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KMID : 1164220170290020075
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Journal of Korean Society for Radiotherapeutic Technology
2017 Volume.29 No. 2 p.75 ~ p.81
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Reproducibiity of setup error for prostate cancer by ultrasound image-guided radiation therapy
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Park Sung-Yong
Lim Seung-Kyu
Si Myoung-Geun
Lee Ji-Hae
Kim Jong-Yeol
Cho Eun-Ju
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Abstract
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Purpose: To evaluate the reproducibility of image-guided radiotherapy using ultrasonography which is non-invasive, without radiation exposure for prostate cancer patients.
Materials and Methods: We analyzed the setup variation of 1,105 images for 26 prostate cancer patients and the mean, standard deviation and 3D-error in AP, RL and SI directions. Setup variations were classified 0-1 mm, 1-3 mm, 3-5 mm, 5 mm and more.
Results: The mean and standard deviation of setup variation in AP, RL and SI directions was 1.87±1.36 mm, 1.73±1.22 mm and 2.01±1.40 mm. The 3D-error in AP, RL and SI directions was 3.63±1.63 mm. The frequency of setup variation in AP direction was 29 % in the range from 0 mm to 1 mm, 50.2 % in the range from 1 mm to 3 mm, 19.6 % in the range from 3 mm to 5 mm and 1.3 % in the range of 5 mm or more. In RL direction, the frequency was 31.3 % in the range from 0 mm to 1 mm, 52.5 % in the range from 1 mm to 3 mm, 15.8 % in the range from 3 mm to 5 mm and 0.5 % in the range of 5 mm or more. SI direction, the frequency of errors in the range from 0 mm to 1 mm was 26.3 %, 50.2 % in the range from 1 mm to 3
mm, 22.4 % in the range from 3 mm to 5 mm, and 1.1 % in the range of 5 mm or more.
Conclusion: The setup error was highest in the SI direction of 2.01±1.40 mm. The frequency in each direction was the highest in more than 50 % in the range from 1 mm to 3 mm. ClarityTM Auto scan is possible to monitoring the motion of the prostate during the treatment and to repositioning the patient.
In conclusion real-time image-guided radiotherapy using ultrasonography will be increase the
reproducibility of radiation therapy.
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KEYWORD
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Prostate cancer , Image-guided radiotherapy , Ultrasonography , Setup variation
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