TY - GEN
T1 - An experimental study on the variation of MTF and NPS caused by x-ray beam conditions for three indirect digital radiographic imagers
AU - Jeon, Hosang
AU - Cho, Gyuseong
AU - Chi, Yong Ki
AU - Chung, Myung Jin
AU - Kim, Kwang Hyun
PY - 2006
Y1 - 2006
N2 - Digital radiographie x-ray imagers are increasingly used in many clinical areas. So it is important to evaluate the performance of imagers. There is growing consensus in the scientific world that the detective quantum efficiency (DQE) is the best-suited parameter for describing the imaging performance of an x-ray imaging device. DQE is calculated with modulation transfer function (MTF) and noise power spectrum (NPS). As a preliminary study, MTF and NPS of three indirect digital radiographic imagers were measured and analyzed for comparison of imager performance for three imagers. The imagers were evaluated using two standard x-ray beam qualities, RQA5 and RQA9 recommended by an international electrotechnical commission (IEC) standard. For MTF and NPS measurement, edge method and two-dimensional fourier analysis method were adopted each other. In result, the highest MTF is observed in the imager with smallest pixel pitch and preprocessing of raw data among three imagers. There is a obvious MTF difference with preprocessing steps and a little difference between RQA5 and RQA9. NNPS is also affected by preprocessing steps. There are the significant increase of noise at low frequency because of the increase of the multiplicative noise component as exposure increases except CDXI-40G (Canon). The low NPS is relatively caused by high exposure level because of noise conversion process. In comparison, the lowest NPS imager was found. The evaluation of imaging performance using DQE concept will be done as our further study.
AB - Digital radiographie x-ray imagers are increasingly used in many clinical areas. So it is important to evaluate the performance of imagers. There is growing consensus in the scientific world that the detective quantum efficiency (DQE) is the best-suited parameter for describing the imaging performance of an x-ray imaging device. DQE is calculated with modulation transfer function (MTF) and noise power spectrum (NPS). As a preliminary study, MTF and NPS of three indirect digital radiographic imagers were measured and analyzed for comparison of imager performance for three imagers. The imagers were evaluated using two standard x-ray beam qualities, RQA5 and RQA9 recommended by an international electrotechnical commission (IEC) standard. For MTF and NPS measurement, edge method and two-dimensional fourier analysis method were adopted each other. In result, the highest MTF is observed in the imager with smallest pixel pitch and preprocessing of raw data among three imagers. There is a obvious MTF difference with preprocessing steps and a little difference between RQA5 and RQA9. NNPS is also affected by preprocessing steps. There are the significant increase of noise at low frequency because of the increase of the multiplicative noise component as exposure increases except CDXI-40G (Canon). The low NPS is relatively caused by high exposure level because of noise conversion process. In comparison, the lowest NPS imager was found. The evaluation of imaging performance using DQE concept will be done as our further study.
UR - https://www.scopus.com/pages/publications/38649126939
U2 - 10.1109/NSSMIC.2006.354278
DO - 10.1109/NSSMIC.2006.354278
M3 - Conference contribution
AN - SCOPUS:38649126939
SN - 1424405610
SN - 9781424405619
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 1960
EP - 1963
BT - 2006 IEEE Nuclear Science Symposium - Conference Record
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD
Y2 - 29 October 2006 through 4 November 2006
ER -