Background: In intensity modulated radiation therapy, cone beam computed tomography (CT) has been used to evaluate patients prior to treatment. This study conducted a comparative evaluation of the image reconstruction ability of the clinically used half-fan bowtie filter and the full-fan bowtie filter. Materals and Methods: A CT simulation marker was inserted inside a human phantom, and the pel...

“Beijing 1” is one Micro-satellite of the international Disaster Monitoring Constellation (DMC). It was launched successfully in 2005, and has high-powered characteristic, such as high gaining data ability, high storage ability, high space resolution, high time resolution and low cost. At present it is necessary to make objective appraisal for image quality and application potential in differen...

Gastrointestinal Tracking This cover shows a micro-computed tomography scan image of 3D-printed radiopaque microdevices with an arrow design providing X-ray traceability, as well potential improved gastrointestinal retention and transit, within oral drug delivery. work is found in article 2201897 by Tien-Jen Chang, Rolf Bech Kjeldsen, co-workers.

DECT means acquiring the same object at two different energies, respectively two different tube voltages U1 and U2. The raw data q1 and q2 undergo a decomposition process of type p = p(q1,q2). The raw data p are reconstructed to obtain monochromatic images of the attenuation mu, of the object density rho, or of a specific material distribution. Recent advances in DECT focus on noise reduction t...

In the last years, x-ray computed tomography (CT) has gained more and more importance in metrology. However, computed tomography is a complex and indirect measurement procedure. Many factors contribute to the measurement result, which makes it difficult for the user to relate cause and effect. For example, the userset scan parameters significantly influence the measurement result. However, the ...

Objective: To optimize scan time and X-ray dose with no loss of image quality for retrospectively-gated micro-CT scans of free-breathing rats. Methods: Five free-breathing rats were scanned using a dynamic micro-CT scanner over 10 continuous gantry rotations (50 seconds and entrance dose of 0.28 Gy). The in-phase projection views were selected and reconstructed, representing peak inspiration an...

This work is a primary achievement in studying the CO2 and N2–oil systems. To predict gas-liquid relative permeability curves, a Shan-Chen type multicomponent multiphase lattice Boltzmann model for two-phase flow through 2D porous media is developed. Periodic and bounce back boundary conditions are applied to the model with the Guo scheme for the external body force (i.e.,...

The aim was to evaluate the adaptation of CAD/CAM occlusal veneer with different cement space settings using micro CT scan. Three groups IPS e.max-CAD lithium disilicate veneers (30, 40, and 50 µm) were produced. A circle 20 diameters centered at center same image position every scanned specimen scan measure four locations [Occlusal (OCG), axial (AXG), Marginal (MAG), absolute marginal discrepa...

From an engineering background, it is often believed that the human anatomy has already been fully described. Radiology has greatly contributed to understand the inside of the human body without surgical intervention. Despite great advances in clinical CT scanning, image quality is still related to a limited amount X-ray exposure for the patient safety. This limitation prevents fine anatomical ...