PMID- 32403067
OWN - NLM
STAT- MEDLINE
DCOM- 20210406
LR  - 20210406
IS  - 1724-191X (Electronic)
IS  - 1120-1797 (Linking)
VI  - 74
DP  - 2020 Jun
TI  - Estimation of size-specific dose estimates (SSDE) for paediatric and adults 
      patients based on a single slice.
PG  - 30-39
LID - S1120-1797(20)30112-5 [pii]
LID - 10.1016/j.ejmp.2020.05.001 [doi]
AB  - Volume averaged CT dose index (CTDI(vol)) is an important dose index utilized for 
      CT dosimetry. Measurements of CTDI(vol) are performed in reference cylindrical 
      phantoms of specified diameters. A size-specific dose estimate (SSDE) has been 
      recommended for assessment of doses delivered to individual patients. Evaluation 
      of the SSDE requires the size of the scanned region of the patient to be 
      estimated in terms of water-equivalent diameter (D(w)) to allow calculation of a 
      dose value appropriate for the patient. Estimation of D(w), however, may be 
      challenging and time consuming as it requires assessment of D(w) for each slice 
      within the scanned region. A study has been carried out to investigate the 
      suitability of using D(w,mid) for a single slice at the middle of the scanned 
      region to estimate a value of D(w,mean) to apply to all slices. 351 phantoms (158 
      paediatric and 193 adult) developed from reconstructed CT images of patients were 
      employed. Six scan regions were studied: chest, abdomen, pelvis, chest and 
      abdomen, abdomen and pelvis, and the whole trunk. Results show that the use of 
      D(w,mid) can lead to over or underestimation of D(w,mean) by up to 13% for 
      paediatric and adult patients. SSDE values based on D(w,mid) and D(w,mean) were 
      assessed for each phantom, and a linear regression analysis was performed. Use of 
      the analysis could provide a simple and practical approach to assessing SSDE for 
      a given scan based on D(w,mid) with the root-mean-square errors estimated to be 
      in the range of 1.2%-4.0% for paediatric and 1.2%-5.9% for adults.
CI  - Copyright (c) 2020 Associazione Italiana di Fisica Medica. All rights reserved.
FAU - Abuhaimed, Abdullah
AU  - Abuhaimed A
AD  - King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia.
FAU - Martin, Colin J
AU  - Martin CJ
AD  - Department of Clinical Physics and Bioengineering, University of Glasgow, 
      Glasgow, UK; International Commission on Radiological Protection, Ottawa, Canada.
LA  - eng
PT  - Journal Article
DEP - 20200508
PL  - Italy
TA  - Phys Med
JT  - Physica medica : PM : an international journal devoted to the applications of 
      physics to medicine and biology : official journal of the Italian Association of 
      Biomedical Physics (AIFB)
JID - 9302888
SB  - IM
MH  - Adult
MH  - Child
MH  - Humans
MH  - *Phantoms, Imaging
MH  - *Radiation Dosage
MH  - Tomography, X-Ray Computed/*instrumentation
OTO - NOTNLM
OT  - Size-specific dose estimate (SSDE)
OT  - Volume averaged CT dose index (CTDI(vol))
OT  - Water-equivalent diameter (D(w))
EDAT- 2020/05/14 06:00
MHDA- 2021/04/07 06:00
CRDT- 2020/05/14 06:00
PHST- 2020/01/17 00:00 [received]
PHST- 2020/03/15 00:00 [revised]
PHST- 2020/05/01 00:00 [accepted]
PHST- 2020/05/14 06:00 [pubmed]
PHST- 2021/04/07 06:00 [medline]
PHST- 2020/05/14 06:00 [entrez]
AID - S1120-1797(20)30112-5 [pii]
AID - 10.1016/j.ejmp.2020.05.001 [doi]
PST - ppublish
SO  - Phys Med. 2020 Jun;74:30-39. doi: 10.1016/j.ejmp.2020.05.001. Epub 2020 May 8.