title: Feasibility of high-pitch dual-source low-dose chest CT: Reduction of radiation and cardiac artifacts.
abstract: OBJECTIVE
  To compare the radiation dose and image quality, focused mainly on cardiac pulsation artifact, between high-pitch low-dose chest computed tomography (HP-LDCT) and standard low-dose chest CT (LDCT).
  
  
  METHODS
  One hundred patients underwent HP-LDCT (50 patients) or LDCT (50 patients). Scan parameters were the same except for the pitch and gantry rotation time: 3.0 vs. 1.2 and 0.28s vs. 0.5s, respectively. Objective image noise at five regions and subjective image quality, such as noise, artifacts, cardiac pulsation artifacts, and overall diagnostic acceptability, were evaluated using a five-point scale. The significance level for all tests was set at P<0.05.
  
  
  RESULTS
  The dose-length products (DLPs) with HP-LDCT and LDCT were 90.2±4.3mGycm and 103.1±6.4mGycm, respectively (P<0.01). DLP of HP-LDCT showed a 13% reduction versus LDCT. Objective image noise was not significantly different. Cardiac pulsation artifacts showed a significant reduction on HP-LDCT (P<0.01). Other subjective image quality parameters of HP-LDCT were similar to those of LDCT. The overall diagnostic acceptability of HP-LDCT was better than that of LDCT (P<0.01).
  
  
  CONCLUSIONS
  HP-LDCT showed a 13% mean radiation dose reduction with no deterioration in image quality due to cardiac pulsation artifacts.
authors.affiliation: Department of Radiology, Soonchunhyang University Seoul Hospital, 59 Daesagwan-ro, Yongsan-gu, Seoul, 140-743, Republic of Korea. Electronic address: merhen98@gmail.com.
authors.forename: H K
authors.initials: HK
authors.lastname: Lim
authors.affiliation: Department of Radiology, Hallym University Medical Center, Hallym University Sacred Heart Hospital, 896 Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do, 431-070, Republic of Korea. Electronic address: ha.hongil@gmail.com.
authors.forename: H I
authors.initials: HI
authors.lastname: Ha
authors.affiliation: Department of Radiology, Hallym University Medical Center, Hallym University Sacred Heart Hospital, 896 Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do, 431-070, Republic of Korea. Electronic address: hjhwang@hallym.or.kr.
authors.forename: H J
authors.initials: HJ
authors.lastname: Hwang
authors.affiliation: Department of Radiology, Hallym University Medical Center, Hallym University Sacred Heart Hospital, 896 Pyeongchon-dong, Dongan-gu, Anyang-si, Gyeonggi-do, 431-070, Republic of Korea. Electronic address: kwanseop@hallym.or.kr.
authors.forename: K
authors.initials: K
authors.lastname: Lee
mesh_terms: D016477:Artifacts; D005240:Feasibility Studies; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D011829:Radiation Dosage; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Dual-source CT; High-pitch; Radiation dose reduction; Thorax