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°£¾Ï¿¡¼­ È£ÈíÁֱ⸦ °í·ÁÇÑ 2-Â÷¿ø ¹æ»ç¼± Ä¡·á¹æ¹ý°ú ÀÔüÁ¶Çü Ä¡·á¹æ¹ý¿¡¼­ ¹æ»ç¼± °£¿° ¿¹ÃøÀÇ ºñ±³¿¬±¸ Comparative Study Between Respiratory Gated Conventional 2-D Plan and 3-D Conformal Plan for Predicting Radiation Hepatitis

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Abstract

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È£ÈíÇϸ鼭 °èȹµÈ 3-Â÷¿ø ÀÔüÁ¶ÇüÄ¡·á¿¡¼­ Á¤»ó°£°ú ÁÖº¯Á¤»óÀå±âÀÇ ¼±·®Ã¼ÀûÈ÷½ºÅä±×¶÷
°ú normal tissue complication probability(NTCP)¸¦ ºñ±³ÇÏ¿´´Ù.
°á °ú : °£ÀÇ È£Èí¿¡ ÀÇÇÑ »óÇÏ ¿îµ¿¹üÀ§´Â 2-3§¯ À̾ú°í È£ÈíÁֱ⿡ µû¸¥ ±âÁ¸ÀÇ 2Â÷¿ø
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Àû°ú ÀÜ¿©Á¤»ó°£, ÁÖº¯Á¤»óÀå±âÀÇ ¼±·®Ã¼ÀûÈ÷½ºÅä±×¶÷ÀÇ ¶Ñ·ÇÇÑ Â÷ÀÌ´Â °üÂûÇÒ ¼ö ¾ø¾ú´Ù.
¶ÇÇÑ Á¤°­ÀÜ ¿©°£ÀÇ NTCPÀÇ Â÷À̵µ °üÂûÇÒ ¼ö ¾ø¾ú´Ù.
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Purpose : To evaluate influences associated with radiation treatment planning obtained
with the patient breathing freely.
Material and Methods : We compared reduction or elimination of planning target
volume (PTV) margins with 2-D conventional plan with inclusion of PTV margins
associated with breathing with 3-D conformal therapy. The respiratory non gated 3-D
conformal treatment plans were compared with respiratory gated conventional 2-D plans
in 4 patients with hepatocellular carcinomas. Isodose distribution. dose statistics, and
dose volume histogram (DVH) of PTVs were used to evaluate differences between
respiratory gated conventional 2-D plans and respiratory non gated 3-D conformal
treatment plans. In addition. the risk of radiation exposure of surrounding normal liver
and organs are evaluated by means of DVH and normal tissue complication probabilities
(NTCPs).
Results : The vertical movement of liver ranged 2-3 cm in all patients. We found no
difference between respiratory gated 2-D plans and 3-D conformal treatment plans with
the patients breathing freely. Treatment planning using DVH analysis of PTV and the
normal liver was used for all patients. DVH and calculated NTCP showed no difference
in respiratory gated 2-D plans and respiratory non gated 3-D conformal treatment plans.
Conclusion : Respiratory gated radiation therapy was very important in hepatic tumors
because radiation induced hepatitis was dependent on remaining normal liver volume.
Further investigational studies for respiratory gates radiation treatment combined with
3-D conformal treatment are required.

Å°¿öµå

3-D conformal therapy; Hepatocellular carcinoma;

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