 08:22
... Negative correlation of bone marrow edema in histopathological assessment and magnetic resonance imaging (a) Magnetic resonance imaging of imaging zygapophyseal joints (cyan arrows) without detectable ... marrow edema in histopathological assessment and magnetic resonance imaging (a) Magnetic resonance imaging (T2 imaging sequence) of a zygapophyseal joint with bone marrow edema (cyan arrow) (asterisk, ... thoracic spine was analyzed for increased signals in T2-weighted sequences Table Correlation of histopathological findings and magnetic resonance imaging Patient no HLA-B27 Edema (%) Cellular infiltration...
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Báo cáo y học: "Functional magnetic resonance imaging findings in fibromyalgia" potx
Ngày tải lên :
09/08/2014, 08:23
... These findings suggest that pain catastrophizing exerts influence on pain processing that is independent of the influence of depression and supports the hypothesis that catastrophizing influences ... brain regions that may be involved in this augmentation Advances in design and new imaging technologies promise to further increase our understanding of the mechanisms that initiate and maintain ... brain imaging in FM has revealed the following insights First, FM patients differ from healthy controls in baseline levels of neural activity, specifically in the caudate nucleus Second, administration...
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Báo cáo y học: "Risk factors associated with the loss of cartilage volume on weight-bearing areas in knee osteoarthritis patients assessed by quantitative magnetic resonance imaging: a longitudinal study" pot
Ngày tải lên :
09/08/2014, 10:20
... symptoms, including worsening of pain at 24 months Competing interests JFB, GAC, and JMM declare that they have financial competing interests as employees of and/or holders of stocks and/or options in ... patients to be included in a clinical trial It also raises the important issue of the relevance of performing patient stratification at baseline during clinical trials Our findings on the key ... Niu J, Goggins J, Amin S, LaValley MP, Guermazi A, Genant H, Gale D, Felson DT: Increase in bone marrow lesions associated with cartilage loss: a longitudinal magnetic resonance imaging study...
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Báo cáo y học: "Cartilage markers and their association with cartilage loss on magnetic resonance imaging in knee osteoarthritis: the Boston Osteoarthritis Knee Study" doc
Ngày tải lên :
09/08/2014, 10:21
... overarching aim of this investigation was to conduct a study within an existing longitudinal dataset of knee OA with serial knee magnetic resonance imaging (MRI) to evaluate and validate promising ... Veterans Administration Boston Health Care System approved the baseline and follow-up examinations, and informed consent was obtained from all participants Magnetic resonance imaging All studies ... using a phased-array knee coil A positioning device was used to ensure uniformity of positioning among patients The imaging protocol included sagittal spin-echo proton density- and T2weighted images...
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Báo cáo y học: "Ultrasonography, magnetic resonance imaging, radiography, and clinical assessment of inflammatory and destructive changes in fingers and toes of patients with psoriatic arthritis" pot
Ngày tải lên :
09/08/2014, 10:21
... radiologist experienced in musculoskeletal radiography (MH), who was blinded to clinical and other imaging findings Magnetic resonance imaging parameters The acquired images included a coronal T1-weighted ... is a tool increasingly used by clinicians, including rheumatologists, but the US data on small joints in PsA are very limited [8,9]; in particular, the validation of the findings is minimal The ... Ratingen scoring system [11] by an experienced musculoskeletal radiologist (AV) blinded to clinical and other imaging findings Clinical examination All 25 persons underwent clinical examination prior...
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