title: [Ultrafast MR sialography: comparison of two coil systems including an alternative surface coil].
abstract: OBJECTIVE
  To compare the visualization of salivary ducts by ultrafast magnetic resonance sialography (MR sialography) using an alternative surface coil and a conventional head-neck coil.
  
  
  METHODS
  In 11 healthy volunteers, ultrafast MR sialography (single shot turbo spin echo; acquisition time, 2.8 s) was performed before and after oral application of a sialogogue. Each subject received examinations with both a bilateral surface coil (SC) and a conventional head-neck coil (HNC). The depiction of parotideal and submandibular duct systems was graded from 1 to 5 (5 = poor) by four independent radiologists. ANOVA served for statistical analysis of duct rankings, and interobserver variability was determined by Intraclass Correlation Coefficient (ICC).
  
  
  RESULTS
  With an excellent ICC of 0.96, both coil systems offered symmetric visualization of salivary ducts, and the image quality increased after oral application of sialogogue (p < 0.001). In total, the overall rating was worse for SC than for HNC (2.13 +/- 1.24 vs. 1.45 +/- 0.65, p < 0.001). SC was especially inferior in depiction of submandibular and extraglandular duct components compared to HNC (p < 0.001).
  
  
  CONCLUSIONS
  Most notably due to the reduced visualization of extraglandular and submandibular ducts, the specific surface coil used in this study was inferior in image quality and does not constitute a reasonable alternative to conventional coil systems.
authors.affiliation: Abteilung für Diagnostische und Interventionelle Radiologie, Universitätsklinikum Heidelberg.
authors.forename: T F
authors.initials: TF
authors.lastname: Weber
authors.forename: M C
authors.initials: MC
authors.lastname: Cramer
authors.forename: D
authors.initials: D
authors.lastname: Aldefeld
authors.forename: F
authors.initials: F
authors.lastname: Weiss
authors.forename: K U
authors.initials: KU
authors.lastname: Petersen
authors.forename: F
authors.initials: F
authors.lastname: Reitmeier
authors.forename: M
authors.initials: M
authors.lastname: Jaehne
authors.forename: G
authors.initials: G
authors.lastname: Adam
authors.forename: C R
authors.initials: CR
authors.lastname: Habermann
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D008279:Magnetic Resonance Imaging; D008297:Male; D010306:Parotid Gland / Q000000981:diagnostic imaging / Q000473:pathology; D010307:Parotid Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D012465:Salivary Duct Calculi / Q000000981:diagnostic imaging* / Q000473:pathology; D018987:Salivary Ducts / Q000473:pathology*; D012796:Sialography / Q000379:methods; D013363:Submandibular Gland / Q000000981:diagnostic imaging / Q000473:pathology