منابع مشابه
A novel dual energy CT-based attenuation correction method in PET/CT systems: A phantom study
In present PET/CT scanners, PET attenuation correction is performed by relying on the information given by CT scan. In the CT-based attenuation correction methods, dual-energy technique (DECT) is the most accurate approach, which has been limited due to the increasing patient dose. In this feasibility study, we have introduced a new method that can implement dual-en...
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Image contrast in CT is mostly dependent on elements with high atomic weight, such as calcium, iron, and iodine The concentrations of these elements can be calculated from dual-energy x-ray data based on their characteristic attenuation patterns Dual-energy CT may can be helpful in neuroimaging to: Differentiate between hemorrhage and iodinated contrast agents in brain parenchyma Improve CT ang...
متن کاملNonuniqueness in dual-energy CT.
PURPOSE The goal is to determine whether dual-energy computed tomography (CT) leads to a unique reconstruction using two basis materials. METHODS The beam-hardening equation is simplified to the single-voxel case. The simplified equation is rewritten to show that the solution can be considered to be linear operations in a vector space followed by a measurement model which is the sum of the ex...
متن کاملDual-energy CT in the Chest
Dual-energy CT (DECT) is accomplished by near simultaneous imaging at two energy levels, typically 80 kV and 140 kV, using scanners that either employ rapid kV switching or have two orthogonal sets of X-ray tunes and detectors mounted in the gantry. Attenuation properties differ at the two energy levels, which allow the DECT to differentiate and quantify certain substances such as water, calciu...
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ژورنال
عنوان ژورنال: Current Radiology Reports
سال: 2013
ISSN: 2167-4825
DOI: 10.1007/s40134-013-0024-x