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KMID : 1164220080200010045
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Journal of Korean Society for Radiotherapeutic Technology
2008 Volume.20 No. 1 p.45 ~ p.53
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Experiences of the First 130 Patients in Gangnam Severance Hospital
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Ha Jin-Sook
Jeon Mi-Jin
Kim Sei-Joon
Kim Jong-Dae
Shin Dong-Bong
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Abstract
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Purpose: We are trying to analyze 130 patients’ conditions by using our Helical Tomotherapy, which was installed
in our center in Oct. 2007. We will be statistically approach this examination and analyze so that we will be able to figure out adaptive plans according to the change in place of the tumor, GTV (gross tumor volume), total amount of time it took, vector (υ=√ｘ2+ｙ2+ｚ2) and the change in size of the tumor.
Materials and Methods: Objectives were the patients who were medicated with Tomotherapy in our medical center since Oct. 2007 August 2008. The Average age of the patients were 53 years old (Minimum 25 years old, Maximum
83 years old). The parts of the body we operated were could be categorized as Head&neck (n=22), Chest (n=47), Abdomen (n=25), Pelvis (n=11), Bone (n=25). MVCT had acted on 2702 times, and also had acted on our adaptive plan toward patients who showed big difference in the size of tumor. Also, after equalizing our gained MVCT and kv-CT we checked up on the range of possible mistake, using x, y, z, roll and vector. We’ve also investigated on Set-up, MVCT, average time of operation and target volume.
Results: Mean time on table was 22.8 minutes. Mean treatment time was 13.26 minutes. Mean correction (mm)
was X=-0.7, Y=-1.4, Z=5.77, roll=0.29, vector=8.66 Head&neck patients had 2.96 mm less vector value in movement than patients of Chest, Abdomen, Bone. In increasing order, Head&neck, Bone, Abdomen, Chest, Pelvis showed the vector value in movement. Also, there were 27 patients for adaptive plan, 39 patients, who had long or multiple tumor. We could know that When medical treatment is one cure plan, it takes 32 minutes, and when medical treatment is two cure plan, it takes 40 minutes that one medical treatment takes 21 minutes, and the other medical treatment takes 19 minutes.
Conclusion: With our basic tools, we could bring more accurate IMRT with MVCT. Also, through our daily image, we checked up on the change in tumor so that adaptive plan could work. It was made it possible to take the cure
of long or multiple tumor, the cure in a nearby OAR, and the complicated cure that should make changes of gradient dose distribution.
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KEYWORD
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IGRT, MVCT, adaptive plan
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