PMID- 36315380
OWN - NLM
STAT- MEDLINE
DCOM- 20221215
LR  - 20221222
IS  - 2662-4737 (Electronic)
IS  - 2662-4729 (Linking)
VI  - 45
IP  - 4
DP  - 2022 Dec
TI  - SIZE-specific dose estimate for lower-limb CT.
PG  - 1183-1191
LID - 10.1007/s13246-022-01186-4 [doi]
AB  - The Computed Tomography Dose Index (CTDI) is an indicator for dose management in 
      computed tomography (CT), but has limited use for patient dosimetry. To evaluate 
      the patient dose, the size-specific dose estimate (SSDE), reported by the 
      American Association of Physics in Medicine task groups 204, 220, and 293, must 
      be calculated by the CTDI(vol)(z) displayed on the CT console, and the conversion 
      factor f(D(z)) from the effective diameter (D(Eff)) or water equivalent diameter 
      (D(w)). However, no reports have verified the appropriateness of using the 320-mm 
      diameter phantom for dose assessment in CT examinations involving the lower 
      limbs. Therefore, we validated a new method for evaluating the SSDE(z) of the 
      lower limbs, using two 160-mm diameter phantoms instead of the 320-mm diameter 
      phantom. The CTDI(vol)(z) obtained from Monte Carlo (MC) simulation study was 
      reliable because they were almost the same as obtained in a dosimetry study. The 
      conversion factor f (D (z(l.l.))) for the lower limbs was evaluated based on the 
      CTDI(vol)(z) obtained by MC simulation performed using two polymethyl 
      methacrylate cylinder phantoms of 160-mm diameter. The MC simulation was 
      performed by the International Commission on Radiological Protection publication 
      135 reference adult phantom and was used to evaluate the absorbed dose of the 
      pelvis, thighs, knees, and ankles. The dose showing the greatest difference was 
      the thighs, which was 8.3 mGy (16%) lower than the absorbed dose. Thus, the SSDE 
      (z(l.l.)) could be estimated from the [Formula: see text] displayed on the CT 
      scanner console.
CI  - (c) 2022. Australasian College of Physical Scientists and Engineers in Medicine.
FAU - Kobayashi, Masanao
AU  - Kobayashi M
AUID- ORCID: 0000-0003-0273-0755
AD  - Graduate School of Medical Sciences, Fujita Health University, 1-98 
      Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan. masa1121@fujita-hu.ac.jp.
FAU - Nishihara, Yusei
AU  - Nishihara Y
AD  - Department of Radiology, Fujita Health University Hospital, 1-98 Dengakugakubo, 
      Kutsukake-cho, Toyoake, Aichi, Japan.
FAU - Haba, Tomonobu
AU  - Haba T
AUID- ORCID: 0000-0002-5257-6162
AD  - Graduate School of Medical Sciences, Fujita Health University, 1-98 
      Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan.
FAU - Matsunaga, Yuta
AU  - Matsunaga Y
AUID- ORCID: 0000-0002-2356-9385
AD  - Department of Imaging, Nagoya Kyoritsu Hospital, 1-172 Hokke, Nakagawa-ku, 
      Nagoya, Aichi, Japan.
FAU - Asada, Yasuki
AU  - Asada Y
AD  - Graduate School of Medical Sciences, Fujita Health University, 1-98 
      Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan.
FAU - Kobayashi, Shigeki
AU  - Kobayashi S
AD  - Graduate School of Medical Sciences, Fujita Health University, 1-98 
      Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan.
LA  - eng
PT  - Journal Article
DEP - 20221031
PL  - Switzerland
TA  - Phys Eng Sci Med
JT  - Physical and engineering sciences in medicine
JID - 101760671
SB  - IM
MH  - Adult
MH  - Humans
MH  - Radiation Dosage
MH  - Monte Carlo Method
MH  - *Radiometry
MH  - *Tomography, X-Ray Computed/methods
MH  - Lower Extremity/diagnostic imaging
OTO - NOTNLM
OT  - CT
OT  - Monte Carlo simulation
OT  - Patient dose
OT  - Size-specific dose estimate
EDAT- 2022/11/01 06:00
MHDA- 2022/12/16 06:00
CRDT- 2022/10/31 12:21
PHST- 2022/07/27 00:00 [received]
PHST- 2022/10/03 00:00 [accepted]
PHST- 2022/11/01 06:00 [pubmed]
PHST- 2022/12/16 06:00 [medline]
PHST- 2022/10/31 12:21 [entrez]
AID - 10.1007/s13246-022-01186-4 [pii]
AID - 10.1007/s13246-022-01186-4 [doi]
PST - ppublish
SO  - Phys Eng Sci Med. 2022 Dec;45(4):1183-1191. doi: 10.1007/s13246-022-01186-4. Epub 
      2022 Oct 31.