UNASSIGNED:分析深吸气屏气(DIBH)是否对需要辅助放疗的左乳腺癌患者的放疗计划技术有剂量学上的益处。
UNASSIGNED:对于左乳腺癌需要辅助放疗的患者,在自由呼吸(FB)和深吸气屏气(DIBH)中进行计划CT扫描。注册后,三种放射治疗计划-3D适形放射治疗(3DCRT),强度调制RT(IMRT),和体积调制电弧治疗(VMAT)-为每位患者的FB和DIBH扫描生成。从剂量-体积直方图收集剂量-体积参数并进行分析。采用配对t检验对各参数进行统计分析。
UNASSIGNED:该研究对13名患者进行。DIBH使左肺的平均剂量减少了32%,24%,和6%(8.6Gy,6.6Gy,和6.4Gy)与3DCRT,IMRT,和VMAT,分别。平均心脏剂量减少了3.3Gy(2.2对5.5Gy),2.2Gy(7.5对9.7Gy),和1.2Gy(5.8对7Gy),3DCRT,IMRT,和DIBH的VMAT。同样,左前降支(LAD)平均剂量相对减少了80%,34%,与3DCRT的FB扫描相比,20%,IMRT,和VMAT分别,3DCRT计划中的最大剂量。
未经评估:DIBH似乎在为考虑进行3DCRT的患者实现更好的保护处于危险中的器官方面具有最大的益处,甚至在较小程度上使用IMRT和VMAT技术。
UNASSIGNED: To analyze whether deep inspiratory breath hold (DIBH) would be dosimetrically beneficial irrespective of radiotherapy planning techniques for patients with left breast cancers requiring adjuvant radiotherapy.
UNASSIGNED: Planning CT scans were taken in free-breathing (FB) as well as deep-inspiration breath hold (DIBH) for patients requiring adjuvant radiotherapy for left breast cancers. After registration, three radiotherapy plans - 3D-conformal radiotherapy (3DCRT), intensity modulated RT (IMRT), and volumetric modulated arc-therapy (VMAT) - were generated for both FB and DIBH scans for each patient. The dose-volume parameters were collected from the dose-volume histogram and analyzed. A paired t-test is used for statistical analysis of the parameters.
UNASSIGNED: The study was conducted on thirteen patients. The mean dose of the left lung was reduced with DIBH by 32%, 24%, and 6% (8.6 Gy, 6.6 Gy, and 6.4 Gy) with 3DCRT, IMRT, and VMAT, respectively. The mean heart dose was reduced by 3.3 Gy (2.2 vs 5.5 Gy), 2.2 Gy (7.5 vs 9.7 Gy), and 1.2 Gy (5.8 vs 7 Gy) with 3DCRT, IMRT, and VMAT with DIBH. Similarly, the left anterior descending artery (
LAD) mean dose was relatively reduced by 80%, 34%, and 20% when compared with the FB scans for 3DCRT, IMRT, and VMAT respectively, with max dose in the 3DCRT plan.
UNASSIGNED: DIBH appears to have maximum benefit in achieving a better sparing of organs-at-risk for patients being considered for 3DCRT, and to a lesser extent with even IMRT and VMAT techniques.