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102 Results for 'MRI'
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Technology
Magnetic Resonance Imaging of Metabolites
In magnetic resonance imaging (MRI), tissue is scanned using magnetic fields that excite atoms and cause them to emit signals. These nuclear magnetic resonance (NMR) signals can be processed into an i...
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Scott Reeder | P06190US
Technology
Real-Time MRI Guides Surgical Intervention and Limits Human Error
Many invasive procedures, such as neurosurgeries or breast biopsies, involve inserting a rigid device into the body. To minimize human error, technologies like MRI allow the surgeon to guide the preci...
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Walter Block, Ethan Brodsky, Miles Olsen | P150226US01
Technology
Improved Phantom for Iron and Fat Quantification MRI
The ability to quantify fat concentration in the body has become increasingly important given the rise in obesity and related comorbidities. Likewise, the ability to quantify iron concentration is imp...
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Scott Reeder, Diego Hernando Arribas, Samir Sharma | P150328US01
Technology
Controlling Motion Effects in MRI
Magnetic resonance imaging (MRI) is sensitive to patient movements due to the long scan times sometimes required. A major source of motion is breathing, which causes artifacts to appear in MR images. ...
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Kevin Johnson | P150149US01
Technology
High Accuracy Angle Measuring Device for Industrial, Medical, Scientific or Recreational Use
The ability to measure movement of rotating components with high accuracy is crucial in many applications, including astronomical telescope mounts, field surveillance tools, industrial inspection and ...
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Dennis Mikkelson | T130018US02
Technology
Faster, Higher Quality Medical Imaging
Magnetic resonance imaging (MRI) and computed tomography (CT) have become invaluable tools for learning about a patient’s health. However, systems are limited by acquisition speed, which often leads...
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Alexey Samsonov, Julia Velikina | P150024US01
Technology
Faster, Distortion-Free MRI Near Metallic Implants
Surgical replacement of joints with mechanical prostheses is on the rise. Unfortunately, complications such as infection and loosening are common and often diagnosed in the late stages, compelling rep...
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Nathan Artz, Curtis Wiens | P150006US01
Technology
Semi-Automated Segmentation Improves Knee MRI
Magnetic resonance imaging (MRI) provides high-resolution visualization of soft tissues, allowing diseases to be diagnosed and tracked. In particular, MR images can be used to assess joint degeneratio...
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Kwang Won Choi, Chihwa Song, Richard Kijowski, Darryl Thelen | P140270US01
Technology
Robust Magnetic Field Map Estimation Improves MRI Fat-Water Separation
In magnetic resonance imaging (MRI), the main magnetic field is symbolized B0. Accurately estimating a B0 field map is critical to distinguishing different chemical species like water and fat. If the ...
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Scott Reeder, Nathan Artz, Samir Sharma | P130370US01
Technology
Clearer MRI Near Metallic Implants
More than a million joint replacements were performed in the Unites States in 2012 and more than four million implant surgeries are expected in 2030. Such implants pose a challenge to magnetic resonan...
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Scott Reeder, Nathan Artz, Matthew Smith | P140004US01
Technology
Improved MRI with Radio Frequency Coil Decoupling Circuit to Enhance Image Quality
Magnetic resonance imaging (MRI) is a diagnostic imaging technique that is especially effective for soft tissues such as the brain and other organs. To produce an MR image the patient is subject...
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Krishna Kurpad, Wonje Lee, Eddy Boskamp | P06333US
Technology
Real-Time Progressive Medical Image Reconstruction Method for Time-Resolved Data
Computed tomography (CT) systems are used for medical imaging and produce images by measuring the loss in an X-ray beam’s strength. These measurements are used to reconstruct an image in 2-D or...
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Guang-Hong Chen, Jie Tang | P08250US
Technology
Image Reconstruction Method for Computed Tomography and Magnetic Resonance Cardiac Imaging
Magnetic resonance imaging (MRI) is a medical imaging technique that takes measurements, or “views,” of a subject’s nuclear magnetic resonance (NMR) to form images of internal struct...
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Charles Mistretta, Julia Velikina, Oliver Wieben | P06479US
Technology
Highly Constrained Image Reconstruction for Medical Imaging Applications
Magnetic resonance imaging (MRI) is a medical imaging technique that measures a subject’s nuclear magnetic resonance (NMR) to form images of internal structures. Computed tomography (CT) is ano...
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Charles Mistretta | P06088US
Technology
Combining VIPR with Inversion Recovery for Improved MRI
In 2-D medical imaging, a pulse sequence called inversion recovery (IR) can be used to obtain multiple images of an area with varying magnetization contrast. This helps improve diagnostic certainty. D...
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Steven Kecskemeti, Andrew Alexander | P130082US01
Technology
Single MRI Scan Acquires Multiple Sets of Inversion Recovery Data
Inversion recovery (IR) techniques commonly are used in MRI either to null signals or increase signal contrast between tissues. In the process, different types of radiofrequency pulses are followed by...
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Steven Kecskemeti, Andrew Alexander | P130278US01
Technology
Removal of Chemical Shift Artifacts in Magnetic Resonance Images with Alternating Readout Gradients
Magnetic resonance (MR) imaging technology is used to measure nuclear magnetic resonance (NMR) from various substances in human tissue to produce medical images for qualitative and quantitative assess...
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Scott Reeder | P06231US
Technology
Point Sets for Higher-Quality MRI
The problem of constructing a set of points uniformly distributed across the surface of a sphere dates to the early 20th century. The problem is of great importance to modern biomedical imaging and ma...
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Cheng Koay | P120355US01
Technology
Ultra-High Frame Rate, Time-Resolved, 4-D MRA
Since the introduction of angiography, there have been many attempts to develop techniques that provide diagnostic images of the vasculature while reducing invasiveness.
A technique called 4-D DSA (d...
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Charles Mistretta | P110289US01
Technology
High-Resolution R2 Mapping with Chemical Species Separation
In magnetic resonance imaging (MRI), the amount of data required to reconstruct an image can be decreased using ‘partial k-space’ sampling. This type of sampling enables shorter breath-hol...
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Scott Reeder, Diego Hernando Arribas, Valentina Taviani | P120316US01
Technology
Evaluating Systemic Cancers
Assessing treatment response in cancer patients is essential to manage their disease and evaluate therapy. Computed tomography (CT) is widely used to monitor cancer treatment by measuring changes in t...
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Robert Jeraj, Glenn Liu | P120188US01
Technology
Probing Disease Chemistry with Joint Spatial and Spectral Imaging
Magnetic resonance spectroscopy (MRS) provides a noninvasive means of discovering and quantifying chemical compounds within an area of interest like the brain. The underlying principle is that the ato...
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Sean Fain, Kevin Johnson, Jeremy Gordon | P130133US01
Technology
Confidence Maps for MRI Parametric Mapping
Magnetic resonance parametric mapping is a general framework for measuring important biomarkers. In the process, several images from the same field of view are obtained using different acquisition par...
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Scott Reeder, Diego Hernando Arribas | P120292US01
Technology
Medical Imaging with Better Temporal Fidelity Can Streamline Stroke Care
The outcome of a stroke can hinge on the time spent on diagnosis and intervention. Perfusion imaging is a critical step in the process, wherein a patient is scanned to identify salvageable tissue. The...
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Guang-Hong Chen, Jie Tang | P130041US01
Technology
Wirelessly Tracking Interventional Medical Device with MRI System
Interventional medical procedures can be performed less invasively, and more safely, when guided by magnetic resonance imaging (MRI). Placing devices like catheters, guidewires and stents using MRI gu...
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Krishna Kurpad, Madhav Venkateswaran | P120271US01