TY - JOUR
T1 - Fetal dose conversion factor for fetal computed tomography examinations
T2 - A mathematical phantom study
AU - Matsunaga, Yuta
AU - Kawaguchi, Ai
AU - Kobayashi, Masanao
AU - Suzuki, Shoichi
AU - Asada, Yasuki
AU - Ito, Kiyoshi
AU - Chida, Koichi
N1 - Publisher Copyright:
© 2017 American Association of Physicists in Medicine.
PY - 2017/9
Y1 - 2017/9
N2 - This study aimed to examine the relationship between fetal dose and the dose-length product, and to evaluate the impact of the number of rotations on the fetal doses and maternal effective doses using a 320-row multidetector computed tomography unit in a wide-volume mode. The radiation doses for the pregnant woman and the fetus were estimated using ImPACT CT Patient Dosimetry Calculator software for scan lengths ranging from 176 to 352 mm, using a 320-row unit in a wide-volume mode and an 80-row unit in a helical scanning mode. In the 320-row unit, the fetal doses in all scan lengths ranged from 3.51 to 6.52 mGy; the maternal effective doses in all scan lengths ranged from 1.05 to 2.35 mSv. In the 80-row unit, the fetal doses in all scan lengths ranged from 2.50 to 3.30 mGy; the maternal effective doses in all scan lengths ranged from 0.83 to 1.68 mSv. The estimated conversion factors from the dose-length product (mGy·cm) to fetal doses (mGy) for the 320-row unit in wide-volume mode and the 80-row unit in helical scanning mode were 0.06 and 0.05 (cm-1) respectively. While using a 320-row MDCT unit in a wide-volume mode, operators must take into account the number of rotations, the beam width as automatically determined by the scanner, the placement of overlap between volumetric sections, and the ratio of overlapping volumetric sections.
AB - This study aimed to examine the relationship between fetal dose and the dose-length product, and to evaluate the impact of the number of rotations on the fetal doses and maternal effective doses using a 320-row multidetector computed tomography unit in a wide-volume mode. The radiation doses for the pregnant woman and the fetus were estimated using ImPACT CT Patient Dosimetry Calculator software for scan lengths ranging from 176 to 352 mm, using a 320-row unit in a wide-volume mode and an 80-row unit in a helical scanning mode. In the 320-row unit, the fetal doses in all scan lengths ranged from 3.51 to 6.52 mGy; the maternal effective doses in all scan lengths ranged from 1.05 to 2.35 mSv. In the 80-row unit, the fetal doses in all scan lengths ranged from 2.50 to 3.30 mGy; the maternal effective doses in all scan lengths ranged from 0.83 to 1.68 mSv. The estimated conversion factors from the dose-length product (mGy·cm) to fetal doses (mGy) for the 320-row unit in wide-volume mode and the 80-row unit in helical scanning mode were 0.06 and 0.05 (cm-1) respectively. While using a 320-row MDCT unit in a wide-volume mode, operators must take into account the number of rotations, the beam width as automatically determined by the scanner, the placement of overlap between volumetric sections, and the ratio of overlapping volumetric sections.
UR - http://www.scopus.com/inward/record.url?scp=85027501124&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85027501124&partnerID=8YFLogxK
U2 - 10.1002/acm2.12154
DO - 10.1002/acm2.12154
M3 - Article
C2 - 28799286
AN - SCOPUS:85027501124
SN - 1526-9914
VL - 18
SP - 330
EP - 335
JO - Journal of applied clinical medical physics
JF - Journal of applied clinical medical physics
IS - 5
ER -