title: Utility of triple channel injection of contrast material with mixture of saline, with acquisition in the cephalic direction for arterial trees in the thorax using multislice computed tomography.
abstract: BACKGROUND
  If contrast material is injected into the cubital vein, artifacts due to high concentration of the contrast material in the vein lead to deterioration of the opacification of the thoracic aorta and the major branches. We describe a new protocol employing a combination of triple channel contrast material injection and a mixture of saline with acquisition in the cephalic direction utilizing capability of 16-slice multislice CT.
  
  
  METHODS
  Of 35 subjects who underwent thoracic CT, 18 were injected with 70 ml contrast each prior to scanning with acquisition in the cephalic direction during the injection of 30 ml contrast diluted 50/50 with saline, followed by the injection of 20 ml of saline (new protocol). Seventeen subjects were injected each with 100 ml contrast at 3 ml/s, with scanning in the caudal direction (ordinary protocol).
  
  
  RESULTS
  In the new protocol, the major branches of the aorta and the left ventricle were more opacified, but the veins were less opacified compared with the ordinary protocol, resulting in clear delineation of the thoracic aorta and the major branches without artifacts.
  
  
  CONCLUSIONS
  A new acquisition protocol is described in which the thoracic aorta and the major branches can be evaluated without artifact due to high CT values in the veins. Faster, more informative CT scans can be performed using diluted contrast.
authors.forename: Nobusada
authors.initials: N
authors.lastname: Funabashi
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Sato
authors.forename: Miki
authors.initials: M
authors.lastname: Asano
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakayama
authors.forename: Issei
authors.initials: I
authors.lastname: Komuro
mesh_terms: D003287:Contrast Media / Q000008:administration & dosage*; D006257:Head; D006801:Humans; D007269:Injections, Intra-Arterial; D012965:Sodium Chloride / Q000008:administration & dosage*; D013895:Thoracic Arteries / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D003287:Contrast Media; D012965:Sodium Chloride