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J Korean Soc Ther Radiol Oncol > Volume 17(3); 1999 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 1999;17(3): 261-267.
The Comparison of DVH between Multiple arc FSRT and Conformal FSRT
Ki Hwan Kim, Jun Sang Kim, Ji Young Jang, Jae Sung Kim, Seong Ho Kim, Chang Joon Song, Min Kyu Park, Moon June Cho
1Department of Therapeutic Radiology, Chungnam National University Hospital, Taejon, Korea.
2Department of Neurosurgery, Chungnam National University Hospital, Taejon, Korea.
3Department of Diagnostic Radiology, Chungnam National University Hospital, Taejon, Korea.
4Department of Physics, College of Natural Science, Chungbuk National University, Cheongju, Korea.
ABSTRACT
PURPOSE:
.In FSRT (Fractionated stereotactic radiotherapy) planning, we studied the usefulness between multiple arc FSRT and conformal FSRT by comparing tumor shape and DVH(dose volume histogram). MATERIALS AND METHDS: In Chungnam Univ. hospital, we had treated the sixteen patients with FSRT from Aug. 1997 to Dec. 1998. In choosing multiple arc FSRT or conformal FSRT, we had considered multiple arc FSRT if tumor shape was similar to sphere or the value of IF was less than 1.25, conformal FSRT if tumor shape was very irregular or IF was more than 1.3. For evaluation of treatment planning, we had considered the appropriate DVH for tumor volume and for critical organs.
RESULT:
The errors between reference point and the coordinates point on AP, Lat radiography were less than 1 mm before treatment. We had planned 3~5 arcs for multiple arc FSRT, 5~6pots for conformal FSRT. The mean dose distribution of tumor volume of cumulative DVH between multiple arc FSRT and conformal FSRT was 90.6, 86%, respectively. The dose of critical organs irradiated was less than 5% maximum dose of cumulative DVH.
CONCLUSION:
We had obtained the similar value between multiple arc FSRT and conformal FSRT, so that we had appropriate treatment planning of FSRT for multiple arc FSRT and conformal FSRT according to tumor shape and size.
Key Words: FSRT, Conformal FSRT, DVH
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