PMID- 33690180
OWN - NLM
STAT- MEDLINE
DCOM- 20211124
LR  - 20211124
IS  - 1361-6498 (Electronic)
IS  - 0952-4746 (Linking)
VI  - 41
IP  - 4
DP  - 2021 Nov 3
TI  - Dose quantities for measurement and comparison of doses to individual patients in 
      computed tomography (CT).
LID - 10.1088/1361-6498/abecf5 [doi]
AB  - The dose quantities displayed routinely on CT scanners, the volume averaged CT 
      dose index (CTDI(vol)) and dose length product, provide measures of doses 
      calculated for standard phantoms. The American Association of Medical Physics has 
      published conversion factors for the adjustment of CTDI(vol)to take account of 
      variations in patient size, the results being termed size-specific dose estimate 
      (SSDE). However, CTDI(vol)and SSDE, while useful in comparing and optimising 
      doses from a set procedure, do not provide risk-related information that takes 
      account of the organs and tissues irradiated and associated cancer risks. A 
      derivative of effective dose that takes account of differences in body and organ 
      sizes and masses, referred to here as size-specific effective dose (SED), can 
      provide such information. Data on organ doses from NCICT software that is based 
      on Monte Carlo simulations of CT scans for 193 adult phantoms have been used to 
      compute values of SED for CT examinations of the trunk and results compared with 
      corresponding values of SSDE. Relationships within +/-8% were observed between SED 
      and SSDE for scans extending over similar regions for phantoms with a wide range 
      of sizes. Coefficients have been derived from fits of the data to estimate SED 
      values from SSDEs for different regions of the body for scans of standard lengths 
      based on patient height. A method developed to take account of differences in 
      scan length gave SED results within +/-5% of values calculated using the NCI 
      phantom library. This approach could potentially be used to estimate SED from 
      SSDE values, allowing their display at the time a CT scan is performed.
CI  - Creative Commons Attribution license.
FAU - Martin, Colin J
AU  - Martin CJ
AUID- ORCID: 0000-0002-0784-9002
AD  - Department of Clinical Physics and Bioengineering, University of Glasgow, 
      Gartnavel Royal Hospital, Glasgow G12 0XH, United Kingdom.
FAU - Abuhaimed, Abdullah
AU  - Abuhaimed A
AUID- ORCID: 0000-0003-4635-2047
AD  - King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia.
FAU - Lee, Choonsik
AU  - Lee C
AUID- ORCID: 0000-0002-6219-6622
AD  - Division of Cancer Epidemiology and Genetics, National Cancer Institute, National 
      Institutes of Health, Rockville, MD, United States of America.
LA  - eng
PT  - Journal Article
DEP - 20211103
PL  - England
TA  - J Radiol Prot
JT  - Journal of radiological protection : official journal of the Society for 
      Radiological Protection
JID - 8809257
SB  - IM
MH  - Adult
MH  - Humans
MH  - Monte Carlo Method
MH  - Phantoms, Imaging
MH  - Radiation Dosage
MH  - *Radiometry
MH  - *Tomography, X-Ray Computed
OTO - NOTNLM
OT  - CT dosimetry
OT  - effective dose
OT  - patient dosimetry
OT  - size specific dose estimate (SSDE)
OT  - size specific effective dose (SED)
EDAT- 2021/03/11 06:00
MHDA- 2021/11/25 06:00
CRDT- 2021/03/10 17:59
PHST- 2021/02/04 00:00 [received]
PHST- 2021/03/09 00:00 [accepted]
PHST- 2021/03/11 06:00 [pubmed]
PHST- 2021/11/25 06:00 [medline]
PHST- 2021/03/10 17:59 [entrez]
AID - 10.1088/1361-6498/abecf5 [doi]
PST - epublish
SO  - J Radiol Prot. 2021 Nov 3;41(4). doi: 10.1088/1361-6498/abecf5.