In modern computed tomography (CT) imaging, a number of non-ideal physical conditions may cause artifacts in the reconstructed images. Mitigation or elimination of image artifacts has been a time- and...
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Routinely, data acquired with medical imaging systems are not consistent with a single true image of the subject. Data inconsistencies arise from various causes (beam-hardening effects, subject motion...
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Computed tomography (CT) provides rapid, noninvasive imaging at high resolution. Conventional CT systems include a gantry, one or two X-ray tubes and a detector assembly that rotate together around a ...
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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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X-ray computed tomography (CT) is an imaging technique that generates cross-sectional images of a patient by combining multiple X-ray images taken at a range of angles. A patient may be physically mov...
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Computed tomography (CT) systems are medical imaging devices that use X-rays to image a patient internally. An X-ray source sends parallel beams through the patient. The X-ray absorption/scattering,...
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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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Breast cancer is the most common cancer among women today with all women having approximately an 11 to12 percent chance of developing this cancer and a 30 to 40 percent chance of death after developme...
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Computed tomography (CT) is a medical imaging method that creates 3-D images from a large set of 2-D images by measuring the attenuation of an X-ray beam’s signal that is directed transversely t...
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Conventional CT scans utilize a fan-shaped X-ray beam source and a detector array to acquire data for 2-D medical imaging. The source and detector array are situated on opposite sides of the patient ...
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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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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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Computed tomography (CT) is used as a diagnostic imaging modality to generate three-dimensional images of the inside of an object. When a metallic object, such as a surgical clip, is present in a subj...
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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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In recent years, statistical imaging reconstruction has been introduced in clinics by different computed tomography (CT) manufacturers as a means to reduce radiation dose levels. Essentially, the meth...
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Dual-energy computed tomography (CT) was first proposed in the 1970s but has wavered in practical usage ever since. In essence, the process employs two different X-ray spectra (i.e., a high energy lev...
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Phase contrast imaging exploits differences in the refractive index of materials to differentiate and image them. Recently, X-ray phase contrast imaging has attracted a great deal of attention. In the...
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With the advance of photon counting technology, spectral CT (multi-energy CT) has attracted lots of attention. The technique utilizes X-ray spectral information to identify and differentiate materials...
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Iterative image reconstruction techniques can be used to produce high quality tomographic images from noise-contaminated data. It is known that a statistical weight is critical for great image quality...
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With conventional image reconstruction, a single image is produced from a corresponding set of data. For example, an image can be reconstructed from a single CT sonogram or one MRI data set. Such dire...
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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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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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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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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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The introduction of 2-D detector arrays significantly improved the diagnostic potential of computed tomography (CT). However, accurate and efficient image construction from the data provided by these ...
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