利用视图共享和 KWIC 滤波的 GRASP 放大技术实现超快速、自由呼吸、实时心脏 Cine MRI。

IF 3.8 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Radiology. Cardiothoracic imaging Pub Date : 2024-02-01 DOI:10.1148/ryct.230107
Lexiaozi Fan, KyungPyo Hong, Bradley D Allen, Rupsa Paul, James C Carr, Sarah Zhang, Rod Passman, Joshua D Robinson, Daniel C Lee, Cynthia K Rigsby, Daniel Kim
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To achieve high temporal resolution, each time frame was reconstructed using six radial spokes, corresponding to acceleration factors ranging from 24 to 32. To compensate for loss in spatial resolution resulting from over-regularization in GRASP, VS and KWIC filtering were incorporated. The blur metric, visual image quality scores, and biventricular parameters were compared between clinical and real-time cine images. Results In pediatric patients, the incorporation of VS and KWIC into GRASP (ie, GRASP + VS + KWIC) produced significantly (<i>P</i> < .05) sharper x-y-t (blur metric: 0.36 ± 0.03, 0.41 ± 0.03, 0.48 ± 0.03, respectively) and x-y-f (blur metric: 0.28 ± 0.02, 0.31 ± 0.03, 0.37 ± 0.03, respectively) component images compared with GRASP + VS and conventional GRASP. Only the noise score differed significantly between GRASP + VS + KWIC and clinical cine; all visual scores were above the clinically acceptable (3.0) cutoff point. 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引用次数: 0

摘要

目的 使用黄金角径向稀疏并行(GRASP)重建,放大视图共享(VS)和 k 空间加权图像对比度(KWIC)滤波,在自由呼吸的实时心脏椎体磁共振成像中实现超高时间分辨率(约 20 毫秒)。材料与方法 对 14 名患有先天性心脏病的儿童患者(平均年龄 [SD],9 岁 ± 2;13 名男性)和 10 名患有心律失常的成人患者(平均年龄 62 岁 ± 8;9 名男性)进行了回顾性鉴定,他们都接受了标准屏气 cine 和使用 GRASP 的自由呼吸实时 cine。为了实现高时间分辨率,每个时间帧都使用六个径向辐条进行重建,对应的加速因子范围为 24 到 32。为了弥补 GRASP 过度规则化造成的空间分辨率损失,采用了 VS 和 KWIC 滤波技术。比较了临床和实时 cine 图像的模糊度量、视觉图像质量评分和双心室参数。结果 在儿科患者中,与 GRASP + VS 和传统 GRASP 相比,在 GRASP 中加入 VS 和 KWIC(即 GRASP + VS + KWIC)后,x-y-t(模糊度:分别为 0.36 ± 0.03、0.41 ± 0.03、0.48 ± 0.03)和 x-y-f(模糊度:分别为 0.28 ± 0.02、0.31 ± 0.03、0.37 ± 0.03)分量图像明显更清晰(P < .05)。只有噪声评分在 GRASP + VS + KWIC 和临床 cine 之间存在明显差异;所有视觉评分均高于临床可接受的临界点(3.0)。使用 GRASP + VS + KWIC 重建的临床和实时 cine 图像之间的双心室容积参数具有很强的相关性(R2 > 0.85),且一致性很好(所有参数的相对误差均小于 6%)。在成年患者中,与使用 GRASP + VS + KWIC 的实时电影图像相比,临床电影图像的所有类别的视觉评分都明显较低(P < .05),噪声除外(P = .08)。结论 在 GRASP 重建中加入 VS 和 KWIC 滤波可实现超高时间分辨率(约 20 毫秒),而不会明显降低空间分辨率。关键词Cine、视图共享、k-空间加权图像对比度过滤、径向 k-空间、儿科、心律失常、GRASP、压缩传感、实时、自由呼吸 本文有补充材料。© RSNA, 2024.
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Ultra-rapid, Free-breathing, Real-time Cardiac Cine MRI Using GRASP Amplified with View Sharing and KWIC Filtering.

Purpose To achieve ultra-high temporal resolution (approximately 20 msec) in free-breathing, real-time cardiac cine MRI using golden-angle radial sparse parallel (GRASP) reconstruction amplified with view sharing (VS) and k-space-weighted image contrast (KWIC) filtering. Materials and Methods Fourteen pediatric patients with congenital heart disease (mean age [SD], 9 years ± 2; 13 male) and 10 adult patients with arrhythmia (mean age, 62 years ± 8; nine male) who underwent both standard breath-hold cine and free-breathing real-time cine using GRASP were retrospectively identified. To achieve high temporal resolution, each time frame was reconstructed using six radial spokes, corresponding to acceleration factors ranging from 24 to 32. To compensate for loss in spatial resolution resulting from over-regularization in GRASP, VS and KWIC filtering were incorporated. The blur metric, visual image quality scores, and biventricular parameters were compared between clinical and real-time cine images. Results In pediatric patients, the incorporation of VS and KWIC into GRASP (ie, GRASP + VS + KWIC) produced significantly (P < .05) sharper x-y-t (blur metric: 0.36 ± 0.03, 0.41 ± 0.03, 0.48 ± 0.03, respectively) and x-y-f (blur metric: 0.28 ± 0.02, 0.31 ± 0.03, 0.37 ± 0.03, respectively) component images compared with GRASP + VS and conventional GRASP. Only the noise score differed significantly between GRASP + VS + KWIC and clinical cine; all visual scores were above the clinically acceptable (3.0) cutoff point. Biventricular volumetric parameters strongly correlated (R2 > 0.85) between clinical and real-time cine images reconstructed with GRASP + VS + KWIC and were in good agreement (relative error < 6% for all parameters). In adult patients, the visual scores of all categories were significantly lower (P < .05) for clinical cine compared with real-time cine with GRASP + VS + KWIC, except for noise (P = .08). Conclusion Incorporating VS and KWIC filtering into GRASP reconstruction enables ultra-high temporal resolution (approximately 20 msec) without significant loss in spatial resolution. Keywords: Cine, View Sharing, k-Space-weighted Image Contrast Filtering, Radial k-Space, Pediatrics, Arrhythmia, GRASP, Compressed Sensing, Real-Time, Free-Breathing Supplemental material is available for this article. © RSNA, 2024.

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