title: Multiplanar 3D ultrasound imaging to assess the anatomy of the upper airway and measure the subglottic and tracheal diameters in adults.
abstract: OBJECTIVE
  To evaluate the feasibility of using three-dimensional (3D) ultrasound to assess the anatomy of the airway.
  
  
  METHODS
  11 young volunteers were recruited for 3D ultrasound and MRI of the airway. 3D ultrasound data were obtained from the level of the true vocal cords, cricoid cartilage and upper trachea. Multiplanar 3D ultrasound images were rendered and compared visually with corresponding MRI and cadaver anatomical sections. The anteroposterior (AP) and transverse diameter of the subglottic space and transverse diameter of the upper trachea were also measured in the 3D ultrasound and MR images and compared.
  
  
  RESULTS
  The airway anatomy was clearly delineated in the multiplanar 3D ultrasound images. It was also possible to identify the cricothyroid junction, and a simple method to measure the AP diameter of the subglottic space using this landmark is described. We were also able to accurately measure the transverse diameter of the upper trachea, but the transverse diameter of the subglottic space was overestimated using ultrasound. There was a strong correlation for the AP diameter measurement (r=0.94, p<0.05) and moderate correlation for the transverse diameter measurement (r=0.82, p=0.002) of the subglottic space, and a strong correlation for the transverse diameter measurement (r=0.91, p<0.05) of the upper trachea, in the ultrasound and MR images.
  
  
  CONCLUSIONS
  The anatomy of the adult airway can be assessed using 3D ultrasound. It can also be used to accurately measure the AP diameter of the subglottic space and the transverse diameter of the upper trachea.
  
  
  CONCLUSIONS
  This is the first report to describe the use of 3D ultrasound to evaluate the anatomy of the upper airway and accurately measure the AP diameter of the subglottic space and the transverse diameter of the upper trachea.
authors: Department of Anaesthesiology and Operating Services, North District Hospital, Sheung Shui, Hong Kong, China.
authors: D Y L
authors: DY
authors: Or
authors: M K
authors: MK
authors: Karmakar
authors: G C S
authors: GC
authors: Lam
authors: J W Y
authors: JW
authors: Hui
authors: J W
authors: JW
authors: Li
authors: P P
authors: PP
authors: Chen
mesh_terms: D000328:Adult; D003413:Cricoid Cartilage / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D010865:Pilot Projects; D014132:Trachea / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D014463:Ultrasonography; D014827:Vocal Cords / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D055815:Young Adult
references: Langenbecks Arch Surg. 2010 Sep;395(7):859-64
references: 20640934
references: Anaesthesia. 2003 Nov;58(11):1111-4
references: 14616599
references: Anesth Analg. 2012 May;114(5):987-92
references: 22366848
references: Eur Arch Otorhinolaryngol. 2010 Mar;267(3):477-9
references: 20041258
references: Anesth Analg. 2007 Mar;104(3):611-4
references: 17312218
references: Arch Otolaryngol Head Neck Surg. 2009 Mar;135(3):250-3
references: 19289702
references: Am J Emerg Med. 2011 Mar;29(3):359.e1-3
references: 20674236
references: J Ultrasound Med. 2010 Jan;29(1):79-85
references: 20040778
references: Chest. 2009 Oct;136(4):1014-1020
references: 19809049
references: Br J Anaesth. 2011 May;106(5):738-42
references: 21414983
references: J Otolaryngol. 2002 Aug;31(4):220-6
references: 12240757
references: Acad Emerg Med. 2011 Jul;18(7):754-8
references: 21707828
references: J Ultrasound Med. 2011 Jul;30(7):965-72
references: 21705729
references: Anesthesiology. 2010 Oct;113(4):819-24
references: 20808208
references: Laryngoscope. 2000 Nov;110(11):1957-61
references: 11081618
references: Acta Anaesthesiol Scand. 2011 Nov;55(10):1155-73
references: 22092121
references: Reg Anesth Pain Med. 2012 Jan-Feb;37(1):60-6
references: 22189575
references: Surg Radiol Anat. 1994;16(1):31-6
references: 8047966
references: Eur Respir J. 2006 Feb;27(2):384-9
references: 16452597