PMID- 20661694
OWN - NLM
STAT- MEDLINE
DCOM- 20101122
LR  - 20211020
IS  - 1867-108X (Electronic)
IS  - 1867-1071 (Linking)
VI  - 28
IP  - 6
DP  - 2010 Jul
TI  - Coronary computed tomography angiography using prospective 
      electrocardiography-gated axial scans with 64-detector computed tomography: 
      evaluation of stair-step artifacts and padding time.
PG  - 437-45
LID - 10.1007/s11604-010-0448-7 [doi]
AB  - PURPOSE: We compared stair-step artifacts and radiation dose between prospective 
      electrocardiography (ECG)-gated coronary computed tomography angiography 
      (prospective CCTA) and retrospective CCTA using 64-detector CT and determined the 
      optimal padding time (PT) for prospective CCTA. MATERIALS AND METHODS: We 
      retrospectively evaluated 183 patients [mean heart rate (HR) <65 beats/min, 
      maximum HR instability <5 beats/min] who had undergone CCTA. We scored stair-step 
      artifacts from 1 (severe) to 5 (none) and evaluated the effective dose in 53 
      patients with retrospective CCTA and 130 with prospective CCTA (PT 200 ms, n = 
      32; PT 50 ms, n = 98). RESULTS: Mean artifact scores were 4.3 in both 
      retrospective and prospective CCTAs. However, statistically more arteries scored 
      <3 (nonassessable) on prospective CCTA (P < 0.001). Mean scores for prospective 
      CCTA with 200- and 50-ms PT were 4.1 and 4.3, respectively (no significant 
      difference). The radiation dose of prospective CCTA was reduced by 59.1% to 
      80.7%. CONCLUSION: Prospective CCTA reduces the radiation dose and allows 
      diagnostic imaging in most cases but shows more nonevaluable artifacts than 
      retrospective CCTA. Use of 50-ms instead of 200-ms PT appears to maintain image 
      quality in patients with a mean HR < 65 beats/min and HR instability of <5 
      beats/min.
FAU - Kimura, Fumiko
AU  - Kimura F
AD  - Department of Diagnostic Radiology, Saitama Medical University International 
      Medical Center, 1397-1 Yamane, Hidaka, 350-1298, Japan. fkimura@saitama-med.ac.jp
FAU - Umezawa, Tatsuo
AU  - Umezawa T
FAU - Asano, Tomonari
AU  - Asano T
FAU - Chihara, Ruri
AU  - Chihara R
FAU - Nishi, Naoko
AU  - Nishi N
FAU - Nishimura, Shigeyoshi
AU  - Nishimura S
FAU - Sakai, Fumikazu
AU  - Sakai F
LA  - eng
PT  - Comparative Study
PT  - Evaluation Study
PT  - Journal Article
DEP - 20100727
PL  - Japan
TA  - Jpn J Radiol
JT  - Japanese journal of radiology
JID - 101490689
RN  - 0 (Contrast Media)
RN  - 4419T9MX03 (Iohexol)
SB  - IM
MH  - Adult
MH  - Aged
MH  - Aged, 80 and over
MH  - *Artifacts
MH  - Contrast Media
MH  - Coronary Angiography/*methods
MH  - Coronary Artery Disease/diagnosis
MH  - Electrocardiography/*methods
MH  - Female
MH  - Heart Rate
MH  - Humans
MH  - Image Processing, Computer-Assisted/methods
MH  - Iohexol
MH  - Male
MH  - Middle Aged
MH  - Prospective Studies
MH  - Radiation Dosage
MH  - Radiographic Image Enhancement/methods
MH  - Retrospective Studies
MH  - Time Factors
MH  - Tomography, X-Ray Computed/*methods
MH  - Young Adult
EDAT- 2010/07/28 06:00
MHDA- 2010/12/14 06:00
CRDT- 2010/07/28 06:00
PHST- 2010/01/14 00:00 [received]
PHST- 2010/03/30 00:00 [accepted]
PHST- 2010/07/28 06:00 [entrez]
PHST- 2010/07/28 06:00 [pubmed]
PHST- 2010/12/14 06:00 [medline]
AID - 10.1007/s11604-010-0448-7 [doi]
PST - ppublish
SO  - Jpn J Radiol. 2010 Jul;28(6):437-45. doi: 10.1007/s11604-010-0448-7. Epub 2010 
      Jul 27.