title: Age-specific effective doses for pediatric MSCT examinations at a large children's hospital using DLP conversion coefficients: a simple estimation method.
abstract: BACKGROUND
  There is a need for an easily accessible method for effective dose estimation in pediatric CT.
  
  
  OBJECTIVE
  To estimate effective doses for a variety of pediatric neurological and body CT examinations in five age groups using recently published age- and region-specific dose length product (DLP) to effective dose conversion coefficients.
  
  
  METHODS
  A retrospective review was performed of 1,431 consecutive CT scans over a 12-week period using age- and weight-adjusted CT protocols. Age- and region-specific DLP to effective dose conversion coefficients were applied to console-displayed DLP data.
  
  
  RESULTS
  Effective dose estimates for single-phase head CT scans in neonatal, and 1-, 5-, 10- and 15-year-old age groups were 4.2, 3.6, 2.4, 2.0 and 1.4 mSv, respectively. For abdomen/pelvis CT scans the corresponding effective doses were 13.1, 11.1, 8.4, 8.9 and 5.9 mSv. The range of pediatric CT effective doses is wide, from ultralow dose protocols (<1 mSv) to extended-coverage body examinations (10-15 mSv).
  
  
  CONCLUSIONS
  Age- and region-specific pediatric DLP to effective dose conversion coefficients provide an accessible and user-friendly method for estimating pediatric CT effective doses that is available to radiologists working without medical physics support.
authors.affiliation: Department of Diagnostic Imaging, The Hospital for Sick Children, 555 University Ave., Toronto, M5G 1X8, Canada. karen.thomas@sickkids.ca
authors.forename: Karen E
authors.initials: KE
authors.lastname: Thomas
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D017677:Age Distribution; D002648:Child; D002675:Child, Preschool; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D015233:Models, Statistical; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data*