PMID- 31811559
OWN - NLM
STAT- Publisher
LR  - 20240227
IS  - 1879-5447 (Electronic)
IS  - 0158-9938 (Linking)
DP  - 2019 Dec 6
TI  - Size-specific dose estimates for various weighting factors of CTDI equation.
LID - 10.1007/s13246-019-00830-w [doi]
AB  - Size-specific dose estimate (SSDE) was proposed by the American Association of 
      Physicists in Medicine (AAPM) Task Group 204 to consider the effect of patient 
      size in the x-ray CT dose estimation. Size correction factors to calculate SSDE 
      were derived based on the conventional weighted CT dose index (CTDI(w)) equation. 
      This study aims to investigate the influence of Bakalyar's and the authors' own 
      CTDI(w) equations on the size correction factors described by the AAPM Task Group 
      204, using Monte Carlo simulations. The simulations were performed by modeling 
      four types of x-ray CT scanner designs, to compute the dose values in water for 
      cylindrical phantoms with 8-40 cm diameters. CTDI(100) method and the AAPM Task 
      Group 111's proposed method were employed as the CT dosimetry models. Size 
      correction factors were obtained for the computed dose values of various phantom 
      diameters for the conventional, Bakalyar's, and the authors' weighting factors. 
      Maximum difference between the size correction factors for the Bakalyar's 
      weighting factor and those of the AAPM Task Group 204 was 27% for a phantom 
      diameter of 11.2 cm. On the other hand, the size correction factors calculated 
      for the authors' weighting factor were in good agreement with those from the AAPM 
      Task Group 204 report with a maximum difference of 17%. The results indicate that 
      the SSDE values obtained with the authors' weighting factor can be evaluated by 
      using the size correction factors reported by the AAPM Task Group 204, which is 
      currently accepted as a standard.
FAU - Haba, Tomonobu
AU  - Haba T
AUID- ORCID: 0000-0002-5257-6162
AD  - Faculty of Radiological TechnologySchool of Medical Science, Fujita Health 
      University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan. 
      habatomo@fujita-hu.ac.jp.
FAU - Kobayashi, Masanao
AU  - Kobayashi M
AD  - Faculty of Radiological TechnologySchool of Medical Science, Fujita Health 
      University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan.
FAU - Koyama, Shuji
AU  - Koyama S
AD  - Brain & Mind Research Center, Nagoya University, 1-1-20 Daiko-Minami, Higashi-ku, 
      Nagoya, Aichi, Japan.
LA  - eng
PT  - Journal Article
DEP - 20191206
PL  - Netherlands
TA  - Australas Phys Eng Sci Med
JT  - Australasian physical & engineering sciences in medicine
JID - 8208130
SB  - IM
OTO - NOTNLM
OT  - AAPM task group 111
OT  - AAPM task group 204
OT  - Monte carlo simulation
OT  - Size-specific dose estimate
OT  - Weighted CTDI
EDAT- 2019/12/08 06:00
MHDA- 2019/12/08 06:00
CRDT- 2019/12/08 06:00
PHST- 2019/08/17 00:00 [received]
PHST- 2019/12/02 00:00 [accepted]
PHST- 2019/12/08 06:00 [entrez]
PHST- 2019/12/08 06:00 [pubmed]
PHST- 2019/12/08 06:00 [medline]
AID - 10.1007/s13246-019-00830-w [pii]
AID - 10.1007/s13246-019-00830-w [doi]
PST - aheadofprint
SO  - Australas Phys Eng Sci Med. 2019 Dec 6. doi: 10.1007/s13246-019-00830-w.