Wu Rongli, Watanabe Yoshiyuki, Satoh Kazuhiko, Liao Yen-Peng, Takahashi Hiroto, Tanaka Hisashi, Tomiyama Noriyuki
Human Brain Research Center, Kyoto University, Graduate School of Medicine, Kyoto, Kyoto, Japan.
J Comput Assist Tomogr. 2018 Jul/Aug;42(4):648-654. doi: 10.1097/RCT.0000000000000726.
The aim of this study was to quantitatively compare the reduction in beam hardening artifact (BHA) and variance in computed tomography (CT) numbers of virtual monochromatic energy (VME) images obtained with 3 dual-energy computed tomography (DECT) systems at a given radiation dose.
Five different iodine concentrations were scanned using dual-energy and single-energy (120 kVp) modes. The BHA and CT number variance were evaluated.
For higher iodine concentrations, 40 and 80 mgI/mL, BHA on VME imaging was significantly decreased when the energy was higher than 50 keV (P = 0.003) and 60 keV (P < 0.001) for GE, higher than 80 keV (P < 0.001) and 70 keV (P = 0.002) for Siemens, and higher than 40 keV (P < 0.001) and 60 keV (P < 0.001) for Toshiba, compared with single-energy CT imaging.
Virtual monochromatic energy imaging can decrease BHA and improve CT number accuracy in different dual-energy computed tomography systems, depending on energy levels and iodine concentrations.
本研究旨在定量比较在给定辐射剂量下，使用3种双能计算机断层扫描（DECT）系统获得的虚拟单色能量（VME）图像中，线束硬化伪影（BHA）的减少情况以及计算机断层扫描（CT）数值的方差。
使用双能和单能（120 kVp）模式扫描5种不同的碘浓度。评估BHA和CT数值方差。
对于较高碘浓度（40和80 mgI/mL），与单能CT成像相比，当能量高于50 keV（P = 0.003）和60 keV（P < 0.001）时，GE系统的VME成像上的BHA显著降低；当能量高于80 keV（P < 0.001）和70 keV（P = 0.002）时，西门子系统的BHA显著降低；当能量高于40 keV（P < 0.001）和60 keV（P < 0.001）时，东芝系统的BHA显著降低。
虚拟单色能量成像可以减少不同双能计算机断层扫描系统中的BHA，并提高CT数值的准确性，这取决于能量水平和碘浓度。
