Cone Beam Computed Tomography X-ray Scattering Cone beam computed tomography (CBCT) is a compact 3D imaging technology that finds applications in various medical and industrial fields, such as orthopedics, dentistry, and interventional radiology. Despite its cost efficiency and volumetric imaging capabilities, CBCT suffers from a significant drawback – its image quality is relatively poor due to the substantial volume of x-ray illumination and scattered radiation involved. To address this issue, researchers have been focusing on antiscatter grids in recent years as a means to reduce X-ray scattering during CBCT imaging. However, the currently available commercially-produced antiscatter grids have not proven to be sufficiently effective in enhancing the quality of CBCT images for accurate quantitative measurements. This limitation impacts clinical decision-making where precise visualization of soft tissue and reliable quantitative accuracy are crucial. 2D Antiscatter Grid Dr. Cem Altunbas from the University of Colorado has introduced a groundbreaking solution to mitigate scatter intensity in CBCT projections – the innovative two-dimensional antiscatter grid ("2D ASG"). This new design exhibits remarkable results by reducing scatter intensity by a factor of 3 to 6 times, while also transmitting 20% more primary (useful) x-rays to the image receptor. As a result, CBCT image quality experiences a significant improvement due to its superior scatter rejection and enhanced primary x-ray transmission capabilities, as demonstrated in the figure. Furthermore, this advancement in technology not only enhances the visualization of low-contrast objects but also greatly improves CT number accuracy. The overall outcome is a considerable improvement in image quality while simultaneously reducing the radiation dose to the patient – a crucial advantage for maintaining patient safety during CBCT procedures. Advantages: • High image quality with reduced radiation dose to the patient • Seamless retrofitting capabilities allowing compatibility with existing flat panel detector-based CBCT systems • Uses a unique metal additive manufacturing process, allowing for customization to suit different imaging tasks and CBCT systems precisely
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