title: Coronary artery stent imaging with 128-slice dual-source CT using high-pitch spiral acquisition in a cardiac phantom: comparison with the sequential and low-pitch spiral mode.
abstract: OBJECTIVE
  To evaluate coronary stents in vitro using 128-slice-dual-source computed tomography (CT).
  
  
  METHODS
  Twelve different coronary stents placed in a non-moving cardiac/chest phantom were examined by 128-slice dual-source CT using three CT protocols [high-pitch spiral (HPS), sequential (SEQ) and conventional spiral (SPIR)]. Artificial in-stent lumen narrowing (ALN), visible inner stent area (VIA), artificial in-stent lumen attenuation (ALA) in percent, image noise inside/outside the stent and CTDIvol were measured.
  
  
  RESULTS
  Mean ALN was 46% for HPS, 44% for SEQ and 47% for SPIR without significant difference. Mean VIA was similar with 31% for HPS, 30% for SEQ and 33% for SPIR. Mean ALA was, at 5% for HPS, significantly lower compared with -11% for SPIR (p = 0.024), but not different from SEQ with -1%. Mean image noise was significantly higher for HPS compared with SEQ and SPIR inside and outside the stent (p < 0.001). CTDIvol was lower for HPS (5.17 mGy), compared with SEQ (9.02 mGy) and SPIR (55.97 mGy), respectively.
  
  
  CONCLUSIONS
  The HPS mode of 128-slice dual-source CT yields fewer artefacts inside the stent lumen compared with SPIR and SEQ, but image noise is higher. ALN is still too high for routine stent evaluation in clinical practice. Radiation dose of the HPS mode is markedly (less than about tenfold) reduced.
authors.affiliation: Department of Radiology, Division of Cardiovascular and Interventional Radiology, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. florian.wolf@meduniwien.ac.at
authors.forename: Florian
authors.initials: F
authors.lastname: Wolf
authors.forename: Sebastian
authors.initials: S
authors.lastname: Leschka
authors.forename: Christian
authors.initials: C
authors.lastname: Loewe
authors.forename: Peter
authors.initials: P
authors.lastname: Homolka
authors.forename: Christina
authors.initials: C
authors.lastname: Plank
authors.forename: Ruediger
authors.initials: R
authors.lastname: Schernthaner
authors.forename: Dominik
authors.initials: D
authors.lastname: Bercaczy
authors.forename: Robert
authors.initials: R
authors.lastname: Goetti
authors.forename: Johannes
authors.initials: J
authors.lastname: Lammer
authors.forename: Guy
authors.initials: G
authors.lastname: Friedrich
authors.forename: Borut
authors.initials: B
authors.lastname: Marincek
authors.forename: Hatem
authors.initials: H
authors.lastname: Alkadhi
authors.forename: Gudrun
authors.initials: G
authors.lastname: Feuchtner
mesh_terms: D000465:Algorithms; D001807:Blood Vessel Prosthesis; D017023:Coronary Angiography / Q000379:methods*; D003331:Coronary Vessels / Q000601:surgery*; D006801:Humans; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015607:Stents; D014057:Tomography, X-Ray Computed / Q000379:methods*
references.citation: J Cardiovasc Comput Tomogr. 2009 Jul-Aug;3(4):224-32
references.pmid: 19577209
references.citation: Eur Heart J. 2006 Nov;27(21):2567-72
references.pmid: 17035252
references.citation: Eur Radiol. 2009 Nov;19(11):2576-83
references.pmid: 19760421
references.citation: Heart. 2008 Jul;94(7):848-54
references.pmid: 17881474
references.citation: AJR Am J Roentgenol. 2008 Jul;191(1):56-63
references.pmid: 18562725
references.citation: Invest Radiol. 2006 Jan;41(1):22-7
references.pmid: 16355036
references.citation: AJR Am J Roentgenol. 2009 Sep;193(3):787-94
references.pmid: 19696293
references.citation: Am J Cardiol. 2007 Dec 15;100(12):1754-8
references.pmid: 18082521
references.citation: Phys Med Biol. 2002 Aug 21;47(16):2907-16
references.pmid: 12222854
references.citation: Eur Radiol. 2009 Sep;19(9):2147-55
references.pmid: 19415293
references.citation: Radiology. 2007 Nov;245(2):416-23
references.pmid: 17890353
references.citation: Radiology. 2008 Jun;247(3):687-95
references.pmid: 18424688
references.citation: AJR Am J Roentgenol. 2009 Apr;192(4):1045-50
references.pmid: 19304712
references.citation: Eur Radiol. 2009 Oct;19(10):2357-62
references.pmid: 19565245
references.citation: Eur J Radiol. 2008 Dec;68(3):465-70
references.pmid: 17913428
references.citation: Radiology. 2007 Nov;245(2):424-32
references.pmid: 17890354
references.citation: Eur J Radiol. 2009 Mar;69(3):489-95
references.pmid: 18162351
references.citation: Am J Cardiol. 2008 Mar 15;101(6):820-4
references.pmid: 18328847
references.citation: Eur J Radiol. 2010 Nov;76(2):188-94
references.pmid: 19570632
references.citation: J Am Coll Cardiol. 2007 Mar 6;49(9):951-9
references.pmid: 17336718
references.citation: Eur Radiol. 2009 Jan;19(1):42-9
references.pmid: 18682956
references.citation: Acta Radiol. 2006 Feb;47(1):36-42
references.pmid: 16498931
references.citation: J Cardiovasc Comput Tomogr. 2009 Mar-Apr;3(2):117-21
references.pmid: 19332343
references.citation: Eur Radiol. 2009 Dec;19(12):2896-903
references.pmid: 19760229
references.citation: Eur Radiol. 2006 Apr;16(4):818-26
references.pmid: 16333623
references.citation: Catheter Cardiovasc Interv. 2007 Jun 1;69(7):933-8
references.pmid: 17421013