肾囊肿在CT衰减上因束硬化效应出现伪强化。
Renal cyst pseudoenhancement with beam hardening effect on CT attenuation.
作者信息
Gokan Takehiko, Ohgiya Yoshimitsu, Munechika Hirotsugu, Nobusawa Hiroshi, Hirose Masanori
机构信息
Department of Radiology, Showa University School of Medicine, Tokyo, Japan.
出版信息
Radiat Med. 2002 Jul-Aug;20(4):187-90.
PURPOSE
The purpose of this study was to evaluate the extent of pseudoenhancement in a phantom model using three different CT scanners.
METHODS
The phantom consisted of a water-filled balloon (cyst) suspended in varying concentrations of iodine solution, meant to simulate varying levels of renal enhancement. The phantom was scanned with single detector-row CT scanners of three different manufacturers. All scans were performed at 120 kV and 200 mA with 5 mm collimation.
RESULTS
The degree of pseudoenhancement differed among the three scanners. In two of the scanners, the attenuation of water in the balloon (cyst) was noted to increase significantly as the iodine concentration in the cylinder was increased. However, the degree of pseudoenhancement was different between the two scanners. In the other scanner, attenuation of the cyst was noted to decrease as the iodine concentration in the cylinder decreased and to increase as the iodine concentration in the cylinder increased.
CONCLUSION
The degree of pseudoenhancement may vary in scanners of different manufacturers. We may need to check the pattern and degree of pseudoenhancement in CT scanners before determining the enhancement threshold for simple renal cyst.
目的
本研究的目的是使用三种不同的CT扫描仪评估体模模型中的伪强化程度。
方法
体模由一个悬浮在不同浓度碘溶液中的充水气球（囊肿）组成，旨在模拟不同程度的肾脏强化。使用三个不同制造商的单排探测器CT扫描仪对体模进行扫描。所有扫描均在120 kV和200 mA下进行，准直为5 mm。
结果
三种扫描仪的伪强化程度不同。在其中两台扫描仪中，随着圆柱体中碘浓度的增加，气球（囊肿）内水的衰减显著增加。然而，这两台扫描仪之间的伪强化程度不同。在另一台扫描仪中，随着圆柱体中碘浓度的降低，囊肿的衰减降低，而随着圆柱体中碘浓度的增加，囊肿的衰减增加。
结论
不同制造商的扫描仪中伪强化程度可能不同。在确定单纯性肾囊肿的强化阈值之前，我们可能需要检查CT扫描仪中伪强化的模式和程度。
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