| LAI Ai-ping,DING Xin-fa,GONG Fang-qi,et al.Optimizing scan parameters to reduce the radiation dose on 16 slices CT examination of children[J].Chinese Journal of Radiological Medicine and Protection,2006,26(2):180-183 |
| Optimizing scan parameters to reduce the radiation dose on 16 slices CT examination of children |
| Received:August 12, 2005 |
| DOI： |
| KeyWords:Dose Children Tomography Scan parameter |
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| Abstract:: |
| Objective To demonstrate the relationship of scan parameters (mAs,kVp) with radiation dose and image noise, then to help to adjust the scanning parameters in reasonable image noise level for imaging children, to formulate appropriate multislice CT scan protocols for pediatric patients on limited radiation dose. Methods The CTDI(computed tomography dose index) was obtained at both 1.0 cm below surface and the center with 16 cm and 32 cm diameter CT dose index phantoms and a standard 100 mm CT pencil ion chamber in the different acquisition parameters (mAs and kVp). The image|noise values in 20 cm water phantom with 2 mm×5 mm thickness were obtained as a standard of image quality. On the basis of noise equivalent CT image, we implemented a pediatric protocol table for daily children CT imaging in order to reduce the radiation dose for pediatric patients. Results The CTDI values were directly proportional to the mAs in same kVp. Higher kVp had higher CTDI. If other technical factors were kept constant, CTDI values on 16 cm phantom was 58% higher than that on 32 cm phantom. The displayed dose in CT scanner was higher than the dose that was actually measured. At constant kVp, the mAs reduced the image noise nonlinearly. Conclusion An acceptable image quality can be achieved for pediatric patients by reducing the scanning technique parameters to 10%|85% to those used for adults. |
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