穿透式 OLED 显示器：用于兆伏级放射治疗的 OLED AVATAR 屏幕的剂量测定与性能
Treat-through OLED Displays: Dosimetry and performance of OLED AVATAR screens for Megavoltage Radiotherapy
AI总结：
本研究评估了用于儿科放射治疗中安抚患者的 OLED AVATAR 屏幕的剂量扰动与性能，发现其对兆伏级弧形治疗的靶区剂量影响极小，适用于临床，但在低能光子或粒子束中需谨慎。
摘要：
AVATAR 系统利用一种射线可透视频显示器，在放射治疗期间帮助儿科患者放松并实现固定。本研究探讨了 OLED（有机发光二极管）显示器的使用，与传统的基于投影仪的系统相比，它提供了更卓越的图像质量和更快的对准速度，尽管其厚度略有增加。评估了这些屏幕引起的剂量扰动，以评估其用于放射治疗的适用性。将一块 20 cm 的 OLED 屏幕放置在患者的视线内，即患者头部与辐射源之间。该屏幕包含一块 0.25 mm 厚的柔性 OLED 面板和一个定制的碳纤维背板（厚度为 0.3 至 0.6 mm），大部分电子元件通过排线进行了移位处理。在有屏和无屏条件下捕获了 6 MV 射野图像以生成透射图。此外，在固体水模体的表面及不同深度处进行了平行板电离室测量。OLED 的辐射耐受性通过 100 Gy 的剂量照射以及在活跃的放射治疗直线加速器机房中 12 个月的实际使用进行了测试。射野图像透射图表明，有和无 AVATAR 屏幕的测量结果之间平均衰减差异为 0.3%（SD = 0.37%），最大点衰减为 3%。电离室测量显示，在前后向（anterior-posterior）射线束下，2 cm 深度处的剂量降低了 0.31%，而表面剂量增加了 7.04%。对于 VMAT 弧形照射，2 cm 深度处的剂量差异为 0.04%，模体表面为 0.1%。极小的剂量偏差表明，这些屏幕适用于兆伏级弧形治疗，且不会显著影响靶区剂量。虽然静态前向射线束的表面剂量略有增加，但仍保持在较低水平。对于较低的光子能量或粒子束，可能会产生更大的扰动，因此需要进一步的测量或避开射线入射方向。
英文摘要：
The AVATAR system utilizes a radiolucent video display to help relax and immobilize pediatric patients during radiotherapy. This study investigates the use of OLED (Organic Light Emitting Diode) displays, which offer superior image quality and faster alignment compared to traditional projector-based systems, albeit with slightly increased thickness. The dose perturbations caused by these screens were assessed to evaluate their suitability for radiotherapy. A 20 cm OLED screen was positioned in the patient's line of sight, between the patient's head and the radiation source. The screen comprises a 0.25 mm thick flexible OLED panel and a custom carbon fiber backing (0.3 to 0.6 mm thick), with most electronic components relocated via ribbon cable. 6 MV portal images were captured with and without the screen to create transmission maps. Additionally, parallel plate ion chamber measurements were taken at the surface and at depth in a solid water phantom. The OLED's radiation tolerance was tested with a 100 Gy dose delivery and 12 months of use in an active radiotherapy linac vault. The portal image transmission maps indicated an average attenuation difference of 0.3\% (SD = 0.37 \%) between measurements with and without the AVATAR screen, with a maximum point attenuation of 3\%. Ion chamber measurements revealed a 0.31\% decrease in dose at 2 cm depth and a 7.04 \% increase at the surface under an anterior-posterior beam. For a VMAT arc, the dose difference was 0.04 \% at 2 cm depth and 0.1\% at the phantom surface. The minimal dose deviations indicate that these screens are suitable for megavoltage arc therapy without significantly affecting the target dose. While surface dose is slightly increased for static anterior beams, it remains low. For lower photon energies or particle beams, larger perturbations may occur, necessitating further measurements or beam entry avoidance.
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