NYU Langone Health, Department of Radiology, New York, NY, 10016, United States.
Siemens Healthineers, 40 Liberty Blvd, Malvern, PA, 19355, United States.
Eur J Radiol. 2021 Mar;136:109537. doi: 10.1016/j.ejrad.2021.109537. Epub 2021 Jan 12.
To compare CT isocenter accuracy, patient dose, and scan time in adults imaged with and without use of a 3D camera.
571 CT examinations utilizing a 3D camera for initial patient positioning (optional radiographer isocenter adjustment) and 504 examinations scanned without the camera between 10/1/2018 and 3/19/2019 were retrospectively identified. All exams were chest or abdominopelvic CTs. The isocenters of these exams were compared with the true isocenters defined as the manually delineated centroid of the body in the CT volume. The size specific dose estimate (SSDE) (mGy) of radiation dose obtained from departmental software for the 4 most common protocols on one CT scanner was compared before and after implementation of the 3D camera. The times required for the entire scan and just the topogram "scout" were compared with and without the 3D camera for noncontrast chest and abdominopelvic CT enterography protocols. 2-tailed t-tests and Mann-Whitney U tests were used (P < 0.05 indicated statistical significance).
The deviation from true isocenter was 6.8 ± 6.1 mm (P = 0.043) and 16.3 ± 14.0 mm (P < 0.01) with and without the 3D camera, respectively (P < 0.01). CT radiographers accepted isocenter location without alteration in 93 % of examinations. Average SSDE savings with the 3D camera ranged 1.0-2.4 mGy (21-31 %) for the 4 most commonly performed protocols (p < 0.01). Median scout time savings was 32 s (Camera vs. No-Camera cohorts) (P < 0.01). Average noncontrast chest CT and CT enterography scan time savings were 19 s and 17 s with the 3D camera, respectively (P < 0.01).
The 3D camera improved accuracy of patient positioning while reducing radiation dose and examination time. Implementation of a 3D camera helps standardize workflow in a busy clinical practice.
比较使用和不使用 3D 相机的成人 CT 等中心精度、患者剂量和扫描时间。
回顾性识别了 2018 年 10 月 1 日至 2019 年 3 月 19 日期间使用 3D 相机进行初始患者定位（可选放射技师等中心调整）的 571 次 CT 检查和不使用相机扫描的 504 次 CT 检查。所有检查均为胸部或腹部盆腔 CT。这些检查的等中心与真实等中心进行了比较，真实等中心定义为 CT 容积中身体的手动描绘质心。使用一台 CT 扫描仪上的部门软件比较了在实施 3D 相机前后，四种最常见方案的特定剂量估计（SSDE）（mGy）的辐射剂量。比较了非对比性胸部和腹部盆腔 CT 肠造影术方案有无 3D 相机时，整个扫描和仅顶层扫描（“定位”）所需的时间。使用双尾 t 检验和曼-惠特尼 U 检验（P<0.05 表示具有统计学意义）。
有无 3D 相机时，与真实等中心的偏差分别为 6.8±6.1mm（P=0.043）和 16.3±14.0mm（P<0.01）（P<0.01）。CT 放射技师在 93%的检查中接受不改变等中心位置。使用 3D 相机时，四种最常执行的方案的平均 SSDE 节省范围为 1.0-2.4mGy（21-31%）（P<0.01）。定位扫描时间中位数节省 32s（带相机与不带相机队列）（P<0.01）。使用 3D 相机时，非对比性胸部 CT 和 CT 肠造影术的平均扫描时间分别节省 19s 和 17s（P<0.01）。
3D 相机提高了患者定位的准确性，同时降低了辐射剂量和检查时间。在繁忙的临床实践中实施 3D 相机有助于标准化工作流程。
