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Multiple arc FSRT¿Í Conformal FSRTÀÇ DVH ºñ±³ The Comparison of DVH between Multiple arc FSRT and Conformal FSRT

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±è±âȯ/Ki Hwan Kim ±èÁØ»ó/ÀåÁö¿µ/±èÀ缺/±è¼ºÈ£/¼ÛâÁØ/¹Ú¹Î±Ô/Á¶¹®ÁØ/Jun Sang Kim/Ji Young Jang/Jae Sung Kim/Seong Ho Kim/Chang Joon Song/Min Kyu Park/Moon June Cho

Abstract

¸ñ Àû : Multiple arc FSRT (fractionated stereotactic radiotherapy)¿Í conformal FSRTÀÇ
Ä¡·á°èȹ¿¡ À־ Á¾¾çÀÇ ¸ð¾ç°ú DVH (dose volume histogram)¸¦ ºñ±³ÇÏ¿© µÎ ±â¹ý°£ÀÇ
À¯¿ë¼º¿¡ ´ëÇÏ¿© ³íÇÏ°íÀÚ ÇÑ´Ù.
´ë»ó ¹× ¹æ¹ý : 16¸íÀÇ ³úÁ¾¾ç ȯÀÚµéÀ» ´ë»óÀ¸·Î 1997³â 8¿ùºÎÅÍ 1998³â 12¿ù±îÁö Ãæ³²
´ëÇб³º´¿ø Ä¡·á ¹æ»ç¼±°ú¿¡¼­ 112ȸÀÇ FSRT¸¦ ½Ç½ÃÇÏ¿´´Ù. Ä¡·á Àü ¸ðÀÇÄ¡·á¿¡¼­ ¾òÀº
AP(Anterior-posterior), Lateral Çʸ§»óÀÇ ±Ý¼ÓÇ¥ÁöÀÚÀÇ ÁÂÇ¥°ªÀ» ISOLOCÇÁ·Î±×·¥¿¡ ÀÔ·Â
ÇÏ¿© ¾òÀº ±âÁØÁ¡°úÀÇ ¿ÀÂ÷¸¦ È®ÀÎÇÑ ÈÄ Ä¡·á°èȹÀ» ÇÏ¿´´Ù. Ä¡·á°èȹÀº Á¾¾ç¿ëÀû°ú Á¾¾çÇ¥
¸éÀû¸¦ °è»êÇÑ ÈÄ IF (irregular factor)¸¦ °í·ÁÇÏ¿© multiple arc FSRT ȤÀº conformal
FSRT¸¦ ¼±ÅÃÇÏ¿´´Ù. Multiple arc FSRT´Â Á¾¾çÀÇ IF°ªÀÌ 1-1.2ÀÎ °æ¿ì¿¡ °í·ÁÇÏ¿´°í,
conformal FSRT´Â IF°ªÀÌ 1.3 ÀÌ»óÀÎ °æ¿ì¿¡ °í·ÁÇÑ ÈÄ Á¾¾ç¿ëÀû¿¡ ´ëÇÏ¿© ó¹æ¼±·® ÀÌ»ó
ÀÇ ¼±·®¿¡ ´ëÇÑ DVH°î¼±¿¡ ÀÇÇÑ ¸éÀûÀÌ ÃÖ¼ÒÀ̸鼭 ó¹æ¼±·® ÀÌÇÏÀÇ ¼±·®¿¡ ´ëÇÑ DVH°î
¼±¿¡ ÀÇÇÑ ¸éÀûÀÌ ÃÖ´ë°¡ µÇµµ·Ï ÇÏ´Â Ä¡·á°èȹÀ» ¼±ÅÃÇÏ¿© Æò°¡ÇÏ¿´´Ù.
°á °ú : Ä¡·áÀü ¸ðÀÇ Ä¡·á¿¡¼­ ½ÃÇàÇÑ ±Ý¼ÓÇ¥ÁöÀÚÀÇ ÁÂÇ¥°ªÀ» ISOLOCÇÁ·Î±×·¥¿¡ ÀÔ·ÂÇÏ
¿© ¾òÀº ±âÁØÁ¡°úÀÇ ¿ÀÂ÷´Â 1 §® À̳»¿´´Ù. Multiple arc FSRT´Â ´©ÀûDVH»ó¿¡¼­ ó¹æ¼±·®
ÀÇ 90, 91, 92, 93%¿¡¼­ Àüü Á¾¾ç¿ëÀûÀ» Æ÷ÇÔÇÏ°í ÀÖ¾úÀ¸¸ç Æò±Õ°ªÀº 90.6%À̾ú°í,
conformal FSRT ´Â ´©ÀûDVH»ó¿¡¼­ ó¹æ¼±·®ÀÇ 81, 85, 86, 87, 91%¿¡¼­ Àüü Á¾¾ç¿ëÀûÀ»
Æ÷ÇÔÇÏ°í ÀÖ¾úÀ¸¸ç Æò±Õ°ªÀº 86%À̾ú´Ù. µÎ ¹æ½Ä ¸ðµÎ °áÁ¤Àå±âµé¿¡´Â ÃÖ´ë¼±·®ÀÇ 5%ÀÌÇÏ
ÀÇ ÀûÀº ¼±·®ÀÌ Á¶»çµÇ¾ú´Ù.
°á ·Ð : Multiple arc FSRT¿Í conformal FSRT¸¦ IF¸¦ ±âÁØÀ¸·Î Ä¡·á °èȹÇÏ¿© ±¸ÇüÀÇ
Á¾¾ç¿¡ multiple arc FSRT¸¦ ½ÃÇàÇÏ¿´À¸¸ç, ºÒ±ÔÄ¢ÇÑ ¸ð¾çÀÇ Á¾¾ç¿¡´Â conformal FSRT¸¦
½ÃÇàÇÏ¿© Á¾¾çÀÇ ¸ð¾ç¿¡ °ü°è¾øÀÌ ÀûÀýÇÑ FSRTÄ¡·á°èȹÀ» ¼ö¸³ÇÒ ¼ö ÀÖ¾ú´Ù.

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 Methods : 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. IF (irregular factor) after calculating tumor volume
and surface area. 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.
Results : The errors between reference point and the coordinates point on AP, Lat
radiography were less than 1 §® before treatment. We had planned 3¡­5 arcs for
multiple arc FSRT, 5¡­Sports 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.

Å°¿öµå

FSRT; Conformal FSRT; DVH; FSRT; Conformal FSRT; DVH;

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