Shinohara Fuminori, Ishikawa Mitsuo, Miyazaki Shigeru, Ide Toshinori, Asano Hiroshi, Tsukamoto Atsuko, Imai Yoshio, Okuaki Tomoyuki, Tanigoshi Masayuki, Abe Shinji, Ogura Izumi, Negishi Toru
Department of Radiology, Nippon Medical School Second Hospital, Japan.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2002 Apr;58(4):479-86. doi: 10.6009/jjrt.kj00001364384.
The X-ray systems study group used the Victoreen NERO mAx model 8000, a new non-invasive X-ray output analyzer, to measure the tube voltage, tube voltage waveform, tube current, and irradiation time for conditions corresponding to general radiography and mammography. The measurement results were then compared with those obtained using a conventional invasive measuring instrument. The peak values of the tube voltage measured by the NERO mAx and the invasive measuring instrument were compared. The NERO mAx had a good measurement error range of -1.2 to +0.9 kV. For tube current measurement by the NERO mAx, the maximum error for general radiography conditions was +11 mA and that for mammography conditions was +6 mA. For irradiation time measurement, the value for general radiography conditions was slightly greater and the value for mammography conditions was slightly less than the corresponding values obtained by the invasive measuring instrument. If radiation quality is changed during measurement of the characteristics, measurement values change. Since the NERO mAx incorporates two types of X-ray detectors, it shows good measurement reproducibility. The NERO mAx has been shown to have suitable characteristics for use as a measuring instrument for constancy tests. In the future, constancy tests should be used to quantitatively control the factors determining clinical image quality.
X射线系统研究小组使用了Victoreen NERO mAx 8000型新型非侵入式X射线输出分析仪，来测量对应于普通放射摄影和乳腺摄影条件下的管电压、管电压波形、管电流和照射时间。然后将测量结果与使用传统侵入式测量仪器获得的结果进行比较。比较了NERO mAx和侵入式测量仪器测量的管电压峰值。NERO mAx的测量误差范围在-1.2至+0.9 kV之间，表现良好。对于NERO mAx测量管电流，普通放射摄影条件下的最大误差为+11 mA，乳腺摄影条件下为+6 mA。对于照射时间测量，普通放射摄影条件下的值略大于侵入式测量仪器获得的相应值，乳腺摄影条件下的值略小于该值。如果在特性测量过程中改变辐射质量，测量值会发生变化。由于NERO mAx集成了两种类型的X射线探测器，因此具有良好的测量再现性。NERO mAx已被证明具有适合用作稳定性测试测量仪器的特性。未来，应使用稳定性测试来定量控制决定临床图像质量的因素。
