PMID- 25977348
OWN - NLM
STAT- MEDLINE
DCOM- 20161108
LR  - 20170103
IS  - 1742-3406 (Electronic)
IS  - 0144-8420 (Linking)
VI  - 168
IP  - 3
DP  - 2016 Mar
TI  - Doses metrics and patient age in CT.
PG  - 374-80
LID - 10.1093/rpd/ncv310 [doi]
AB  - The aim of this study was to investigate how effective dose and size-specific 
      dose estimate (SSDE) change with patient age (size) for routine head and 
      abdominal/pelvic CT examinations. Heads and abdomens of patients were modelled as 
      a mass-equivalent cylinder of water corresponding to the patient 'effective 
      diameter'. Head CT scans were performed at CTDIvol(S) of 40 mGy, and abdominal CT 
      scans were performed at CTDIvol(L) of 10 mGy. Values of SSDE were obtained using 
      conversion factors in AAPM Task Group Report 204. Age-specific scan lengths for 
      head and abdominal CT scans obtained from the authors' clinical practice were 
      used to estimate the dose-length product for each CT examination. Effective doses 
      were calculated from previously published age- and sex-specific E/DLP conversion 
      factors, based on ICRP 103 organ-weighting factors. For head CT examinations, the 
      scan length increased from 15 cm in a newborn to 20 cm in adults, and for an 
      abdominal/pelvic CT, the scan length increased from 20 cm in a newborn to 45 cm 
      in adults. For head CT scans, SSDE ranged from 37.2 mGy in adults to 48.8 mGy in 
      a newborn, an increase of 31 %. The corresponding head CT effective doses range 
      from 1.4 mSv in adults to 5.2 mSv in a newborn, an increase of 270 %. For abdomen 
      CT scans, SSDE ranged from 13.7 mGy in adults to 23.0 mGy in a newborn, an 
      increase of 68 %. The corresponding abdominal CT effective doses ranged from 6.3 
      mSv in adults to 15.4 mSv in a newborn, an increase of 140 %. SSDE increases much 
      less than effective dose in paediatric patients compared with adults because it 
      does not account for scan length or scattered radiation. Size- and age-specific 
      effective doses better quantify the total radiation received by patients in CT by 
      explicitly accounting for all organ doses, as well as their relative radio 
      sensitivity.
CI  - (c) The Author 2015. Published by Oxford University Press. All rights reserved. For 
      Permissions, please email: journals.permissions@oup.com.
FAU - Huda, Walter
AU  - Huda W
AD  - Department of Radiology and Radiological Science, MUSC, 96 Jonathan Lucas St, MSC 
      323, Charleston, SC 29425-3230, USA.
FAU - Tipnis, Sameer V
AU  - Tipnis SV
AD  - Department of Radiology and Radiological Science, MUSC, 96 Jonathan Lucas St, MSC 
      323, Charleston, SC 29425-3230, USA tipnis@musc.edu.
LA  - eng
PT  - Comparative Study
PT  - Journal Article
DEP - 20150513
PL  - England
TA  - Radiat Prot Dosimetry
JT  - Radiation protection dosimetry
JID - 8109958
SB  - IM
MH  - Adolescent
MH  - Adult
MH  - Female
MH  - Head/*diagnostic imaging
MH  - Humans
MH  - Infant, Newborn
MH  - Male
MH  - Pelvis/*diagnostic imaging
MH  - Radiation Dosage
MH  - Tomography, X-Ray Computed/*methods
MH  - Young Adult
EDAT- 2015/05/16 06:00
MHDA- 2016/11/09 06:00
CRDT- 2015/05/16 06:00
PHST- 2015/01/24 00:00 [received]
PHST- 2015/03/27 00:00 [accepted]
PHST- 2015/05/16 06:00 [entrez]
PHST- 2015/05/16 06:00 [pubmed]
PHST- 2016/11/09 06:00 [medline]
AID - ncv310 [pii]
AID - 10.1093/rpd/ncv310 [doi]
PST - ppublish
SO  - Radiat Prot Dosimetry. 2016 Mar;168(3):374-80. doi: 10.1093/rpd/ncv310. Epub 2015 
      May 13.