Estimate of organ radiation absorbed doses in clinical CT using the radiation treatment planning system.
Organ absorbed doses in computed tomography (CT) scans can be measured with anatomical phantoms but not inside the human body. In this study, a straightforward method was investigated to estimate organ doses in clinical CT using the radiation treatment planning system (RTPS) and compared them with experimental results of photoluminescence dosemeters (PLD). In a heterogeneous phantom, the average difference between PLD and RTPS values were -5.0% for the body and 7.1% for the lung. Using CT data, organ doses in 30 clinical cases were then calculated. There was a significant inverse correlation between the calculated values of organ doses and body mass index (BMI, correlation coefficients (r) = -0.69 (whole body), -0.80 (right lung), -0.81 (left lung), -0.76 (spinal cord), -0.74 (vertebra bone), -0.74 (heart), and -0.79 (oesophagus), all p < 0.01). An RTPS can be a simple and useful tool for estimating equivalent doses inside the human body, during whole-body CT scans.
Fujibuchi
Toshioh
T
Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan. fujibuchi@ipu.ac.jp
Funabashi
Nobusada
N
Hashimoto
Masatoshi
M
Kato
Hideyuki
H
Kurokawa
Masayuki
M
Deloar
Hossain M
HM
Kunieda
Etsuo
E
Komuro
Issei
I
Sakae
Takeji
T
D015992:Body Mass Index; D006801:Humans; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011835:Radiation Protection; D013902:Radiography, Thoracic; D011880:Radiotherapy Planning, Computer-Assisted / Q000706:statistics & numerical data*; D014057:Tomography, X-Ray Computed; D014916:Whole-Body Irradiation