A two-dimensional antiscatter grid for dental cone beam computed tomography

用于牙科锥形束计算机断层扫描的二维防散射网格

• 批准号: 10258749
• 负责人: Cem Altunbas
• 金额: $ 19.66万
• 依托单位: M2 TECHNOLOGIES LLC
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-21 至 2023-09-21
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10258749
• 关键词: 3-Dimensional; 3D Print; Address; Affect; Algorithms; Anatomy; Attenuated; Bone Density; Characteristics; Cone; Data; Dental; Dental Technology; Dentistry; Devices; Diagnostic; Diagnostic radiologic examination; Dose; Geometry; Growth; Image; Imaging Phantoms; Implant; Machine Learning; Manufacturer Name; Measurement; Measures; Metals; Methods; Morphologic artifacts; Noise; Operative Surgical Procedures; Patients; Phase; Radiation Dose Unit; Radiation Scattering; Radiation therapy; Residual state; Resolution; Roentgen Rays; Signal Transduction; Site; Source; System; Technology; Thinness; Three-Dimensional Imaging; Time; Tissues; Visualization; Work; X-Ray Computed Tomography; absorption; base; clinical decision support; clinical implementation; clinical practice; cone-beam computed tomography; cost; craniofacial; density; design; detector; experimental study; imager; imaging modality; improved; machine learning method; new technology; novel; patient variability; physical property; preservation; prototype; sensor; soft tissue; transmission process; two-dimensional

Project summary Cone beam computed tomography (CBCT) is a commonly used 3D x-ray imaging modality in dental and craniofacial imaging. While CBCT is primarily employed in evaluating bony anatomy in 3D, soft tissues are often poorly visualized in dental CBCT images. Moreover, tissue densities cannot be extracted accurately from CBCT images. The main culprit behind this problem is scattered radiation. Scattered x-rays emanating from the patient are registered by the x-ray sensor, severely degrading the fidelity of image signals. Thus, in this project, we propose a novel two-dimensional antiscatter grid (2D grid) to substantially improve the dental CBCT image quality. Our proposed 2D grid will attenuate scattered x-rays effectively, while transmitting primary, or useful, x-rays to the image sensor. Once successfully implemented, our 2D grid will provide significantly improved soft tissue visualization, accurate bone density measurement, and will reduce image artifacts. Alternatively, our 2D grid can reduce imaging radiation dose while providing comparable contrast-to- noise ratio with respect to current dental CBCT images. To implement our proposed 2D grid technology, (1) we will investigate the optimal physical characteristics of 2D grids to achieve effective scatter suppression and high primary transmission. (2) We will evaluate the improvement in CBCT image quality provided by 2D grid in phantom imaging experiments.

项目概要 锥形束计算机断层扫描 (CBCT) 是牙科和医学领域常用的 3D X 射线成像方式 颅面成像。虽然 CBCT 主要用于评估 3D 骨骼解剖结构，但软组织通常 牙科 CBCT 图像中的可视化效果很差。此外，无法从 CBCT 中准确提取组织密度 图像。这个问题背后的罪魁祸首是散射辐射。患者身上发出的散射 X 射线 由 X 射线传感器记录，严重降低图像信号的保真度。 因此，在这个项目中，我们提出了一种新颖的二维抗散射网格（2D网格）来大幅提高 牙科 CBCT 图像质量。我们提出的 2D 网格将有效衰减散射 X 射线，同时传输 到达图像传感器的主要或有用的 X 射线。一旦成功实施，我们的二维网格将提供 显着改善软组织可视化，骨密度测量准确，并且会减少图像 文物。或者，我们的 2D 网格可以减少成像辐射剂量，同时提供可比较的对比度 相对于当前牙科 CBCT 图像的噪声比。 为了实现我们提出的二维网格技术，（1）我们将研究二维的最佳物理特性 网格以实现有效的散射抑制和高一次传输。 (2) 我们将评估 体模成像实验中二维网格提供的 CBCT 图像质量得到改善。