TY - GEN
T1 - Projection correlation based noise reduction in volume CT
AU - Yan, Hao
AU - Mou, Xuanqin
PY - 2010
Y1 - 2010
N2 - De-noising algorithms for volume CT are proposed based on the correlation of the cone beam (CB) CT projections. The main idea is: when the correlated pixels among the neighboring views are added together according to this projection correlation (PC), the signal will be retained, whereas the noise variance upon them will be reduced by this averaging process, because the signal obeys this correlation but noise not. PC based filtering (PCF) method is developed. PCF is further integrated as PC based penalty weighted least square (PC-PWLS) method. Validations are performed for two volume scans: one is ideal low-dose case, and the other considers the high-frequency scatter residues after scatter correction. By using the proposed methods, significant noise suppressing is illustrated; meanwhile, the spatial resolution can be well preserved. For the low dose scan, SNR (Signal to Noise Ratio) increases are around 14 dB. For the cone beam scan with high frequency scatter residues, an effect approaching to the fan-beam scan is achieved.
AB - De-noising algorithms for volume CT are proposed based on the correlation of the cone beam (CB) CT projections. The main idea is: when the correlated pixels among the neighboring views are added together according to this projection correlation (PC), the signal will be retained, whereas the noise variance upon them will be reduced by this averaging process, because the signal obeys this correlation but noise not. PC based filtering (PCF) method is developed. PCF is further integrated as PC based penalty weighted least square (PC-PWLS) method. Validations are performed for two volume scans: one is ideal low-dose case, and the other considers the high-frequency scatter residues after scatter correction. By using the proposed methods, significant noise suppressing is illustrated; meanwhile, the spatial resolution can be well preserved. For the low dose scan, SNR (Signal to Noise Ratio) increases are around 14 dB. For the cone beam scan with high frequency scatter residues, an effect approaching to the fan-beam scan is achieved.
UR - http://www.scopus.com/inward/record.url?scp=79960309699&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79960309699&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2010.5874336
DO - 10.1109/NSSMIC.2010.5874336
M3 - Conference contribution
AN - SCOPUS:79960309699
SN - 9781424491063
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 2948
EP - 2953
BT - IEEE Nuclear Science Symposuim and Medical Imaging Conference, NSS/MIC 2010
T2 - 2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010
Y2 - 30 October 2010 through 6 November 2010
ER -