Reduction of peristalsis-related gastrointestinal streak artifacts with dual-energy CT: a patient and phantom study
Reduction of peristalsis-related gastrointestinal streak artifacts with dual-energy CT: a patient and phantom study
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DOI：
10.1007/s00261-016-0702-2
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发表时间：
2016-08-01
影响因子：
2.4
通讯作者：
Yeh, Benjamin M.
中科院分区：
文献类型：
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作者：
Winklhofer, Sebastian;Lambert, Jack W.;Yeh, Benjamin M.
目的：本研究的目的是评估快速千伏开关（RS）双能量计算机断层扫描（DECT），以减少乳腺癌相关的条纹artifaction.Methods：100例连续患者（48名男性，52名女性，平均年龄57岁）的rsDECT图像的能力进行了回顾性评价，在这个机构审查委员会批准的研究。图像重建包括虚拟单色70和120 keV图像，以及碘（-水）和水（-碘）材料分解图像。我们定性（4分制）和定量（碘/水浓度、Hounsfield单位、灰度值（戈伊））记录伪影的存在和严重程度，并与相应的未受影响的参考组织进行比较。类似的措施，在DECT图像的乳房假体。Wilcoxon符号秩和配对t检验被用来比较不同的图像reconstruction.Results：蠕动相关的条纹伪影被发现在49（49%）的DECT检查之间的结果。70、120和水（-碘）图像中的伪影比碘（-水）图像中的伪影严重得多（定性读数P < 0.001）。在70、120 keV和水（-碘）图像中，伪影和参考组织之间的定量测量值存在显著差异（每次图像重建的HU和戈伊均为P < 0.001），但在碘（-水）图像中无显著差异（碘浓度P = 0.088和戈伊P = 0.111）。类似的结果被认为是在pathesis DECT幻影study.Conclusions：蠕动相关的条纹伪影看到70，120 keV，和水（碘）图像大幅减少碘（水）图像在rsDECT。
Objective: The purpose of the study was to assess the ability of rapid-kV switching (rs) dual-energy computed tomography (DECT) to reduce peristalsis-related streak artifact.Methods: rsDECT images of 100 consecutive patients (48 male, 52 female, mean age 57 years) were retrospectively evaluated in this institutional review board-approved study. Image reconstructions included virtual monochromatic 70 and 120 keV images, as well as iodine(-water) and water(-iodine) material decomposition images. We recorded the presence and severity of artifacts qualitatively (4-point scale) and quantitatively [iodine/water concentrations, Hounsfield units, gray scale values (GY)] and compared to corresponding unaffected reference tissue. Similar measures were obtained in DECT images of a peristalsis phantom. Wilcoxon signed-rank and paired t tests were used to compare results between different image reconstructions.Results: Peristalsis-related streak artifacts were found in 49 (49%) of the DECT examinations. Artifacts were significantly more severe in 70, 120, and water(-iodine) images than in iodine(-water) images (qualitative readout P < 0.001, each). Quantitative measurements were significantly different between the artifact and the reference tissue in 70, 120 keV, and water(-iodine) images (P < 0.001 for both HU and GY for each image reconstruction), but not significantly different in iodine(-water) images (iodine concentrations P = 0.088 and GY P = 0.111). Similar results were seen in the peristalsis DECT phantom study.Conclusions: Peristalsis-related streak artifacts seen in 70, 120 keV, and water(-iodine) images are substantially reduced in iodine(-water) images at rsDECT.