Radiation Oncology, Chulolongkorn University : Medium Dose Rate (MDR) Brachytherapy

Radiation Oncology Chulolongkorn University

Medium Dose Rate (MDR) Brachytherapy

à¹×èÍ§¨Ò¡¡ÒÃãªéáÃèàÃà´ÕÂÂÁ-226 à»ç¹áËÅè§¾ÅÑ§§Ò¹ÃÑ§ÊÕã¹¡ÒÃãÊèáÃè¼Ùé»èÇÂ ÁÕ¢éÍàÊÕÂà»ÃÕÂº¤×Í
µÑÇá·è§áÃèáÅÐà¤Ã×èÍ§Á×ÍÁÕ¢¹Ò´àÊé¹¼èÒÈÙ¹Âì¡ÅÒ§ãËè à»ç¹ preloading áÅÐ/ËÃ×Í manual loading system
·ÓãËéÁÕ radiation hazard µèÍá¾·ÂìáÅÐà¨éÒË¹éÒ·Õè¼Ùé»¯ÔºÑµÔ§Ò¹ä´é ¡ÒÃ»éÍ§¡Ñ¹ÃÑ§ÊÕ·Óä´éÅÓºÒ¡ áÅÐáÃèàÃà´ÕÂÁ
àÁ×èÍÊÅÒÂµÑÇ¨ÐãËé¡ÑÁÁÑ¹µÀÒ¾ÃÑ§ÊÕ Radon-222 «Öè§à»ç¹¡êÒ«·ÕèÁÍ§äÁèàËç¹´éÇÂµÒà»ÅèÒ ¹Í¡¨Ò¡¹Ñé¹
¼Ùé»èÇÂµéÍ§ãªéàÇÅÒã¹¡ÒÃÃÑ¡ÉÒ¹Ò¹¤ÃÑé§ÅÐ 48-72 ªÑèÇâÁ§
´Ñ§¹Ñé¹µÑé§áµèà´×Í¹¾ÄÉÀÒ¤Á 2528 Ë¹èÇÂÃÑ§ÊÕÃÑ¡ÉÒ ¤³Ðá¾·ÂÈÒÊµÃì ¨ØÌÒÅ§¡Ã³ìÁËÒÇÔ·ÂÒÅÑÂ
ä´é¹Óà¤Ã×èÍ§ Selectron «Öè§à»ç¹ Remote control after loading system â´ÂãªéáÃè«Õà«ÕÂÁ-137 (Cesium-137)
à»ç¹áËÅè§¾ÅÑ§§Ò¹¢Í§ÃÑ§ÊÕã¹¡ÒÃãÊèáÃè á·¹áÃèàÃà´ÕÂÁ-226 ·ÕèãªéÍÂÙèà´ÔÁ â´Âã¹ÃÐÂÐàÃÔèÁáÃ¡ÁÕ dose rate
·Õè point A à·èÒ¡Ñº 200 cGy/hr 54 «Öè§ÍÒ¨¨Ñ´ÇèÒà»ç¹ medium dose rate (MDR) machine àÁ×èÍà»ÃÕÂºà·ÕÂº
¡Ñº¡ÒÃãªéáÃèàÃà´ÕÂÁ-226 «Öè§à»ç¹ low dose rate (LDR) ¤×ÍÁÕ dose rate ·Õè point A »ÃÐÁÒ³ 53 cGy/hr 52,53
¢éÍ´Õ¢Í§à¤Ã×èÍ§ Selectron ¡ç¤×ÍµÑÇáÃèáÅÐà¤Ã×èÍ§Á×ÍÁÕ¢¹Ò´àÅç¡ (¢¹Ò´àÊé¹¼èÒÈÙ¹Âì¡ÅÒ§´éÒ¹¹Í¡
6 ÁÔÅÅÔàÁµÃ) ¡ÒÃ»éÍ§¡Ñ¹ÃÑ§ÊÕ·Óä´é 100% à¹×èÍ§¨Ò¡à»ç¹ remote control after loading system ÃÐÂÐàÇÅÒ
¡ÒÃãÊèáÃèã¹¼Ùé»èÇÂÊÑé¹¡ÇèÒ ãªéàÇÅÒÃÑ¡ÉÒ¤ÃÑé§ÅÐ»ÃÐÁÒ³ 10-12 ªÑèÇâÁ§ à¹×èÍ§¨Ò¡ dose rate ·ÕèÊÙ§¢Öé¹
»Ñ¨¨ØºÑ¹¡ÒÃãÊèáÃè´éÇÂà¤Ã×èÍ§Á×Í Selectron ¹Õé ¡ÓË¹´ãËé»ÃÔÁÒ³ÃÑ§ÊÕÃÇÁÊÙ§ÊØ´·Õè Point A äÁèà¡Ô¹
7,500 cGy ¨ÐàËç¹ÇèÒ total dose ·Õè point A µèÓ¡ÇèÒ àÁ×èÍà·ÕÂº¡Ñº¡ÒÃãªéáÃèàÃà´ÕÂÁ - 226 ·Ñé§¹Õéà»ç¹¼Å¨Ò¡
dose rate ·ÕèÊÙ§¢Öé¹ «Öè§¨ÐÁÕ¼ÅµèÍà¹×éÍÁÐàÃç§áÅÐà¹×éÍàÂ×èÍ»¡µÔÁÒ¡¢Öé¹55-57 ÊèÇ¹¢Ñé¹µÍ¹¡ÒÃãÊèáÃè¹Ñé¹àËÁ×Í¹¡Ñº
¡ÒÃãÊèáÃèàÃà´ÕÂÁ - 226 ·Ø¡»ÃÐ¡ÒÃ
á¹Ç¹âÂºÒÂ¡ÒÃãÊèáÃè´éÇÂà¤Ã×èÍ§ Selectron ã¹¼Ùé»èÇÂÁÐàÃç§»Ò¡Á´ÅÙ¡¢Í§ÊÒ¢ÒÃÑ§ÊÕÃÑ¡ÉÒ
âÃ§¾ÂÒºÒÅ¨ØÌÒÅ§¡Ã³ì áÊ´§´Ñ§µÒÃÒ§·Õè 7

