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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
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Recent article
Artifacts
Abstract
Recent studies suggest that magnetic resonance (MR) imaging of the brain and spine may safely be performed in patients with pacemakers (PMs) and implantable cardioverter/defibrillators (ICDs), when taking adequate precautions. The aim of this study was to investigate safety, feasibility, and diagnost...
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PMID: 21641356
PDF is available here.
PDF is available here.
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Abstract
To evaluate the magnetic susceptibility artifacts associated with different frequency-encoding gradient directions for an angled cephalomedullary device of the proximal femur, and to determine the optimal extremity positioning for reducing artifacts using 0.4 T open MR imaging.
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PMID: 21761778
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
To introduce a correction for speed of sound (SOS) aberrations in three dimensional (3D) ultrasound (US) imaging systems for small but systematic positioning errors in image guided radiotherapy (IGRT) applications. US waves travel at different speeds in different human tissues. Conve...
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PMID: 21776803
PDF is available here.
PDF is available here.
Abstract
The aim of this study was to illustrate the influence of digital filters on the signal-to-noise ratio (SNR) and modulation transfer function (MTF) of digital images. The article will address image pre-processing that may be beneficial for the production of clinically useful digital radiographs with l...
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PMID: 21493878
PDF is available here.
PDF is available here.
Abstract
The results show that the proposed method allows measurement and correction of the geometric distortions in EPI with high accuracy, and reduction of residual blurring. In addition, this method prevents errors in the shift map induced by PSF-ghost artifacts. CONCLUSION: More precise mapping and corre...
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PMID: 21509590
PDF is available here.
PDF is available here.
Abstract
Abstract
This paper addresses depth discrimination of a water column target from bottom clutter discretes in wideband active sonar. To facilitate classification, the waveguide invariant property is used to derive multiple snapshots by uniformly sub-sampling the short-time Fourier transform (STFT) coefficients...
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PMID: 21476638
PDF is available here.
PDF is available here.
Abstract
Successful ultrasonic guided wave detection of flaws at support locations relies on the ability to distinguish between the reflection produced by a simple support on an undamaged pipe and the reflection produced by pipe flaws. Consequently, it is essential to know how the reflections produced by simp...
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PMID: 21476643
PDF is available here.
PDF is available here.
Abstract
Abstract
This paper develops a sequential trans-dimensional Monte Carlo algorithm for geoacoustic inversion in a strongly range-dependent environment. The algorithm applies advanced Markov chain Monte Carlo methods in combination with sequential techniques (particle filters) to carry out geoacoustic inversion...
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PMID: 21476636
PDF is available here.
PDF is available here.
Abstract
Abstract
We have combined classical flow cytometry and a new quantitative flow imaging technique with the ImageStream(®) analyzer. We show that CD36 ligation induces activation of platelets with CD62 expression and their adhesion on leukocytes due to CD62 and CD162 interactions. Preincubation of whole blood...
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PMID: 21462306
PDF is available here.
PDF is available here.
Abstract
Abstract
The application of computer-aided detection (CAD) is expected to improve reader sensitivity and to reduce inter-observer variance in computed tomographic (CT) colonography. However, current CAD systems display a large number of false-positive (FP) detections. The reviewing of a large number of FP CAD...
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PMID: 20473667
PDF is available here.
PDF is available here.
Medical Physics (38)4 2011
Abstract
The PEM Flex Solo II (Naviscan, Inc., San Diego, CA) is currently the only commercially available positron emission mammography (PEM) scanner. This scanner does not apply corrections for count rate effects, attenuation, or scatter during image reconstruction, potentially affecting the quantitative ac...
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PMID: 21626946
PDF is available here.
PDF is available here.
Ultrasonic Imaging (33)2 2011
Abstract
The data-transfer and computation requirements are compared between software-based beamforming using a phased array (PA) and a synthetic transmit aperture (STA). The advantages of a software-based architecture are reduced system complexity and lower hardware cost. Although this architecture can be im...
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PMID: 21710826
PDF is available here.
PDF is available here.
Abstract
Abstract
A new, sample independent optimization criterion for minimizing the effect of the imaging gradients, including the directional awareness they create, is defined for diffusion tensor imaging (DTI) experiments. The DTI linear algebraic framework is expanded to a normed space to design...
