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KMID : 0357520110340040341
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Journal of Radiological Science and Technology
2011 Volume.34 No. 4 p.341 ~ p.349
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Consideration on Measured Patients Dose of Three-Dimensional and Four-Dimensional Computer Tomography when CT-Simulation to Radiation Therapy
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Park Ryeung-Hwang
Kim Min-Jung
Lee Sang-Kyu
Park Kwang-Woo
Jeon Byeong-Cheol
Cho Jung-Heui
Yoo Beong-Gyu
Lee Jong-Seok
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Abstract
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This study was to measure the patient dose difference between 3D treatment planning CT and 4D respiratory gating CT. Study was performed with each 10 patients who have lung and liver cancer for measured patient exposure dose by using SOMATON SENSATION OPEN(SIMENS, GERMANY). CTDIvol and DLP value was used to analyze patient dose, and actual dose was measured in the location of liver and kidney for abdominal examination and lung, heart and spinal cord for chest examination. Rando phantom were used for the experiment. OSLD was used for in-vitro and in-vivo dosimetry. Increasing overall actual dose in 4D respiratory gated CT-simulation using OSLD increase the dose by 5.5 times for liver cancer patients and 6 times for lung cancer patients. In CT simulation of 10 lung cancer patients, CTDIvol value was increased by 5.7 times and DLP 2.4 times. For liver cancer patients, CTDIvol was risen by 3.8 times and DLP 1.6 times. The accuracy of treatment volume could be increased in 4D CT planning for position change due to the breaths of patient in the radiation therapy. However, patients dose was increased in 4D CT than 3D CT. In conclusion, constant efforts is required to reduce patients dose by reducing scan time and scan range.
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KEYWORD
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4DCT, OSLD, CTDIvol, DLP, Radiation dose
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