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¼­¿ï´ëÇб³º´¿øÇü ¹æ»ç¼±¼ö¼ú Ç¥Áرâ¹ýÀÇ Áß½ÉÁ¡ ¼±·®ÀÇ ¿ÀÂ÷ Radiation Dose Accuracy at the Isocenter: Standard Stereotactic Radiosurgery Technique Developed at Seoul National University Hospital

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½Å¼º¼ö/Seong Soo Shin ±èÀÏÇÑ/ÇϼºÈ¯/¹ÚÂùÀÏ/°­À§»ý/Çã¼ø³ç/Il Han Kim/Sung Whan Ha/Charn Il Park/Wee Saing Kang/Sun Nyung Hur

Abstract

¸ñÀû: ¼­¿ï´ëÇб³º´¿ø¿¡¼­ °³¹ßÇÑ Á¤À§¹æ»ç¼±¼ö¼ú ½Ã½ºÅÛ¿¡¼­ÀÇ Ç¥ÁØÀû Á¤À§¹æ»ç¼±¼ö¼ú±â¹ýÀ» Àû¿ë½Ã Áß½ÉÁ¡¿¡¼­ÀÇ ¹æ»ç¼±·® ¿ÀÂ÷¸¦ È®ÀÎÇÏ°íÀÚ ÇÏ¿´´Ù.

Àç·á ¹× ¹æ¹ý: ³»°æ 10 §® ¹× 20 §®ÀÎ ¿øÅëÇüÀÇ 3Â÷ Äݸ®¸ÞÀÌÅ͸¦ ÀåÂøÈÄ 5°³ÀÇ È£Çü(arc)À¸·Î ±¸¼ºµÈ Ç¥ÁØÇü Á¤À§¹æ»ç¼±¼ö¼ú°èȹ¿¡ µû¶ó ½ÃÇàÇÑ Á¤À§¹æ»ç¼±¼ö¼ú½ÃÀÇ ¼±·®À» ÃøÁ¤ÇÏ¿´´Ù. ¹æ»ç¼±Àº CL2100C ¼±Çü°¡¼Ó±â¿¡¼­ ¹ß»ýÇÏ´Â 6 §Æ X-¼±À» »ç¿ëÇÏ¿´°í
ÀÚü
°³¹ßÇÑ ´Ù¿ëµµ ÆÒÅè¿¡¼­ 0.125 §¦ Àü¸®ÇÔ ¹× ´ÙÀÌ¿Àµå °ËÃâ±â·Î Áß½ÉÁ¡ ¼±·®À» ÃøÁ¤ÇÏ¿´´Ù.

°á°ú: ³»°æ 20 §®ÀÎ 3Â÷ Äݸ®¸ÞÀÌÅ͸¦ ÀåÂøÇÑ Á¤À§¹æ»ç¼±¼ö¼ú ½ÃÇà½Ã È£Çü¿¡ µû¸¥ °èȹ¼±·®°ú ÃøÁ¤¼±·® °£ ¿ÀÂ÷´Â 0.125 §¦ Àü¸®ÇÔ ÃøÁ¤½Ã -0.73% ³»Áö -2.69%, ´ÙÀÌ¿Àµå °ËÃâ±â ÃøÁ¤½Ã -1.29% ³»Áö -2.91%À̾ú´Ù. ³»°æ 10 §®ÀÎ 3Â÷ Äݸ®¸ÞÀÌÅÍ ÀåÂøÇÑ
°æ¿ìÀÇ
¿ÀÂ÷´Â ´ÙÀÌ¿Àµå °ËÃâ±â·Î ÃøÁ¤ÇÏ¿´À» ¶§ -2.39% ³»Áö -4.25%À̾ú´Ù.

°á·Ð: Áß½ÉÁ¡ ¼±·® ¿ÀÂ÷´Â ¾à 3% Á¤µµ·Î¼­ DICOM 3.0 Ç¥ÁØÇü½ÄÀ» ÅëÇÑ ¿µ»óÀÚ·á ó¸® µîÀÇ °³¼±Ã¥À» ÅëÇÑ ÃÖ¼ÒÈ­ ³ë·ÂÀÌ ÇÊ¿äÇÏ´Ù.

Purpose: To confirm the accuracy of the radiation dose at the isocenter by the standard linear accelerator-based stereotactic radiosurgery technique which was developed at Seoul National University Hospital.

Materials and Methods: Radiation dosimetry was undertaken during standard 5-arc radiosurgery using 6 §Æ X-ray beam from CL2100C linac. The treatment head was attached with circular tertiary collimators of 10 and 20 §® diameter. We measured
the
absorbed dose at the isocenter of a multi-purpose phantom using two kinds of detector:a 0.125 §¦ ionization chamber and a silicon diode detector.

Results: The dose differences at each arc plane between the planned dose and the measured dose at the isocenter raged from -0.73% to -2.69% with the 0.125 §¦ ion chamber, and from -1.29% to -2.91% with the diode detector during radiosurgery
with
the tertiary collimator of 20 §® diameter. Those with the 10-§® tertiary collimator ranged from -2.39% to -4.25% with the diode.

Conclusion: The dose accuracy at the isocenter was ¡¾3%. Therefore, further efforts such as modification in processing of the archived image through DICOM3.0 format are required to lessen the dose difference.

Å°¿öµå

Á¤À§¹æ»ç¼±¼ö¼ú; ´Ù¿ëµµ ÆÒÅè; Áß½ÉÁ¡ ¼±·®; Stereotatic radiosurgery; Multi-purpose phantom; Isocenter dose;

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