...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Rectal dosimetry following prostate brachytherapy with stranded seeds--comparison of transrectal ultrasound intra-operative planning (day 0) and computed tomography-postplanning (day 1 vs. day 30) with special focus on sources placed close to the rectal wall.
【24h】

Rectal dosimetry following prostate brachytherapy with stranded seeds--comparison of transrectal ultrasound intra-operative planning (day 0) and computed tomography-postplanning (day 1 vs. day 30) with special focus on sources placed close to the rectal wall.

机译：前列腺近距离放射治疗后使用种子植入直肠进行剂量测定-比较经直肠超声术中计划（第0天）和计算机断层摄影后计划（第1天对比第30天），重点放在靠近直肠壁的放射源上。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

BACKGROUND AND PURPOSE: The aim of the study was to compare intra-operative and postplanning at different intervals with special focus on sources placed close to the rectal wall. MATERIALS AND METHODS: In 61 consecutive patients, CT scans were performed on day 1 and day 30 after an I-125 implant with stranded seeds. The number of sources < or =7 mm to the rectal wall was determined, and displacements were analyzed. The angulation of strands relative to rectal wall was compared between intra-operative transrectal ultrasound (TRUS) and both postplanning CT scans. RESULTS: Sources close to the rectum on day 1 (n=204) have been the most apical in a strand in 98.5% (n=201). By comparing day 1 and day 30 data, significant inferior source displacements (mean 3.6 mm; p=0.02) relative to pelvic bones and a decreasing distance to the rectal wall (mean 1.2 mm; p<0.01)--consequentially increasing rectal dose--were determined only for sources initially > or =3 mm to the rectum. In contrast to an almost parallel arrangement of the needle track and the rectal wall in TRUS, strands and rectal wall converged towards the apex in the postplanning CT scans (mean >30 degrees). CONCLUSIONS: Posterior preplanning margins around the prostate should be particularly limited at the level of the prostate apex.
机译：背景与目的：本研究的目的是比较不同间隔的术中和后计划，特别关注靠近直肠壁放置的来源。材料与方法：在连续61例患者中，在I-125植入种子后的第1天和第30天进行CT扫描。确定直肠壁上≤7 mm的放射源数量，并分析位移。比较术中经直肠超声（TRUS）和计划后CT扫描之间的相对于直肠壁的股线角度。结果：第1天（n = 204），靠近直肠的来源是98.5％（n = 201）的最顶端。通过比较第1天和第30天的数据，相对于骨盆骨的明显下位源位移（平均3.6 mm; p = 0.02）和到直肠壁的距离减小（平均1.2 mm; p <0.01）-因此直肠剂量增加- -仅针对最初大于或等于3 mm的直肠源确定。与TRUS中的针迹和直肠壁几乎平行排列相比，在计划后的CT扫描（平均> 30度）中，股线和直肠壁会聚到顶点。结论：前列腺周围的后部预计划边缘应特别限制在前列腺顶点的水平。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号