Bentel G C
Duke University Medical Center, Durham, NC 27710.
Med Dosim. 1990 Mar;15(1):3-6. doi: 10.1016/0958-3947(90)90059-q.
Careful treatment planning and dose calculation, combined with effective positioning and immobilization, may improve the probability of tumor control. Modern radiation therapy equipment has had a significant impact on the accuracy of dose calculation and delivery. However, the problems of patient repositioning and immobilization, which may represent the area of the greatest variance in precise treatment delivery, still need much improvement. On this premise, many site specific repositioning and immobilizing devices have been developed in our institution for radiation therapy. Alpha Cradles have been used for positioning of patients undergoing irradiation for carcinoma of the breast at our institution for several years but did not provide adequate support for the arm. A modification of an Alpha Cradle was developed specifically for breast treatments and is described in this report. The modification, which is easily made, consists of a mold which conforms tightly to the arm and allows minimal variation in repositioning of the arm. A handle, built into the device, offers the patient a comfortable resting place for the hand and also fixes the orientation of the hand during the treatments. This device offers a very comfortable support for the elevated arm and greatly improves the accuracy of repositioning the patient.
精心的治疗计划和剂量计算，结合有效的定位和固定，可能会提高肿瘤控制的概率。现代放射治疗设备对剂量计算和输送的准确性产生了重大影响。然而，患者重新定位和固定的问题，这可能是精确治疗输送中差异最大的领域，仍然需要很大改进。在此前提下，我们机构开发了许多针对特定部位的重新定位和固定装置用于放射治疗。多年来，Alpha托架一直在我们机构用于乳腺癌放疗患者的定位，但对手臂的支撑不足。本报告描述了一种专门为乳腺治疗开发的Alpha托架的改进型。这种改进很容易实现，包括一个紧密贴合手臂的模具，使手臂重新定位时的变化最小。装置上内置的一个把手为患者的手提供了一个舒适的 resting place，并且在治疗期间也固定了手的方向。该装置为抬起的手臂提供了非常舒适的支撑，并大大提高了患者重新定位的准确性。