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PMID: 21356610
PDF is available here.
PDF is available here.
Abstract
Electrocardiogram-gated multidetector-row computed tomography (MDCT) imaging may aid in the evaluation of prosthetic valve dysfunction. A pulsatile in vitro model was developed to study the MDCT imaging characteristics of mechanical heart valves (MHVs).
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PMID: 21560825
PDF is available here.
PDF is available here.
Medical Physics (38)3 2011
Abstract
Optoacoustic imaging is an emerging noninvasive imaging modality that can resolve optical contrast through several millimeters to centimeters of tissue with diffraction-limited resolution of ultrasound. Yet, quantified reconstruction of tissue absorption maps requires optoacoustic signals to be colle...
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PMID: 21520882
PDF is available here.
PDF is available here.
Medical Physics (38)3 2011
Abstract
At 1.5 T, real-time MRI of joint movement has been shown to be feasible. However, 7 T, provides higher SNR and thus an improved potential for parallel imaging acceleration. The purpose of this work was to build an open, U-shaped eight-channel transmit/receive microstrip coil for 7 T MRI to enable hig...
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PMID: 21520828
PDF is available here.
PDF is available here.
Abstract
Ultrasonic elastography is an imaging technique providing information about the relative stiffness of biological tissues. In general, elastography suffers from noise artifacts, which degrade lesion detectability and increase the likelihood of misdiagnosis. This paper proposes a metho...
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PMID: 21429843
PDF is available here.
PDF is available here.
Abstract
We aimed to identify common mistakes made when radiographing yearling sale horses. Radiographic examinations from repositories at eight yearling sales held in Australia in 2003 were assessed by one of four veterinary radiology specialists. Each radiographic examination consisted of a maximum of 34 ra...
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PMID: 21342306
PDF is available here.
PDF is available here.
Abstract
We analyzed the radiation dose and image quality from TRO CTA performed at a single outpatient center, comparing the scans from a period during which helical scanning with electrocardiographically controlled tube current modulation was used for all patients (n = 35) and after adoption of a strategy...
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PMID: 21306693
PDF is available here.
PDF is available here.
Abstract
We investigated the utility of a visual discrimination model (VDM) and other distortion metrics for predicting JPEG 2000 bit rates corresponding to visually lossless compression of virtual slides for breast biopsy specimens. Threshold bit rates were determined experimentally with human observers for...
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PMID: 20875970
PDF is available here.
PDF is available here.
Abstract
A method is presented to reduce artefacts produced in optoacoustic tomography images due to internal reflection or scattering of the acoustic waves. It is based on weighting the tomographic contribution of each detector with the probability that a signal affected by acoustic mismatches is measured at...
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PMID: 20876007
PDF is available here.
PDF is available here.
Abstract
We propose a learning-based algorithm for automatic medical image annotation based on robust aggregation of learned local appearance cues, achieving high accuracy and robustness against severe diseases, imaging artifacts, occlusion, or missing data. The algorithm starts with a number of landmark det...
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PMID: 20876012
PDF is available here.
PDF is available here.
Abstract
Abstract
MSDE preparation is a technique for black-blood imaging. Our purpose was to evaluate the usefulness of a 3D TSE sequence with MSDE preparation in detecting brain metastases by comparing it with conventional sequences.
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PMID: 21292797
PDF is available here.
PDF is available here.
Abstract
The clinical applicability of high-intensity focused ultrasound (HIFU) for noninvasive therapy is today hampered by the lack of robust and real-time monitoring of tissue damage during treatment. The goal of this study is to show that the estimation of local tissue elasticity from she...
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PMID: 21342822
PDF is available here.
PDF is available here.
Abstract
A post-processing adjustment technique to enhance dual-frequency second-order ultrasound field (SURF) reverberation-noise suppression imaging in medical ultrasound is analyzed. Two variant methods are investigated through numerical simulations. They both solely involve post-processin...
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PMID: 21342819
PDF is available here.
PDF is available here.
Abstract
We used an algebraic Helmholtz inversion (AHI) technique to solve for the complex shear modulus from simulated and experimental velocity data acquired in 2-D and 3-D. Although 3-D velocity estimates are required in general, there are object geometries for which 2-D inversions provide accurate estima...
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PMID: 21342824
PDF is available here.
