title: The comparison of high and standard definition computed tomography techniques regarding coronary artery imaging.
abstract: OBJECTIVE
  The aim was to compare coronary high-definition CT (HDCT) with standard-definition CT (SDCT) angiography as to radiation dose, image quality and accuracy.
  
  
  METHODS
  28 patients with history of coronary artery disease scanned by HDCT (Discovery CT750 HD) and SDCT (Somatom Definition AS). The scan modes were both axial prospective ECG-triggered. The vessel diameters and vessel attenuation values of totally 280 measurements from 140 coronary arteries were analyzed by two experienced radiologists. All data was analyzed by intraclass correlation test. Image quality graded by motion and stair step artifacts (grade 1, poor, to grade 4, excellent), accuracy of vessel inner and outer diameters were compared between the two CT units using the independent samples t-test and Mann-Whitney U test.
  
  
  RESULTS
  The intraclass correlation coefficient (ICC) of measured vessel attenuation values in SDCT between the two radiologists was exceedingly good. The ICC was higher in HDCT. The radiation dose of HDCT was higher than that of SDCT. The mean tube current was 180 (mA) in HDCT and 147(mA) in SDCT with the same tube voltage (kVp). There was no significant difference between image quality.
  
  
  CONCLUSIONS
  HDCT has a higher radiation dose but has much more atenuation and the spatial resolution which improve measurement accuracy for imaging coronary arteries.
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Aktas
authors.initials: A
authors.lastname: Aykut
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Degirmenci
authors.initials: D
authors.lastname: Bumin
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Yilmaz
authors.initials: Y
authors.lastname: Omer
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Kayan
authors.initials: K
authors.lastname: Mustafa
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Cetin
authors.initials: C
authors.lastname: Meltem
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Celik
authors.initials: C
authors.lastname: Orhan
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Unlu
authors.initials: U
authors.lastname: Nisa
authors.affiliation: Suleyman Demirel University, Biostatistics Dept.
authors.forename: Orhan
authors.initials: O
authors.lastname: Hikmet
authors.affiliation: Suleyman Demirel University, Radiology Dept.
authors.forename: Demirtas
authors.initials: D
authors.lastname: Hakan
authors.affiliation: Near East University, Radiology Dept.
authors.forename: Koroglu
authors.initials: K
authors.lastname: Mert
mesh_terms: D000328:Adult; D000368:Aged; D017023:Coronary Angiography / Q000379:methods*; D003327:Coronary Disease / Q000000981:diagnostic imaging* / Q000628:therapy*; D003331:Coronary Vessels / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011829:Radiation Dosage; D011857:Radiographic Image Interpretation, Computer-Assisted; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*
keywords: Angiography; Computerised Tomography; Coronary Arteries