Stair-step artifacts with single versus multiple detector-row helical CT.
Stair-step artifacts with single versus multiple detector-row helical CT.
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单排螺旋 CT 与多排探测器螺旋 CT 的阶梯伪影。
DOI：
10.1148/radiology.216.1.r00jn13185
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Napel,S
中科院分区：
文献类型：
--
作者：
Fleischmann,D;Rubin,GD;Paik,DS;Yen,SY;Hilfiker,PR;Beaulieu,CF;Napel,S
目的：比较单排和多排探测器螺旋CT（CT）采集参数对伪影大小和外观的影响。使用单排探测器在等中心和距离等中心100 mm处扫描相对于z轴倾斜45°的（12.7 × 305.0 mm）丙烯酸棒（单通道）螺旋CT（波束宽度，1-10 mm;间距，1.0、2.0或3.0）和多探测器行（四通道）螺旋CT（探测器宽度，1.25、2.5、3.75和5 mm;螺距，0.75或1.5）。沿棒沿着半径测量值的SD（SDr）用于量化所有72个数据集中的伪影并分析其频率模式。体积渲染图像的数据集进行了排名，由六个独立的和盲读者，结果与采集参数和SDrmeasurements.RESULTS：SDrwas小于在四个比单通道螺旋CT任何给定的表增量（TI）。在单通道螺旋CT中，SDr随束宽线性增加，随螺距几何增加。在四通道螺旋CT中，SDr测量值与TI成正比，与所使用的探测器宽度和螺距组合无关。偏离中心的目标位置平均增加SDr的一个因素的1.6倍的单通道螺旋CT和一个因素的2.0倍的四通道螺旋CT。图像质量的主观等级与SDr有很好的相关性（Spearmanr= 0.94，P <0.001）。结论：对于任何给定的TI，与单通道螺旋CT相比，四通道螺旋CT的伪影在数量上和主观上都更小。
PURPOSE:To compare the effects of acquisition parameters on the magnitude and appearance of artifacts between single and multiple detector-row helical computed tomography (CT).MATERIALS AND METHODS:A cylindric (12.7 × 305.0-mm) acrylic rod inclined 45° relative to the z axis was scanned at the isocenter and 100 mm from the isocenter with single detector-row (single-channel) helical CT (beam width, 1–10 mm; pitch, 1.0, 2.0, or 3.0) and multiple detector-row (four-channel) helical CT (detector width, 1.25, 2.5, 3.75, and 5 mm; pitch, 0.75 or 1.5). The SD of radius measurements along the rod (SDr) was used to quantify artifacts in all 72 data sets and to analyze their frequency patterns. Volume-rendered images of the data sets were ranked by six independent and blinded readers; findings were correlated with acquisition parameters and SDrmeasurements.RESULTS:SDrwas smaller in four- than in single-channel helical CT for any given table increment (TI). In single-channel helical CT, SDrincreased linearly with beam width and geometrically with pitch. In four-channel helical CT, SDrmeasurements were directly proportional to the TI, regardless of the detector width and pitch combination used. Off-center object position on average increased SDrby a factor of 1.6 for single-channel helical CT and by a factor of 2.0 for four-channel helical CT. Subjective rankings of image quality correlated excellently with SDr(Spearmanr= 0.94,P< .001).CONCLUSION:Artifacts are quantitatively and subjectively smaller with four- compared with single-channel helical CT for any given TI.
体积数据的体积分析：实现范式转变。
影响因子：
19.7
作者：
G. Rubin;S. Napel;A. Leung
通讯作者：
A. Leung
影响因子：
3.8
作者：
Paik, DS;Beaulieu, CF;Napel, S
通讯作者：
Napel, S
影响因子：
19.7
作者：
Rubin, GD;Shiau, MC;Sofilos, MC
通讯作者：
Sofilos, MC