Abstract Objective To study the CT values of certain phantoms scanned by various CT scanners with dissimilar parameters. Methods The CT values of tissue equivalent inserts was measured in the TM164 and CIRS-062 phantom scanned by TOSHIBA AQUILIONTM, SIEMENS SOMATOMTMSENSATIONTM 64 and SIEMENS SOMATOMTMSENSATIONTM OPEN with different voltages, currents and slice thicknesses and then the corresponding CT-to-density curves was compared. Results There are no significant differences of CT values with various currents and slice thicknesses and also for low atom number materials scanned by different scanners with various tube voltages. The CT values of high atom number materials have obvious differences scanned with tube voltage, the maximum is about 400 HU. There are also significant differences between CT-density curves of two phantoms in the range from soft tissues to dense bone, the maximum is up to 500 HU. Conclusions CT-density curves were highly affected by materials of phantoms, scanners and tube voltages. It is necessary to measure the curve with a comfortable phantom and certain scanner to assure the accuracy for dose calculation for treatment planning system.
FENG Guo-sheng*,LIANG Yuan,WU Dan-ling et al. Impact factor of relationships between CT value and relative electron density for treatment planning system[J]. Chinese Journal of Radiation Oncology, 2012, 21(3): 281-284.
FENG Guo-sheng*,LIANG Yuan,WU Dan-ling et al. Impact factor of relationships between CT value and relative electron density for treatment planning system[J]. Chinese Journal of Radiation Oncology, 2012, 21(3): 281-284.
2012, Vol. 21 
