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.

说明书(由申请人提供)：目前在透视系统上使用的反散射栅格在其控制散射的能力方面是有限的。因此，普通患者的透视辐射水平比使用更高效的网格系统时更高，对于大型患者来说更高。较差的图像质量通常会增加成功执行介入手术所需的束流开启时间，从而进一步增加辐射剂量。这一问题在介入检查中至关重要，在介入检查中，皮肤剂量有时高到足以引起辐射烧伤1-3，有效剂量往往超过CT检查4，并占全国医学成像程序有效剂量的14%左右。我们的建议是开发一种高效的反散射栅格系统，这将导致荧光透视系统剂量效率的显着提高。我们的基准蒙特卡罗模型的结果表明，可以实现1.5到2.0倍或更多的改进。心脏病专家和放射科医生可以利用这一改进，在当前的透视辐射水平下产生更高质量的图像，使他们能够缩短检查时间，或者以明显较低的剂量率产生与当今图像质量标准相当的图像。拟议的创新反散射网格系统将结合粗条密度、空气间隔网格和往复网格驱动，并采用创新方法来抑制振动和网格伪影。在第一阶段，我们将构建栅格和驱动系统，并演示：1)该系统在荧光照相(数字斑点)成像中的使用；2)栅格伪影的稳健抑制；以及3)剂量效率至少是常用栅格的1.5倍。在第二阶段，我们将建造一个适用于透视成像的无振动往复驱动系统，一个紧凑型X射线管栅偏置电源，用于对短X射线脉冲执行快速X射线切换，我们将与我们的制造合作伙伴一起改装一台商用临床荧光透视仪，以演示栅格系统的使用和性能。具有实际意义的是，国内制造商已经表示有兴趣评估电网系统，将其纳入其产品线，并将该技术商业化。 公共卫生相关性：每年进行数百万次透视检查，这些检查往往会导致患者辐射剂量高和伤害1-3，是医学成像中剂量最高的检查4，占美国医学成像有效剂量的14%。我们建议将透视的剂量效率提高1.5到2.0倍或更多。这一重大改进将通过建立创新的高效反散射栅格系统来实现；使用该栅格系统的临床荧光系统将能够在当前辐射剂量水平下实现显著改善的图像质量，或者将能够在辐射剂量的一小部分获得与今天的荧光系统所获得的图像质量相当的图像质量。