Mortimer-Roberts Hywel, Rees Michael R
North Wales Cardiac Centre, Betsi Cadwaladr University Health Board, Sarn Lan, United Kingdom.
BJR Open. 2020 Apr 21;2(1):20190044. doi: 10.1259/bjro.20190044. eCollection 2020.
To determine whether the use of display matrix magnification on larger operator screens without the use of conventional magnification can reduce radiation dose to the patient, and what effect it would have on image quality.
The kerma-area product (KAP) resulting from standard projections in cardiac angiography were measured when an anthropomorphic phantom was imaged using conventional magnification method and display matrix magnification. The image quality was also evaluated by three observers using a TOR 18FG test tool for both magnification method.
The mean radiation KAP for the seven views with conventional magnification was 36.65 µGy m whilst a reduction in KAP of 20.4% is possible using display matrix magnification ( < 0.05). The image resolution during acquisition was identical between both methods and only slightly reduced for the display matrix (1.6 LP mm) compared to conventional magnification (1.8 LP mm) when images were stored and retrieved on a Picture Archiving and Communication Systems (PACS) system. Both methods retained the same low-contrast detectability to PACS, with only a slight increase in detectability of 18 for display matrix magnification compared to 17 for conventional.
Using display matrix magnification instead of conventional equipment magnification significantly reduces radiation does in all standard cardiac views without reducing image quality for the operator. This reduction in radiation dose is significant ( < 0.05) for the patients. The resolution did not change during acquisition, but contrast improved slightly (0.9% threshold contrast), but lost resolution of 0.2 LP mm when archived to PACS.
This is a new method of reducing significant dose to the patient during cardiology examinations and may encourage further studies in other fluoroscopy lead examination to see if it could work for them.
确定在不使用传统放大功能的情况下，在较大的操作屏幕上使用显示矩阵放大功能是否可以减少患者所接受的辐射剂量，以及这会对图像质量产生何种影响。
使用传统放大方法和显示矩阵放大功能对一个仿真人体模型进行成像时，测量心脏血管造影标准投影所产生的比释动能面积乘积（KAP）。三位观察者还使用TOR 18FG测试工具对两种放大方法的图像质量进行了评估。
采用传统放大功能时七个视图的平均辐射KAP为36.65µGy m，而使用显示矩阵放大功能可使KAP降低20.4%（P<0.05）。两种方法在采集过程中的图像分辨率相同，当图像在图像存档与通信系统（PACS）上存储和检索时，与传统放大功能（1.8 LP mm）相比，显示矩阵放大功能的图像分辨率仅略有降低（1.6 LP mm）。两种方法对PACS的低对比度可探测性保持相同，与传统放大功能的可探测性为17相比，显示矩阵放大功能的可探测性仅略有增加，为18。
使用显示矩阵放大功能而非传统设备放大功能可在不降低操作者图像质量的情况下，显著降低所有标准心脏视图中的辐射剂量。这种辐射剂量的降低对患者而言具有显著意义（P < 0.05）。采集过程中分辨率未发生变化，但对比度略有提高（阈值对比度提高0.9%），但存档到PACS时分辨率损失了0.2 LP mm。
这是一种在心脏病检查期间减少患者所接受显著剂量的新方法，可能会促使在其他荧光透视铅板检查中开展进一步研究，以确定其是否适用于这些检查。
