Butler W E, Piaggio C M, Constantinou C, Niklason L, Gonzalez R G, Cosgrove G R, Zervas N T
Neurosurgical Service, Massachusetts General Hospital, Boston 02114, USA.
Neurosurgery. 1998 Jun;42(6):1304-10; discussion 1310-1. doi: 10.1097/00006123-199806000-00064.
A mobile computed tomographic scanner has been developed in which the scan plane is selected by means of gantry translation, rather than by translation of the patient table. This permits computed tomographic scanning in situ of any patient who is positioned on a radiolucent surface that fits within the inner diameter of the gantry. We report the design of and initial experience with this scanner as used with adapters for intraoperative and bedside computed tomography (CT).
The scanner is equipped with wheels, draws power from wall outlets (120 V, 20 A) in combination with batteries, and has a translating gantry. Preclinical studies of image quality were performed with phantoms. An operating table adapter was built for use with a radiolucent cranial fixation device. A bedside adapter was built that holds the head and shoulders of a patient in the intensive care unit.
The preclinical phantom studies showed satisfactory image spatial resolution (0.8 mm) and low-contrast resolution signal-to-noise relative standard deviation (0.37%). Experience to date with 12 patients has confirmed the feasibility of intraoperative CT on demand. Experience to date with 26 patients has confirmed the feasibility of routine bedside CT in the intensive care unit.
With these adaptations, mobile CT may increase the efficiency of intraoperative scanning by making it available to multiple operating rooms without committing it to any room for an entire operation and may increase the efficiency and safety of CT of critically ill patients who currently need to leave the intensive care unit to travel to a fixed CT installation and back.
已开发出一种移动计算机断层扫描仪，其扫描平面是通过机架平移来选择的，而非通过患者检查床的平移。这使得能够对位于适合机架内径的透射线表面上的任何患者进行原位计算机断层扫描。我们报告了该扫描仪的设计以及将其与术中及床边计算机断层扫描（CT）适配器配合使用时的初步经验。
该扫描仪配备有轮子，可从墙上插座（120伏，20安）结合电池获取电力，并具有可平移的机架。使用体模进行了图像质量的临床前研究。制作了一个手术台适配器，用于与透射线颅骨固定装置配合使用。制作了一个床边适配器，用于在重症监护病房固定患者的头部和肩部。
临床前体模研究显示出令人满意的图像空间分辨率（0.8毫米）和低对比度分辨率信号噪声相对标准偏差（0.37%）。迄今为止对12例患者的经验证实了按需进行术中CT的可行性。迄今为止对26例患者的经验证实了在重症监护病房进行常规床边CT的可行性。
通过这些改进，移动CT可提高术中扫描的效率，因为它可供多个手术室使用，而无需在整个手术过程中将其固定在任何一个房间，并且可提高目前需要离开重症监护病房前往固定CT设备处再返回的重症患者CT检查的效率和安全性。
