With the improvement of image processing technology of dual-energy CT (DECT), many kinds of DECT images are available. [1-5] Utilized the benefit of the DECT, brain DECT are greater used in case of the emergency. [6-7] The third-generation dual source CT utilized 150 KV with 0.6 mm tin (Sn) filter pairing to increase energy separation in dual-energy scanning. [8-9] With the increasing emergent brain DECT examinations, the occupational radiation exposure greatly increased in caregiver of medical staff (see table.1). We evaluated the radiation protective effects...

Scatter X-rays Measurements:The Scatter Radiation measurements were performed with single-energy (SE) and dual-energy (DE) head CT scans using the third generation dual-source CT (SOMATOM Force, SIEMENS Healthineer, Erlangen, Germany). The anthropomorphic phantom (Model RAN-110, Phantom Laboratory, Salem, USA) placed on the CT table. A solid-state detector (SSD) survey meter (X2 Survey Sensor, Unfors RaySafe, Billdal, Sweden) and an ion chamber (IC: 10X6-180, Radcal, Monrovia, USA) placed at caregiver standing position nearby both side of CT gantry (see fig.2). The SE and DE head CT scans...

Scatter X-rays dosimetry: The air kerma of scatter X-rays which measured by ion chamber and solid-state survey meter were 0.18 mGy both SE and DE scan, respectively (see fig.6 upper). Effective Energy of Scatter X-rays dosimetry: The effective energy of scatter X-rays which measured by solid state survey meter were 59, 65 keV both SE and DE scan, respectively (see fig.6 lower). Penetration Measured with lead and non-lead aprons: Fig.7 shows the relativepercent penetration value with SE scan as a percentage of the incident beam...

The effective energy of scatter X-rays were 59 KeV with SE scan and 65 KeV with DE scan. The scatter X-rays of DE scan had been significant higher effective energy. Because of the significant higher effective energy of scatter X-rays with DE scan, the percent penetration of scatter X-rays through the aprons were increased than SE scan. The DE scan with dual-source CT generates scattered X-rays which have higher effective energy than those from single-energy scan because it uses tin (Sn) filtration to the high...

Y. Takei; Kurashiki/JP - nothing to disclose S. Suzuki; Nagoya, Aichi/JP - nothing to disclose A. Hirosawa; Takaoka/JP - nothing to disclose M. Hashimoto; Kobe/JP - nothing to disclose H. Ueno; Takaoka/JP - nothing to disclose K. Matsubara; Kanazawa/JP - nothing to disclose I. Kobayashi; Tsukuba, Ibaraki/JP - nothing to disclose H. Itoh; Toyama/JP - nothing to disclose S. Ishizaki; Toyama/JP - nothing to disclose

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