µÒÃÒ§·Õè 7 ¡ÒÃÃÑ¡ÉÒÁÐàÃç§»Ò¡Á´ÅÙ¡´éÇÂ¡ÒÃ©ÒÂÃÑ§ÊÕ¨Ò¡ÀÒÂ¹Í¡áÅÐ¡ÒÃãÊèáÃè«Õà«ÕÂÁ - 137
¢Í§âÃ§¾ÂÒºÒÅ¨ØÌÒÅ§¡Ã³ì

Whole pelvic XRT (Gy)	Brachytherapy (Cs-137) (Gy)	Total doses Point A (Gy)	Total dose Point B (Gy)
20 Gy	27.5 Gy x 2F	75 Gy	Vary as in Ra-226 technic
30 Gy	22.5 Gy x 2F	75 Gy	Vary as in Ra-226 technic
40 Gy	17.5 Gy x 2F	75 Gy	Vary as in Ra-226 technic
50 Gy	25.0 Gy x 1F	75 Gy	Vary as in Ra-226 technic

ÊÓËÃÑº¼Å¢Í§¡ÒÃÃÑ¡ÉÒµÒÁ¹âÂºÒÂ·ÕèÇÒ§äÇé´Ñ§¡ÅèÒÇ ¾ºÇèÒäÁèÇèÒ¨Ðãªé¡ÒÃÃÑ¡ÉÒ´éÇÂ¡ÒÃãÊèáÃè
àÃà´ÕÂÁ - 226 ËÃ×ÍáÃè«Õà«ÕÂÁ - 137 ¼Å¡ÒÃÃÑ¡ÉÒã¹´éÒ¹¡ÒÃ¤Çº¤ØÁâÃ¤à©¾ÒÐ·Õè áÅÐÍÑµÃÒ¡ÒÃÁÕªÕÇÔµÃÍ´
¨Ò¡¡ÒÃÃÑ¡ÉÒ ä´é¼Åã¡Åéà¤ÕÂ§¡Ñ¹ äÁèÁÕ¤ÇÒÁáµ¡µèÒ§·Ò§Ê¶ÔµÔ ¹Í¡¨Ò¡¹Ñé¹ÀÒÇÐá·Ã¡«éÍ¹·Õèà¡Ô´¢Öé¹¨Ò¡
¡ÒÃÃÑ¡ÉÒ´éÇÂÇÔ¸Õ¡ÒÃ·Ñé§ 2 ¡çã¡Åéà¤ÕÂ§¡Ñ¹ (33,58)

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Last modified on 25 October 1996