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C-1080 - The optimal tube voltage using a bowtie-filter at pediatric CT examination

T. Oku1, T. Masuda1, N. Imada1, Y. Matsumoto1, y. yamashita2, T. Satou1; 1 Hiroshima/JP 2 hiroshima/JP Type: Scientific Exhibit
Area of Interests: Radioprotection / Radiation dose, Pediatric
Imaging Technique: CT
Procedures: Comparative studies, Dosimetry
Special Focus: Dosimetric comparison
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Aims and objectives: Pediatric CT examination plays an important role in establishing the diagnosis, interventional management for pediatric patients. However, the most serious drawback of CT is radiation exposure which links to an increased risk of cancer 1-4). Especially for children who are more susceptible to radiat[...]

Methods and materials: CT Scanning All CT scans were performed on a 64-detector row CT scanner (Lightspeed VCT; GE Healthcare, Milwaukee, Wisconsin). The scanning parameters were as follows: scan mode, helical scan; beam width, 20.0 mm; section thickness, 0.625 mm; pitch factor, 0.531 mm/rotation; gantry rotation time, 1.[...]

Results: The radiation dose with the 80kVp was 4.95, 4.37, 2.96, 1.54, 0.92, 0.59, 0.51mGy from ISO- to off-center every 3cm, respectively. The radiation dose with the 100kVp was 4.10, 3.67, 2.58, 1.43, 0.89, 0.59, 0.51mGy from ISO- to off-center every 3cm, respectively. The radiation dose with the 120kVp wa[...]

Conclusion: As we know, using lower tube voltage, it is necessary to select the optimal beam shaping filter. Our results show that the radiation dose at 80 kVp was significantly higher than at 100 kVp, 120 kVp, and 140 kVp. We there fore assure that it is necessary to check the beam shaping filter for the pedia[...]

Personal information: Takayuki Oku, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan Takanori Masuda, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan Naoyuki Imada, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan Yoriaki Matsumoto, radiological technolog[...]

References: [1]     Tsai IC, Chen MC, Jan SL, Wang CC, Fu YC, Lin PC, et al. Neonatal cardiac multidetector row CT: Why and how we do it. Pediatr Radiol. 2008;38:438-51. [2]       Kalra MK, Maher MM, Toth TL, Hamberg LM, Blake MA, Shepard JA, et al. Strategies for CT[...]

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