The Effect of the CT Number for Each CT on Photon Dose Calculation

被引:0
|
作者
Cho, Kwang Hwan [1 ,2 ]
Shin, Dongho [3 ]
Cho, Sam Ju [2 ]
Jang, Jisun [2 ]
Lee, Sang Hoon [2 ]
Kim, Yong Ho [1 ]
Choi, Doo Ho [1 ]
Kim, Eun Seog [1 ]
Kwon, Soo Il [2 ]
机构
[1] Soonchunhyang Univ, Coll Med, Dept Radiat Oncol, Puchon, South Korea
[2] Kyonggi Univ, Dept Med Phys, Suwon, South Korea
[3] Natl Canc Ctr, Ctr Proton Therapy, Ilsan, South Korea
来源
WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING 2006, VOL 14, PTS 1-6 | 2007年 / 14卷
关键词
Electron density; CT number; Dose calculation;
D O I
暂无
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The CT numbers obtained from computed tomography (CT) are potentially useful for inhomogeneity correction in CT based treatment planning. The purpose of this study is to evaluate the variation of CT number from each scanner and the effect of this variation on photon dose calculations. Five kinds of CT scanners were used to obtain images of electron density calibration phantom (Gammex RMI 467). The images were transferred to treatment planning system (Pinnacle, USA) and drawing contour of each materials for obtaining the CT number. We obtained relationship between the CT numbers and electron densities from each CT scanner. In order to investigate the influence of CT number to dose calculation, patients' thoracic CT images were used. Difference of dose was evaluated with organ (Heart, Esophagus, Tumor, Lung, Liver, Vertebra body). The differences between CT numbers for each scanner were +/-2% in homogeneous medium and 9.5% in high density medium. The maximum dose difference was 0.48% for each organ. It acquired the phantom images inserted high density material in the water phantom. Comparing the doses calculated with CT images from each CT scanner, the maximum dose difference was 2.1% in 20 cm. There was not significant difference of CT number and dose in general condition but it was different in high density medium. The exact density to CT number conversion according to CT scanner is required to minimize the uncertainty of dose depends on CT number. Especially the each hospital with various CT scanners has to discriminate CT numbers for each CT scanner. Moreover a periodic quality assurance is required for reproducibility of CT number.
引用
收藏
页码:1984 / +
页数:2
相关论文
共 50 条
  • [31] Calculation of dose reduction by tube current modulation in pediatric CT
    Schmidt, B
    Greess, H
    Wolf, H
    Kalender, WA
    RADIOLOGY, 2001, 221 : 365 - 366
  • [32] Effects of the Difference in Tube Voltage of the CT Scanner on Dose Calculation
    Rhee, Dong Joo
    Kim, Sung-woo
    Jeong, Dong Hyeok
    Moon, Young Min
    Kim, Jung Ki
    JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2015, 67 (01) : 123 - 128
  • [33] Dose calculation using megavoltage cone beam CT imaging
    Morin, O
    Chen, J
    Aubin, M
    Bose, S
    Gillis, A
    Bocci, M
    Pouliot, J
    INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 2005, 63 (02): : S62 - S63
  • [34] Development and evaluation of methods for dose calculation in Conebeam-CT
    Richter, A.
    Baier, K.
    Steglich, D.
    Wilbert, J.
    Flentje, M.
    STRAHLENTHERAPIE UND ONKOLOGIE, 2008, 184 : 95 - 95
  • [35] Dose calculation on megavoltage CT in carbon ion beam therapy
    Ecker, S.
    Ellerbrock, M.
    Ackermann, B.
    Lissner, S.
    Schubert, K.
    Herfarth, K.
    Jaekel, O.
    STRAHLENTHERAPIE UND ONKOLOGIE, 2011, 187 (10) : 681 - 681
  • [36] Monte carlo calculation of internal dose based on SPECT/CT
    Ahunbay, E.
    Steinfelds, E.
    Hellman, R.
    Peng, C.
    Li, X.
    MEDICAL PHYSICS, 2007, 34 (06) : 2568 - 2568
  • [37] Dose calculation using megavoltage cone-beam CT
    Morin, Olivier
    Chen, Josephine
    Aubin, Michele
    Gillis, Amy
    Aubry, Jean-Francois
    Bose, Supratik
    Chen, Hong
    Descovich, Martina
    Xia, Ping
    Pouliot, Jean
    INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 2007, 67 (04): : 1201 - 1210
  • [38] The impact of the CT scanner calibration curve on the calculation of dose distribution
    Pawalowski, B.
    Adamczyk, S.
    Adamczyk, M.
    RADIOTHERAPY AND ONCOLOGY, 2014, 111 : S264 - S265
  • [39] DOSE CALCULATION AND MEASUREMENTS FOR A CT COMPATIBLE VERSION OF THE FLETCHER APPLICATOR
    WEEKS, KJ
    DENNETT, JC
    INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 1990, 18 (05): : 1191 - 1198
  • [40] Evaluation of Dose Calculation Based On Cone-Beam CT
    Abe, T.
    Tateoka, K.
    Fujimoto, K.
    Nakazawa, T.
    Saitou, Y.
    Nakata, A.
    Yano, M.
    Sakata, K.
    MEDICAL PHYSICS, 2014, 41 (06) : 259 - 259