Dose and image quality of electron-beam CT compared with spiral CT.
Dose and image quality of electron-beam CT compared with spiral CT.
复制标题
电子束CT与螺旋CT的剂量和图像质量比较。
作者：
Gerald Weisser;Lehmann Kj;Roland J. Scheck;Eva Coppenrath;Max Georgi
理论基础和目标
目的：比较电子束CT(EBCT)连续容积扫描与螺旋CT的剂量和图像质量。
方法
将EBCT扫描仪与螺旋CT(SCT)扫描仪进行比较。使用三个模体测量低对比度分辨率、高对比度分辨率、切片宽度和剂量。
结果
EBCT扫描显示，在大多数设置下，高对比度分辨率降低了30%。该剂量与螺旋CT 3 mm准直的剂量相当，EBCT 1.5 mm/6 mm准直的剂量比螺旋CT高76%/106%。低对比度分辨率与使用3 mm准直的螺旋CT相当，1.5 mm的分辨率略差，而6 mm EBCT的低对比度分辨率较差(剂量增加4倍才能达到可比的对比度噪声比)。
结论
使用EBCT和连续的容积扫描发现了显著的限制。作者发现，与螺旋CT相比，3 mm准直可以获得可接受的高对比度分辨率和良好的低对比度分辨率。6 mm或1.5 mm准直的使用需要限制在特定情况下。
RATIONALE AND OBJECTIVES
To examine dose and image quality of electron-beam CT (EBCT) with continuous volume scan versus spiral CT.
METHODS
An EBCT scanner was compared with a spiral CT (SCT) scanner. Three phantoms were used to measure low-contrast resolution, high-contrast resolution, slice width, and dose.
RESULTS
The EBCT scans showed 30% lower high-contrast resolution for most settings. The dose was comparable to that of spiral CT with 3 mm collimation and 76%/106% higher with EBCT for 1.5 mm/6 mm collimation. Low-contrast resolution was comparable to that of spiral CT using 3 mm collimation, slightly worse for 1.5 mm, and bad for 6 mm EBCT collimation (four times higher dose to reach comparable contrast-to-noise ratio).
CONCLUSIONS
Significant restrictions were found using EBCT with continuous volume scan. The authors found that 3 mm collimation can yield acceptable high-contrast resolution and good low-contrast resolution compared with spiral CT. The use of 6 mm or 1.5 mm collimation needs to be restricted to selected cases.