title: Diagnostic accuracy and effective radiation dose of high pitch dual source multidetector computed tomography in evaluation of coronary artery bypass graft patency.
abstract: OBJECTIVE
  The aim of the study was to evaluate the diagnostic accuracy and effective radiation dose (ERD) of high pitch dual source multidetector computed tomography (MDCT) for coronary artery bypass graft (CABG) patency.
  
  
  METHODS
  Fourty-five patients who underwent 128 × 2‑slice MDCT angiography with a prospective electrocardiogram-triggering, low-dose, high pitch, dual source, flash spiral acquisition mode after CABG surgery were included in the study. The interobserver agreement of the image quality was evaluated with Cohen κ value. The image quality was compared to the heart rates (HRs) using Mann-Whitney U test and to the graft segments using χ(2) test. The findings for the CABG patency on MDCT were compared to those determined on catheter coronary angiography. Dose-length product (DLP) and ERD were compared to the gender, HRs, and body mass index (BMI) of the patients using Kruskall Wallis and Mann-Whitney U tests.
  
  
  RESULTS
  A total of 110 grafts and 330 vessel segments were evaluated with a good interobserver agreement (κ = 0.80). The image quality was better in proximal and middle graft segments (p < 0.05), as well as in the patients with low HRs (p < 0.05). High pitch MDCT had the following sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy for evaluation of graft patency: 92.8, 99.3, 92.8, 99.3 and 98.8 %, respectively. ERD was correlated to the HRs and BMI.
  
  
  CONCLUSIONS
  High pitch 128 × 2‑slice dual source CT angiography is a noninvasive imaging modality, and it can be safely and effectively used in evaluation of CABG patency with lower radiation dose.
authors.affiliation: Department of Radiology, Medical Faculty, Selcuk University, The Central Campus, 42075, Konya, Turkey. koplaymustafa@hotmail.com.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Koplay
authors.affiliation: Department of Radiology, Medical Faculty, Bulent Ecevit University, Zonguldak, Turkey.
authors.forename: Serkan
authors.initials: S
authors.lastname: Guneyli
authors.affiliation: Department of  Cardiovascular Surgery, Medical Faculty, Selcuk University, Konya, Turkey.
authors.forename: Hakan
authors.initials: H
authors.lastname: Akbayrak
authors.affiliation: Department of Cardiology, Medical Faculty, Selcuk University, Konya, Turkey.
authors.forename: Kenan
authors.initials: K
authors.lastname: Demir
authors.affiliation: Department of Radiology, Medical Faculty, Selcuk University, The Central Campus, 42075, Konya, Turkey.
authors.forename: Mesut
authors.initials: M
authors.lastname: Sivri
authors.affiliation: Department of Cardiology, Medical Faculty, Selcuk University, Konya, Turkey.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Avci
authors.affiliation: Department of Radiology, Medical Faculty, Selcuk University, The Central Campus, 42075, Konya, Turkey.
authors.forename: Hasan
authors.initials: H
authors.lastname: Erdogan
authors.affiliation: Department of Radiology, Medical Faculty, Selcuk University, The Central Campus, 42075, Konya, Turkey.
authors.forename: Yahya
authors.initials: Y
authors.lastname: Paksoy
mesh_terms: D000368:Aged; D000072226:Computed Tomography Angiography / Q000379:methods; D017023:Coronary Angiography / Q000379:methods*; D001026:Coronary Artery Bypass; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000601:surgery*; D005260:Female; D006085:Graft Survival; D006801:Humans; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography / Q000379:methods*; D011829:Radiation Dosage; D000069079:Radiation Exposure / Q000032:analysis* / Q000517:prevention & control; D011835:Radiation Protection / Q000379:methods; D011874:Radiometry; D012062:Relative Biological Effectiveness; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014654:Vascular Patency
keywords: Coronary artery bypass graft; Dual source; High pitch; Multidetector computed tomography; Radiation dose