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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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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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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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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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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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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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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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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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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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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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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Acquiring diagnostic images of a patient’s vasculature can be difficult and time consuming. Some magnetic resonance imaging (MRI) techniques employ contrast-enhancing agents, such as gadolinium, tha...
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Iron is an essential nutrient for the human body but is toxic in excess. Iron overload is a particular hazard to patients requiring regular blood transfusions. Treatment for patients with iron overloa...
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Visualizing a patient’s heart by non-invasive cardiovascular imaging is a powerful tool for diagnosis and therapy. Yet the heart’s movement and small branching arteries make quality cardiac imagin...
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MRI produces medically valuable images of a patient’s internals using magnetic fields and pulses that align and excite nuclei. The signals emitted by excited nuclei can be measured in ‘k-space’ ...
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Magnetic resonance imaging (MRI) of metallic implants can be challenging because metal and surrounding tissue impact the main magnetic field differently. Such magnetic field inhomogeneities cause off-...
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A leading method for reducing motion blurring in medical imaging is called PROPELLER (Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction). It allows doctors to track and help...
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Quantitative magnetic resonance imaging (qMRI) is a clinical procedure that can yield imaging biomarkers more sensitive and specific to underlying disease than regular MRI. It works by fitting images ...
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Chemical shift-based multi-echo water-fat separation methods have seen increased use in routine magnetic resonance imaging (MRI) clinical applications. These methods involve collecting multiple echoes...
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Visualizing a body’s internal structures by MRI is an essential clinical practice. Yet acquiring images in the presence of metal, like the steel screws of an implant, remains challenging because of ...
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Elucidating the workings and development of the brain remains a fertile topic of investigation and one reliant on non-invasive visualization technology like magnetic resonance imaging (MRI). As app...
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An excess of visceral adipose tissue (VAT), or fat stored in the abdomen, is known to be a dominant risk factor in developing metabolic syndrome, the not fully understood clustering of metabolic and c...
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Generating a set of uniformly-distributed points on the surface of a sphere via a deterministic scheme is important for biomedical imaging and engineering applications, especially MR imaging. A point ...
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Magnetic resonance imaging (MRI) utilizes the signal induced by excited spins when human tissue is subjected to a uniform magnetic field. The individual magnetic moments of the nuclear spins in the ti...
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Current MRI techniques to obtain images of rapidly changing anatomies such as the beating heart or to monitor the flow of fluids such as contrast agents through organs and peripheral vasculature acqui...
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