Department of Radiation Oncology, Apollo Multispeciality Hospitals, Kolkata, India.
Department of Physics, GLA University, Mathura, Uttar Pradesh, 281406, India.
Radiol Phys Technol. 2024 Jun;17(2):527-535. doi: 10.1007/s12194-024-00791-0. Epub 2024 Mar 25.
This study analyse setup time (ST) and frequency of on-board imaging for stereotactic abdomen (liver, stomach), lung, and spine radiotherapy in the absence of automatic rotational correction. Total 53 stereotactic body radiotherapy (SBRT) patients, 28 of abdomen, 19 lung, and 6 spine treated for 230 sessions in O-ring gantry accelerator were evaluated for ST analysis. The mean setup time for all patients, abdomen, lung, and spine cases were 7.7 ± 7.4 min, 9.2 ± 9.2 min, 6.3 ± 4.1 min, and 5.5 ± 3.3 min, respectively. Median number CBCT was 2. 96% of cases had a CBCT between 1 and 3, and 9 (4%) had ≥ 4 CBCTs. Overall, 38.1%, 35.5%, 22.1%, 2.2%, and 2.2% of setup time fall into window of 0-5 min, 5-10 min, 10-20 min, 20-30 min, and > 30 min. Most difficult challenge is to negotiate with unknown rotational errors. It will be easy to dealt with them without automatic rotational correction if values are known.
本研究分析了在没有自动旋转校正的情况下，立体定向腹部（肝脏、胃）、肺部和脊柱放疗的摆位时间（ST）和实时成像频率。在 O 型环龙门加速器中对 53 名接受立体定向体部放疗（SBRT）的患者进行了 230 次治疗，评估了 ST 分析。所有患者、腹部、肺部和脊柱病例的平均摆位时间分别为 7.7±7.4 分钟、9.2±9.2 分钟、6.3±4.1 分钟和 5.5±3.3 分钟。中位数 CBCT 数量为 2。1%至 3%的病例有 1 至 3 次 CBCT，9 例（4%）有≥4 次 CBCT。总体而言，38.1%、35.5%、22.1%、2.2%和 2.2%的摆位时间落在 0-5 分钟、5-10 分钟、10-20 分钟、20-30 分钟和>30 分钟的窗口内。最大的挑战是协商未知的旋转误差。如果知道这些值，就可以轻松处理没有自动旋转校正的问题。
