title: [Clinical application of high-pitch excretory phase images during dual-source CT urography with stellar photon detector].
abstract: OBJECTIVE
  To retrospectively evaluate the clinical feasibility of high-pitch excretory phase images during dual-source CT urography with Stellar photon detector.
  
  
  METHODS
  Totally 100 patients received dual-source CT high-pitch urinary excretory phase scanning with Stellar photon detector [80 kV, ref.92 mAs, CARE Dose 4D and CARE kV, pitch of 3.0, filter back projection reconstruction algorithm (FBP)] (group A). Another 100 patients received dual-source CT high-pitch urinary excretory phase scanning with common detector(100 kV, ref.140 mAs, CARE Dose 4D, pitch of 3.0, FBP) (group B). Quantitative measurement of CT value of urinary segments (Hounsfield units), image noise (Hounsfield units), and effective radiation dose (millisievert) were compared using independent-samples t test between two groups. Urinary system subjective opacification scores were compared using Mann-Whitney U test between two groups.
  
  
  RESULTS
  There was no significant difference in subjective opacification score of intrarenal collecting system and ureters between two groups (all P>0.05). The group A images yielded significantly higher CT values of all urinary segments (all P<0.01). There was no significant difference in image noise (P>0.05). The effective radiation dose of group A (1.1 mSv) was significantly lower than that of group B (3.79 mSv) (P<0.01).
  
  
  CONCLUSIONS
  High-pitch low-tube-voltage during excretory phase dual-source CT urography with Stellar photon detector is feasible, with acceptable image noise and lower radiation dose.
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Hao
authors.initials: H
authors.lastname: Sun
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Hua-dan
authors.initials: HD
authors.lastname: Xue
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Zheng-yu
authors.initials: ZY
authors.lastname: Jin
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Yong-lan
authors.initials: YL
authors.lastname: He
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Da-ming
authors.initials: DM
authors.lastname: Zhang
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhu
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Bing
authors.initials: B
authors.lastname: Qi
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Kai
authors.initials: K
authors.lastname: Xu
authors.affiliation: Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Ming
authors.initials: M
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D036542:Tomography, Spiral Computed / Q000379:methods*; D014567:Urography / Q000379:methods*; D055815:Young Adult