压缩传感磁共振血管造影中冠状动脉描绘性的去噪参数依赖性。

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Radiological Physics and Technology Pub Date : 2024-06-01 Epub Date: 2024-03-09 DOI:10.1007/s12194-024-00787-w
Junji Takahashi, Yoshio Machida, Kei Fukuzawa, Yoshinori Tsuji, Yuki Ohmoto-Sekine
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引用次数: 0

摘要

我们利用数值指数和视觉评估,评估了压缩传感磁共振血管造影(CS-MRA)中冠状动脉描绘性对去噪参数的依赖性。这项研究旨在阐明加速因子(AF)和去噪因子(DF)对 CS-MRA 图像质量的依赖性。在临床 1.5 T 系统上使用三维 CS-MRA 采集了血管模型和临床图像。在模型测量中,我们比较了各种自动增益因子和去噪因子下血管轮廓曲线的半最大值全宽(FWHM)、清晰度和对比度。在临床病例中,我们比较了各种 DF 的半最大值全宽、清晰度、对比度、信噪比、噪声水平值和视觉评估结果。幻影图像分析表明,FWHM、清晰度和对比度的测量值并没有随着自动对焦的增加而发生显著变化。FWHM和清晰度的测量值随着 DF 值的增加而略有变化。然而,对比度则随着 DF 水平的增加而增加。在临床病例中,即使改变 DF 水平,FWHM 和锐度也没有显著差异。然而,对比度却随着 DF 值的增加而下降。当临床病例的 DF 水平增加时,心肌的背景信号、脂肪和噪声水平都会降低。我们使用 CS-MRA 研究了冠状动脉描绘性对房颤和 DF 的依赖性。冠状动脉轮廓曲线分析表明,冠状动脉 CS-MRA 的 DF 越强,图像质量越好。
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Denoising parameter dependence of coronary artery depictability in compressed sensing magnetic resonance angiography.

Using numerical indices and visual evaluation, we evaluated the dependence of coronary-artery depictability on the denoising parameter in compressed sensing magnetic resonance angiography (CS-MRA). This study was conducted to clarify the acceleration factor (AF) and denoising factor (DF) dependence of CS-MRA image quality. Vascular phantoms and clinical images were acquired using three-dimensional CS-MRA on a clinical 1.5 T system. For the phantom measurements, we compared the full width at half maximum (FWHM), sharpness, and contrast ratio of the vascular profile curves for various AFs and DFs. In the clinical cases, the FWHM, sharpness, contrast ratio, signal-to-noise ratio, noise level values, and visual evaluation results were compared for various DFs. Phantom image analyses demonstrated that the respective measurements of the FWHM, sharpness, and contrast ratios did not significantly change with an increase in AF. The FWHM and sharpness measurements slightly changed with the DF level. However, the contrast ratio tended to increase with an increase in the DF level. In the clinical cases, the FWHM and sharpness showed no significant differences, even when the DF level was changed. However, the contrast ratio tended to decrease as the DF level increased. When the DF levels of the clinical cases increased, the background signals of the myocardium, fat, and noise levels decreased. We investigated the dependence of the coronary-artery depictability on AF and DF using CS-MRA. Analysis of the coronary-artery profile curves indicated that a better image quality was achieved with a stronger DF on coronary CS-MRA.

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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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