
SynthRAD2023——放射治疗的CT合成 - 知乎 - 知乎专栏
2023年6月9日 · 计算机断层扫描 (CT) 被认为是 RT 中的主要成像模式,可提供准确和高分辨率的患者几何形状,并实现剂量计算所需的直接电子密度转换。 此外, 锥束计算机断层扫描 (CBCT) 在用于光子和质子治疗的 图像引导自适应放射治疗 (IGART) 中起着至关重要的作用。 然而,由于严重的散射噪声和截断投影,CBCT 受到伪影的影响,例如阴影、条纹和杯状,使其不适合精确的剂量计算。 目前已经提出图像合成以将 CBCT 的质量提高到 CT 水平,产生所谓的“合成 …
TAICHI RT的实时影像引导系统如何确保放疗精度? - 知乎
2024年12月13日 · TAICHI RT通过高精度 kV级锥形束计算机断层扫描成像 (CBCT)模块和 实时数字化验证系统 (EPID),实现了对肿瘤靶区的高精度定位和摆位验证,显著提高了放疗的精度和安全性。 本文将深入探讨TAICHI RT的实时影像引导系统,特别是在实现实时图像引导、监控射野形状和出束剂量变化方面的作用。 在放疗过程中,精准定位和摆位验证是提高治疗效果的关键步骤。 TAICHI RT利用kV-CBCT和EPID在治疗前或治疗过程中实时获取患者体内肿瘤及周围正 …
Routine use of single visit online adaptive CBCT-guided sim-free ...
3 天之前 · Time frame 1 (TF1) consists of entering the RT-room, setup time and the first CBCT. Time Frame 2 (TF2) encompassed contouring time and the generation and optional editing of influencers and target structures. At present, contour editing is frequently carried out by RTTs under the direct supervision of a RO at the treatment machine. Time Frame 3 ...
2V-CBCT: Two-Orthogonal-Projection Based CBCT ... - IEEE Xplore
2024年8月6日 · This work demonstrates the feasibility of two-orthogonal-projection-based CBCT (2V-CBCT) reconstruction and dose calculation for radiation therapy (RT) using re
DICOM-RT:放疗领域中的各种影像 - CSDN博客
2018年4月23日 · 千伏级CBCT,赋予了传统医用直线加速器容积 成像 的功能。 在治疗開始前患者已经处于治疗位置时,进行CBCT图像採集与重建,提供三维和软组织的高分辨率容积成像。 实现更精确的靶区对位。 4. MV-CBCT(包含平片2D、容积3D和实时透视三种影像) 兆伏级CBCT, 直接利用直线加速器作为成像的射线源,对于具有高对照度的组织(诸如骨骼和肺)或含有高原子序数的材质(如假牙或髋关节假体)的成像质量良好。 可是相较于kV-CBCT而言,软组织的 …
放射治疗中CBCT的质控项目和模体 - 知乎 - 知乎专栏
CBCT设备性能模体是专门设计用于CBCT、牙科X线断层摄影和3D成像设备全程的QA/QC测试工具的,应用范围包括3D成像设备和C形臂X射线机等设备,该模体也可用于标准的CT IQ测试。 符合标准: WS818-2023《锥形束X射线计算机体层成像 (CBCT)设备质量控制检测标准》附录G。 主要技术参数: 1、模体主体,由直径为 20cm 的 聚氨酯软胶 圆柱体组成,高度 200mm;里面包含3组模块,一个木箱为固定挂座,模体主体挂在木箱边缘打好平水进行扫描检测. 3组模块. A …
Cone-beam CT-guided radiotherapy in the management of lung …
2015年12月5日 · In this study, we evaluated intrathoracic changes detected by cone-beam CT (CBCT) in lung cancer patients during RT. Methods and materials: A total of 71 lung cancer patients treated with fractionated CBCT-guided RT were evaluated. Intrathoracic changes and plan adaptation priority (AP) scores were compared between small cell lung cancer (SCLC ...
2V-CBCT: Two-Orthogonal-Projection Based CBCT ... - ScienceDirect
2023年10月1日 · Not all radiation therapy (RT) treatments/fractions have CBCT acquired, but two orthogonal projections (i.e., KV radiography) are always available. This work demonstrates the feasibility of two-orthogonal-projection-based CBCT (2V-CBCT) reconstruction and dose calculation for RT from real CBCT projection data, which is the first 2V-CBCT ...
A review of dose calculation approaches with cone beam CT in
Background and purpose: The use of cone beam computed tomography (CBCT) for performing dose calculations in radiation therapy has been widely investigated as it could provide a quantitative analysis of the dosimetric impact of changes in patients during the treatment. The aim of this review was to classify different techniques adopted to ...
Adaptive Radiation Therapy: A Review of CT-based Techniques
CBCT is widely used for image-guided RT, so implementing CBCT-guided online ART requires little infrastructural change or specialized training (24,46). Other advantages include a short image acquisition time (approximately 2 minutes for CBCT acquisition) and ease of delivery (no caveats for metal implants, large patient size, or claustrophobia ...