Yamamoto Keiichi, Miyazaki Shigeru, Asano Hiroshi, Shinohara Fuminori, Ishikawa Mitsuo, Ide Toshinori, Abe Shinji, Negishi Toru, Miyake Hiroyuki, Imai Yoshio, Okuaki Tomoyuki
Department of Radiology, Ida Municipal Hospital, Kawasaki City.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2003 Jul;59(7):857-63. doi: 10.6009/jjrt.kj00003174215.
Our X-ray systems study group measured and examined the characteristics of four transportable inverter-type X-ray equipments. X-ray tube voltage and X-ray tube current were measured with the X-ray tube voltage and the X-ray tube current measurement terminals provided with the equipment. X-ray tube voltage, irradiation time, and dose were measured with a non-invasive X-ray tube voltage-measuring device, and X-ray output was measured by fluorescence meter. The items investigated were the reproducibility and linearity of X-ray output, error of pre-set X-ray tube voltage and X-ray tube current, and X-ray tube voltage ripple percentage. The waveforms of X-ray tube voltage, the X-ray tube current, and fluorescence intensity draw were analyzed using the oscilloscope gram and a personal computer. All of the equipment had a preset error of X-ray tube voltage and X-ray tube current that met JIS standards. The X-ray tube voltage ripple percentage of each equipment conformed to the tendency to decrease when X-ray tube voltage increased. Although the X-ray output reproducibility of system A exceeded the JIS standard, the other systems were within the JIS standard. Equipment A required 40 ms for X-ray tube current to reach the target value, and there was some X-ray output loss because of a trough in X-ray tube current. Owing to the influence of the ripple in X-ray tube current, the strength of the fluorescence waveform rippled in equipments B and C. Waveform analysis could not be done by aliasing of the recording device in equipment D. The maximum X-ray tube current of transportable inverter-type X-ray equipment is as low as 10-20 mA, and the irradiation time of chest X-ray photography exceeds 0.1 sec. However, improvement of the radiophotographic technique is required for patients who cannot move their bodies or halt respiration. It is necessary to make the irradiation time of the equipments shorter for remote medical treatment.
我们的X射线系统研究小组对四台便携式逆变式X射线设备的特性进行了测量和检测。利用设备配备的X射线管电压和X射线管电流测量端子测量X射线管电压和X射线管电流。使用无创X射线管电压测量装置测量X射线管电压、照射时间和剂量，并用荧光计测量X射线输出。研究的项目包括X射线输出的再现性和线性、预设X射线管电压和X射线管电流的误差以及X射线管电压纹波百分比。使用示波器和个人计算机分析X射线管电压、X射线管电流和荧光强度图的波形。所有设备的X射线管电压和X射线管电流预设误差均符合JIS标准。各设备的X射线管电压纹波百分比符合X射线管电压升高时下降的趋势。虽然系统A的X射线输出再现性超过了JIS标准，但其他系统在JIS标准范围内。设备A的X射线管电流达到目标值需要40毫秒，并且由于X射线管电流的低谷导致了一些X射线输出损失。由于X射线管电流纹波的影响，设备B和C中的荧光波形强度出现波动。设备D中记录装置的混叠导致无法进行波形分析。便携式逆变式X射线设备的最大X射线管电流低至10 - 20毫安，胸部X射线摄影的照射时间超过0.1秒。然而，对于无法移动身体或停止呼吸的患者，需要改进放射摄影技术。对于远程医疗，有必要缩短设备的照射时间。
