Evaluation of ultrasound-based prostate localization for image-guided radiotherapy
Evaluation of ultrasound-based prostate localization for image-guided radiotherapy
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DOI：
10.1016/s0360-3016(03)00633-3
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发表时间：
2003-11-01
影响因子：
7
通讯作者：
Roach, M
中科院分区：
文献类型：
--
作者：
Langen, KM;Pouliot, J;Roach, M
目的：评价基于超声的BAT系统在日常前列腺对准中的应用。材料和方法：使用BAT系统进行前列腺对准与使用植入透射线标记物的x线图像进行前列腺对准进行比较。后一种排列被用作参考。BAT和标记对齐之间的差异表示如果使用超声检查进行对齐，将保留的位移。评估了轮廓对准过程的用户间可变性。结果：在标记物比对的基础上，前列腺在上、下、外侧方向的初始位移分别为-0.9 +/- 3.9 mm、0.1 +/- 3.9 mm和0.2 +/- 3.4 mm。BAT与标记比对在各自方向上的定向差异分别为0.2 +/- 3.7、2.7 +/- 3.9和1.6 +/- 3.1 mm。使用BAT系统后，在AP方向发生的位移为2:5 mm的情况减少了2倍。在8名使用者中，由于轮廓线排列变化导致的沙发移动的平均范围分别在前后（AP）、上下和外侧方向为7、7和5毫米。结论：在我们的研究中，BAT定位在上、下、外侧方向上与标记定位有系统的不同。超声定位后前列腺位置的剩余随机变异性与初始变异性相似。然而，在AP方向上，位移2:5 mm的发生减少了。轮廓对准过程的用户间差异显著。(C) 2003 Elsevier Inc.
Purpose: To evaluate the use of the ultrasound-based BAT system for daily prostate alignment.Materials and Methods: Prostate alignments using the BAT system were compared with alignments using radiographic images of implanted radiopaque markers. The latter alignments were used as a reference. The difference between the BAT and marker alignments represents the displacements that would remain if the alignments were done using ultrasonography. The inter-user variability of the contour alignment process was assessed.Results: On the basis of the marker alignments, the initial displacement of the prostate in the AP, superoinferior, and lateral direction was -0.9 +/- 3.9, 0.1 +/- 3.9, and 0.2 +/- 3.4 mm respectively. The directed differences between the BAT and marker alignments in the respective directions were 0.2 +/- 3.7, 2.7 +/- 3.9, and 1.6 +/- 3.1 mm. The occurrence of displacements 2:5 mm was reduced by a factor of two in the AP direction after the BAT system was used. Among eight users, the average range of couch shifts due to contour alignment variability was 7, 7, and 5 mm in the antero-posterior (AP), superoinferior, and lateral direction, respectively.Conclusion: In our study, the BAT alignments were systematically different from the marker alignments in the superoinferior, and lateral directions. The remaining random variability of the prostate position after the ultrasound-based alignment was similar to the initial variability. However, the occurrence of displacements 2:5 mm was reduced in the AP direction. The inter-user variation of the contour alignment process was significant. (C) 2003 Elsevier Inc.