PDF is available here.
Abstract
We have developed a wafer-level packaging solution for surface acoustic wave devices using imprinted dry film resist (DFR). The packaging process involves the preparation of an imprinted dry film resist that is aligned and laminated to the device wafer and requires one additional lithography step to...
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PMID: 21342826
PDF is available here.
PDF is available here.
Abstract
All occluders were positioned within the LAA. The ACP occluder presented the most extensive artifact size. Visual assessment revealed a residual perfusion of the LAA apex in 4 cases using first-pass perfusion and 3D-TurboFLASH indicating a suboptimal LAA occlusion. By assessing signal-to-time-curves...
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PMID: 21726450
PDF is available here.
PDF is available here.
Abstract
Black blood T2* CMR has superior reproducibility and reduced imaging artefacts for the assessment of cardiac iron, in comparison with the conventional white blood technique, which make it the preferred technique for clinical practice....
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PMID: 21401929
PDF is available here.
PDF is available here.
Abstract
Truncated projections can arise from a detector with a limited field of view (LFOV). Truncation artifacts can be reduced through extrapolation methods; however the reconstructed images with extrapolation are often over-corrected or under-corrected. Recently, an iterative reconstruction-reprojection a...
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PMID: 21422590
PDF is available here.
PDF is available here.
Abstract
Various types of advanced imaging technologies have significantly improved the quality of medical care available to patients. Corresponding medical image reconstruction algorithms, especially 3D reconstruction, play an important role in disease diagnosis and treatment assessment. However, these incre...
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PMID: 21422592
PDF is available here.
PDF is available here.
Abstract
In flat-panel detector-based cone beam CT breast imaging (CBCTBI) systems, scattering is an important factor that degrades image quality. It is not practical to measure the scattering profiles of a breast for all view angles in a patient study, but it is possible to develop a method to estimate the s...
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PMID: 21422591
PDF is available here.
PDF is available here.
Abstract
Total laparoscopic hysterectomy (LH) is a minimally invasive technique, which results in comparable morbidity and better cosmesis compared with total abdominal hysterectomy. The literature is discrepant as to whether it is associated with a higher incidence of positive peritoneal cytology compared w...
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PMID: 21164295
PDF is available here.
PDF is available here.
Abstract
Electromyography (EMG) of the pelvic floor muscles is a valuable but challenging component of urodynamics testing. Optimal assessment relies on thoughtful selection of needle, wire, or surface patch electrodes; consistent display of EMG tracings simultaneously with pressure and flow tracings; and min...
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PMID: 21542442
PDF is available here.
PDF is available here.
Veterinary Radiology & Ultrasound (52)1 Suppl 1 2011
Abstract
Low-field (LF) (0.2-0.4T) magnetic resonance (MR) imaging predominates in veterinary practice. Advantages of LF MR include reduced costs, better patient access, and greater safety. High quality examinations can be achieved using appropriate protocols and investing more scanning time than with high-fi...
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PMID: 21392156
PDF is available here.
PDF is available here.
Abstract
Immunohistochemical techniques detect antigens in tissue sections by means of immunological and chemical reactions. This technique is highly sensitive and specific and can detect a wide variety of antigens in multiple animal species. This chapter reviews common immunohistochemical methods used in th...
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PMID: 20972748
PDF is available here.
PDF is available here.
Abstract
The two-dimensional multi-echo recombined gradient echo (MERGE) technique automatically acquires and sums multiple gradient echoes at various echo times in cervical spine magnetic resonance (MR) imaging. This technique increases the grey-white matter contrast within the spinal cord and should also im...
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PMID: 21528632
PDF is available here.
PDF is available here.
Abstract
In this paper, a detailed description and comparison of speckle reduction of medical ultrasound, and in particular echocardiography, is presented. Fifteen speckle reduction filters are described in a detailed fashion to facilitate implementation for research and evaluation. The filte...
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PMID: 21244977
PDF is available here.
PDF is available here.
Abstract
We present an image-based approach for cardiac phase retrieval from coronary IVUS sequences without an ECG signal. A signal reflecting cardiac motion is computed by exploring the image intensity local mean evolution. The signal is filtered by a band-pass filter centered at the main cardiac frequency...
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PMID: 21244975
PDF is available here.
