Kelly W M, Gould R, Norman D, Brant-Zawadzki M, Cox L
AJR Am J Roentgenol. 1984 Oct;143(4):857-60. doi: 10.2214/ajr.143.4.857.
An electrocardiogram (ECG)-synchronized x-ray exposure sequence was used to acquire digital subtraction angiographic (DSA) images during 13 arterial injection studies of the aortic arch or carotid bifurcations. These "gated" images were compared with matched "ungated" DSA images acquired using the same technical factors, contrast material volume, and patient positioning. Subjective assessments by five experienced observers of edge definition, vessel conspicuousness, and overall diagnostic quality showed overall preference for one of the two acquisition methods in 69% of cases studied. Of these, the ECG-synchronized exposure series were rated superior in 76%. Linear intensity gradients across vessel margins generally showed improved or unchanged edge definition in the gated subtraction images as compared with their ungated pairs. These results, as well as the relatively simple and inexpensive modifications required, suggest that routine use of ECG exposure control can facilitate improved arterial DSA evaluations of suspected cervicothoracic vascular disease.
在对主动脉弓或颈动脉分叉进行的13项动脉注射研究中，采用了心电图（ECG）同步的X射线曝光序列来获取数字减影血管造影（DSA）图像。将这些“门控”图像与使用相同技术参数、造影剂用量和患者体位获取的匹配“非门控”DSA图像进行比较。5名经验丰富的观察者对边缘清晰度、血管显影度和整体诊断质量进行主观评估，结果显示，在69%的研究病例中，对两种采集方法中的一种有总体偏好。其中，76%的病例认为ECG同步曝光系列更优。与非门控图像对相比，门控减影图像中血管边缘的线性强度梯度通常显示边缘清晰度有所改善或保持不变。这些结果以及所需的相对简单且成本低廉的改进措施表明，常规使用ECG曝光控制有助于改善对疑似颈胸段血管疾病的动脉DSA评估。
