Dual-layer dual-energy computed tomography for the assessment of hypovascular hepatic metastases: impact of closing k-edge on image quality and lesion detectability
Dual-layer dual-energy computed tomography for the assessment of hypovascular hepatic metastases: impact of closing k-edge on image quality and lesion detectability
复制标题
双层双能量计算机断层扫描用于评估乏血供肝转移瘤：闭合K边缘对图像质量及病灶检出能力的影响
DOI：
10.1007/s00330-018-5789-0
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发表时间：
2019-06-01
影响因子：
5.9
通讯作者：
Yamashita, Yasuyuki
中科院分区：
文献类型：
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作者：
Nagayama, Yasunori;Iyama, Ayumi;Yamashita, Yasuyuki
目的评价双层双能CT （dct）虚拟单能量成像（VMI）对低血管性肝转移的成像质量及其对病变检出率的影响。方法对81例经门静脉期腹腔dct检查的低血管-肝转移患者进行分析。在40-200keV （vmi40 - 200,10 - kev区间）下重建了多能量图像（PEI）和VMI。测量肝实质和转移性结节（n=288）的图像噪声、肿瘤与肝脏的对比以及对比噪声比（CNR），以确定最佳单能水平。两名放射科医师独立主观地对PEI和最佳VMI的图像质量（图像对比度、图像噪声和诊断置信度）进行5分制评估，以确定最佳能量。38个病人有10个转移瘤每个都有直径
ObjectivesTo evaluate the image quality of virtual-monoenergetic-imaging (VMI) from dual-layer dual-energy CT (DLCT) for the assessment of hypovascular liver metastases and its effect on lesion detectability.MethodsEighty-one patients with hypovascular-liver-metastases undergoing portal-venous-phase abdominal DLCT were included. Polyenergetic-images (PEI) and VMI at 40-200keV (VMI40-200, 10-keV interval) were reconstructed. Image noise, tumor-to-liver contrast, and contrast-to-noise ratio (CNR) of hepatic parenchyma and metastatic nodules (n=288) were measured to determine the optimal monoenergetic levels. Two radiologists independently and subjectively assessed the image quality (image contrast, image noise, and diagnostic confidence) of PEI and optimal VMI on 5-point scales to determine the best energy. For 38 patients having up to 10 metastases each with diameters