PDF is available here.
Abstract
Autolytic rupture of the stomach, so called gastromalacia, is a well recognized artifact at autopsy. A 50 year old Asian woman with a past history of alcoholism, head injury and posttraumatic epilepsy was found deceased at home following a 12 h period of feeling unwell, seizures and vomiting. Post...
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PMID: 20467840
PDF is available here.
PDF is available here.
Abstract
Results from toxicological analyses in death investigations are used to determine whether foreign substances were a cause of death, whether they contributed to death, or whether they caused impairment. Drug concentrations are likely to change during pre-terminal stages due to altered pharmacokinetic...
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PMID: 20204545
PDF is available here.
PDF is available here.
Medical Image Analysis (14)6 2010
Abstract
In Magnetic Resonance Imaging, image resolution is limited by several factors such as hardware or time constraints. In many cases, the acquired images have to be upsampled to match a specific resolution. In such cases, image interpolation techniques have been traditionally applied. However, traditio...
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PMID: 20566298
PDF is available here.
PDF is available here.
Abstract
We deduce a projection correlation (PC) to utilize the redundancy (over-determined information) in neighbouring CB views. PC indicates that the main high-frequency information is contained in neighbouring angular projections, instead of the current projection itself, which provides a guiding princip...
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PMID: 20938067
PDF is available here.
PDF is available here.
Abstract
Quantitative ultrasonic characterization of cancellous bone can be complicated by artifacts introduced by analyzing acquired data consisting of two propagating waves (a fast wave and a slow wave) as if only one wave were present. Recovering the ultrasonic properties of overlapping fast and slow waves...
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PMID: 21110589
PDF is available here.
PDF is available here.
Abstract
Ocular artifacts are the most important form of interference in electroencephalogram (EEG) signals. An adaptive filter based on reference signals from an electrooculogram (EOG) can reduce ocular interference, but collecting EOG signals during a long-term EEG recording is inconvenient and uncomfortab...
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PMID: 20532631
PDF is available here.
PDF is available here.
Abstract
Magnetic resonance imaging (MRI) with a continuously moving table (CMT) represents a novel method allowing for the seamless acquisition of an extended field-of-view in the z-direction. One option to realize CMT MRI from a technical point of view is based on very fast sequences like echo planar imagi...
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PMID: 20922644
PDF is available here.
PDF is available here.
Abstract
Medical Physics (37)11 2010
Abstract
The purpose of this study is to develop a single-shot version of the grating-based phase contrast x-ray imaging method and demonstrate its capability of in vivo animal imaging. Here, the authors describe the principle and experimental results. They show the source of artifacts in the phase contrast s...
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PMID: 21158316
PDF is available here.
PDF is available here.
Medical Physics (37)11 2010
Abstract
To develop a binary image reconstruction method for the autolocalization of metallic object(s) in CT with sparse projections.
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PMID: 21158299
PDF is available here.
PDF is available here.
Abstract
We addressed the question whether non-verbal communicative demonstration of the functional use of artifacts makes young infants represent such objects in terms of their kinds. When two different functions were sequentially demonstrated on two novel objects as they emerged one-by-one from behind a sc...
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PMID: 20605019
PDF is available here.
PDF is available here.
Abstract
Ultrasound physics and instrumentation are the foundations of clinical ultrasound. The key physical principle is the piezoelectric effect. When stimulated by an electric current, certain crystals vibrate and produce ultrasound. A hand-held transducer converts electricity into ultrasound, transmits i...
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PMID: 20923312
PDF is available here.
PDF is available here.
Medical Image Analysis (14)5 2010
Abstract
We developed a novel approach for image-based 3D motion estimation and compensation as a solution to this problem. It is based on 3D catheter tracking which, in turn, relies on 2D/3D registration. To this end, a bi-plane C-arm system is used to take X-ray images of a special circumferential mapping...
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PMID: 20579931
PDF is available here.
PDF is available here.
Medical Image Analysis (14)5 2010
Abstract
We present a reconstruction method based on a 4D time-continuous B-spline motion field. The temporal component of the motion field is parameterized by the acquisition time and does not assume a periodic heart motion. The analytic dynamic FDK-reconstruction formula is used directly for the motion est...
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PMID: 20573539
PDF is available here.
PDF is available here.