High Efficiency Anti-scatter Grid System for Fluoroscopy

用于透视的高效防散射网格系统

• 批准号: 8059997
• 负责人: Gary T. Barnes
• 金额: $ 30.04万
• 依托单位: X-RAY IMAGING INNOVATIONS
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8059997
• 关键词: Abdomen; Accounting; Air; Angiography; Benchmarking; Cardiac; Catheterization; Charge; Clinical; Diagnostic radiologic examination; Dose; Dose-Rate; Evaluation; Feathers; Fluoroscopy; Generations; Government; Image; Laboratories; Left; Manufacturer Name; Measurement; Measures; Medical; Medical Imaging; Modeling; Morphologic artifacts; Patients; Performance; Persons; Phase; Physiologic pulse; Procedures; Pulse Rates; Radiation; Research; Shapes; Skin; Spottings; System; Tantalum; Technology; Text; Thick; Time; Tube; Water; Width; base; density; design; design and construction; detector; digital; digital imaging; improved; innovation; interest; prototype; radiologist; receptor; vibration

DESCRIPTION (provided by applicant): Antiscatter grids currently employed on fluoroscopic systems are limited in their capability to control scatter. As a result, fluoroscopic radiation levels are higher for the average patient than they would be with a more efficient grid system, and higher still for large patients. Poor image quality often increases the beam-on time required to successfully perform interventional procedures, increasing the radiation dose still further. This problem is critical in interventional exams, where skin doses are occasionally high enough to induce radiation burns1-3, and effective doses often exceed those of CT exams4 and contribute about 14% of the nationwide effective dose from medical imaging procedures5. Our proposal is to develop a high efficiency antiscatter grid system that will result in a significant improvement in fluoroscopy system dose efficiency. The results of our benchmarked Monte Carlo modeling indicate that a factor of 1.5 to 2.0 or more improvement is achievable. Cardiologists and radiologists can use this improvement either to produce higher quality images at current fluoroscopic radiation levels, allowing them to shorten exams, or to produce images comparable to today's image quality standards at markedly lower dose rates. The proposed innovative antiscatter grid system will incorporate a coarse strip density, air interspaced grid and a reciprocating grid drive with innovative approaches to suppress vibrations and grid artifacts. In Phase I we will build a grid and drive system and demonstrate: 1) the use of the system in fluorographic (digital spot) imaging; 2) the robust suppression of grid artifacts; and 3) a dose efficiency at least 1.5 times greater than that of commonly used grids. In Phase II we will build a vibration-free reciprocating drive system suitable for fluoroscopic imaging, a compact x-ray tube grid bias supply to perform fast x-ray switching for short x-ray pulses, and with our manufacturing partner we will modify a commercially available clinical fluoroscopy unit to demonstrate the use and performance of the grid system. Of practical importance is that the domestic manufacturer has already expressed interest in evaluating the grid system for inclusion in their product line and in commercializing the technology. PUBLIC HEALTH RELEVANCE: Millions of fluoroscopic examinations are performed each year, and these exams often result in high patient radiation doses and injury1-3, are among the highest dose exams in medical imaging4, and account for 14% of the effective dose from medical imaging in the United States5. We propose to improve the dose efficiency of fluoroscopy by a factor of 1.5 to 2.0 or more. This significant improvement will be accomplished by building an innovative high efficiency antiscatter grid system; clinical fluoroscopic systems using this grid system will be able to achieve markedly improved image quality at current radiation dose levels, or alternatively will be able to achieve image quality comparable to that obtained on today's fluoroscopic systems at a fraction of the radiation dose.

描述（由申请人提供）：当前在荧光镜系统上使用的抗探望者网格在控制散射的能力方面受到限制。结果，普通患者的荧光镜辐射水平高于更有效的网格系统，而大型患者的荧光辐射水平仍高。差的图像质量通常会增加成功执行介入程序所需的光束时间，从而进一步增加辐射剂量。这个问题对于介入检查至关重要，在介入的检查中，皮肤剂量偶尔足够高以诱导辐射燃烧1-3，而有效剂量通常超过CT考试4，并且从医学成像程序中贡献了大约14％的全国有效剂量的14％。我们的建议是开发高效率的抗议者网格系统，该系统将显着改善荧光镜检查剂量效率。我们的基准蒙特卡洛建模的结果表明，可以实现1.5至2.0或更多改进的系数。心脏病专家和放射科医生可以使用此改进来在当前的荧光镜辐射水平上产生更高质量的图像，从而使其缩短考试，或者以明显较低的剂量率显着地与当今的图像质量标准相提并论。提出的创新的抗监视器网格系统将结合粗条带密度，空间间隔网格和往复式网格驱动器，采用创新方法来抑制振动和网格伪像。在第一阶段，我们将构建一个网格和驱动系统并演示：1）在荧光图（数字点）成像中使用该系统； 2）对网格伪像的强烈抑制； 3）剂量效率至少是常用网格的剂量效率的1.5倍。在第二阶段，我们将建立一个适合荧光成像的无振动往复驱动系统，紧凑型X射线管网格偏置电源可为短X射线脉冲执行快速的X射线切换，而我们的制造伙伴将修改商业可用的临床荧光镜检查以证明和表现网格系统的使用和性能。实际上的重要性是，国内制造商已经表示有兴趣评估网格系统将其包含在其产品线中和商业化技术。 公共卫生相关性：每年进行数百万次荧光检查检查，这些检查通常导致患者辐射剂量高和损伤1-3，是医学成像中最高的剂量检查之一，占美国医学成像中有效剂量的14％。我们建议将荧光镜检查的剂量效率提高1.5至2.0或更多。通过建立创新的高效率抗议者网格系统，将实现这一重大改进；使用此网格系统的临床荧光镜系统将能够在当前辐射剂量水平下明显提高图像质量，或者可以实现与当今荧光镜系统在辐射剂量的一小部分中获得的图像质量。