Ultra-High-Resolution Photon-Counting Detector CT Benefits Visualization of Abdominal Arteries: A Comparison to Standard-Reconstruction.

Huan Zhang, Yue Xing, Lingyun Wang, Yangfan Hu, Zhihan Xu, Haoda Chen, Junjie Lu, Jiarui Yang, Bei Ding, Weiguo Hu, Jingyu Zhong
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Abstract

This study aimed to investigate the potential benefit of ultra-high-resolution (UHR) photon-counting detector CT (PCD-CT) angiography in visualization of abdominal arteries in comparison to standard-reconstruction (SR) images of virtual monoenergetic images (VMI) at low kiloelectron volt (keV). We prospectively included 47 and 47 participants to undergo contrast-enhanced abdominal CT scans within UHR mode on a PCD-CT system using full-dose (FD) and low-dose (LD) protocols, respectively. The data were reconstructed into six series of images: FD_UHR_Br48, FD_UHR_Bv56, FD_UHR_Bv60, FD_SR_Bv40, LD_UHR_Bv48, and LD_SR_Bv40. The UHR reconstructions were performed with three kernels (Bv48, Bv56, and Bv60) within 0.2 mm. The SR were virtual monoenergetic imaging reconstruction with Bv40 kernel at 40-keV within 1 mm. Each series of axial images were reconstructed into coronal and volume-rendered images. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of seven arteries were measured. Three radiologists assessed the image quality, and visibility of nine arteries on all the images. SNR and CNR values of SR images were significantly higher than those of UHR images (P < 0.001). The SR images have higher ratings in image noise (P < 0.001), but the FD_UHR_Bv56 and FD_UHR_Bv60 images has higher rating in vessel sharpness (P < 0.001). The overall quality was not significantly different among FD_VMI_40keV, LD_VMI_40keV, FD_UHR_Bv48, and LD_UHR_Bv48 images (P > 0.05) but higher than those of FD_UHR_Bv56 and FD_UHR_Bv60 images (P < 0.001). There is no significant difference of nine abdominal arteries among six series of images of axial, coronal and volume-rendered images (P > 0.05). To conclude, 1-mm SR image of VMI at 40-keV is superior to 0.2-mm UHR regardless of which kernel is used to visualize abdominal arteries, while 0.2-mm UHR image using a relatively smooth kernel may allow similar image quality and artery visibility when thinner slice image is warranted.

超高分辨率光子计数探测器 CT 对腹部动脉可视化的益处:与标准重建的比较
本研究旨在探讨超高分辨率(UHR)光子计数探测器 CT(PCD-CT)血管造影与低千伏(keV)虚拟单能图像(VMI)的标准重建(SR)图像相比,在腹部动脉可视化方面的潜在优势。我们采用前瞻性方法,分别让 47 名和 47 名参与者在 PCD-CT 系统的 UHR 模式下,使用全剂量 (FD) 和低剂量 (LD) 方案进行对比增强腹部 CT 扫描。数据被重建为六个系列的图像:FD_UHR_Br48、FD_UHR_Bv56、FD_UHR_Bv60、FD_SR_Bv40、LD_UHR_Bv48 和 LD_SR_Bv40。UHR 重建是用三个内核(Bv48、Bv56 和 Bv60)在 0.2 毫米范围内进行的。SR 是在 1 毫米范围内使用 40-keV 的 Bv40 内核进行虚拟单能成像重建。每一系列轴向图像都被重建为冠状图像和容积渲染图像。测量了七条动脉的信噪比(SNR)和对比度-信噪比(CNR)。三位放射科医生评估了所有图像的图像质量和九条动脉的可见度。SR 图像的 SNR 和 CNR 值明显高于 UHR 图像(P 0.05),但高于 FD_UHR_Bv56 和 FD_UHR_Bv60 图像(P 0.05)。总之,无论使用哪种内核观察腹部动脉,40-keV 下 1 毫米的 VMI SR 图像都优于 0.2 毫米的 UHR 图像,而使用相对平滑内核的 0.2 毫米 UHR 图像在需要更薄的切片图像时可获得相似的图像质量和动脉可见度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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