Golbus Alexa E, Schuzer John L, Steveson Chloe, Rollison Shirley F, Matthews James, Henry-Ellis Joseph, Razeto Marco, Chen Marcus Y
Cardiovascular Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
Canon Medical Research USA, Vernon Hills, IL, USA.
Eur J Radiol Open. 2024 Jun 19;13:100578. doi: 10.1016/j.ejro.2024.100578. eCollection 2024 Dec.
Traditional CT acquisition planning is based on scout projection images from planar anterior-posterior and lateral projections where the radiographer estimates organ locations. Alternatively, a new scout method utilizing ultra-low dose helical CT (3D Landmark Scan) offers cross-sectional imaging to identify anatomic structures in conjunction with artificial intelligence based Anatomic Landmark Detection (ALD) for automatic CT acquisition planning. The purpose of this study is to quantify changes in scan length and radiation dose of CT examinations planned using 3D Landmark Scan and ALD and performed on next generation wide volume CT versus examinations planned using traditional scout methods. We additionally aim to quantify changes in radiation dose reduction of scans planned with 3D Landmark Scan and performed on next generation wide volume CT.
Single-center retrospective analysis of consecutive patients with prior CT scan of the same organ who underwent clinical CT using 3D Landmark Scan and automatic scan planning. Acquisition length and dose-length-product (DLP) were collected. Data was analyzed by paired t-tests.
104 total CT examinations (48.1 % chest, 15.4 % abdomen, 36.5 % chest/abdomen/pelvis) on 61 individual consecutive patients at a single center were retrospectively analyzed. 79.8 % of scans using 3D Landmark Scan had reduction in acquisition length compared to the respective prior acquisition. Median acquisition length using 3D Landmark Scan was 26.7 mm shorter than that using traditional scout methods (p < 0.001) with a 23.3 % median total radiation dose reduction (245.6 (IQR 150.0-400.8) mGy cm vs 320.3 (IQR 184.1-547.9) mGy cm). CT dose index similarly was overall decreased for scans planned with 3D Landmark and ALD and performed on next generation CT versus traditional methods (4.85 (IQR 3.8-7) mGy vs. 6.70 (IQR 4.43-9.18) mGy, respectively, p < 0.001).
Scout imaging using reduced dose 3D Landmark Scan images and Anatomic Landmark Detection reduces acquisition range in chest, abdomen, and chest/abdomen/pelvis CT scans. This technology, in combination with next generation wide volume CT reduces total radiation dose.
传统CT采集规划基于平面前后位和侧位投照的定位像，由放射技师估计器官位置。另一种方法是，一种利用超低剂量螺旋CT的新定位方法（3D地标扫描）提供横断面成像，结合基于人工智能的解剖地标检测（ALD）进行自动CT采集规划。本研究的目的是量化使用3D地标扫描和ALD规划并在新一代宽体CT上进行的CT检查与使用传统定位方法规划的检查相比，扫描长度和辐射剂量的变化。我们还旨在量化使用3D地标扫描规划并在新一代宽体CT上进行的扫描的辐射剂量减少情况。
对同一器官先前进行过CT扫描且使用3D地标扫描和自动扫描规划进行临床CT检查的连续患者进行单中心回顾性分析。收集采集长度和剂量长度乘积（DLP）。数据采用配对t检验进行分析。
对单中心61例连续患者进行的104次CT检查（48.1%为胸部，15.4%为腹部，36.5%为胸部/腹部/骨盆）进行回顾性分析。与各自先前的采集相比，79.8%使用3D地标扫描的扫描采集长度缩短。使用3D地标扫描的中位采集长度比使用传统定位方法短26.7毫米（p<0.001），中位总辐射剂量降低23.3%（245.6（四分位间距150.0 - 400.8）mGy cm对320.3（四分位间距184.1 - 547.9）mGy cm）。与传统方法相比，使用3D地标和ALD规划并在新一代CT上进行的扫描的CT剂量指数同样总体下降（分别为4.85（四分位间距3.8 - 7）mGy对6.70（四分位间距4.43 - 9.18）mGy，p<0.001）。
使用低剂量3D地标扫描图像和解剖地标检测的定位成像可减少胸部、腹部和胸部/腹部/骨盆CT扫描的采集范围。该技术与新一代宽体CT相结合可降低总辐射剂量。
