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ParaffinÀ» ÀÌ¿ëÇÑ Thyroid PhantomÁ¦ÀÛ¿¡ µû¸¥ À¯¿ë¼º¿¡ °üÇÑ ¿¬±¸

A study on the Effectivness of Hand-made Paraffin Thyroid Phantom

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¹Ú¼º¿Á ( Park Soung-Ock ) - µ¿³²º¸°Ç´ëÇÐ ¹æ»ç¼±°ú
ÀÌÀÎÀÚ ( Lee In-Ja ) - µ¿³²º¸°Ç´ëÇÐ ¹æ»ç¼±°ú

Abstract

¹æ»ç¼ºÀǾàǰÀ» ÀÌ¿ëÇÑ ÇÙÀÇÇÐÀû ¿µ»ó±â·Ï¿¡ ÀÖ¾î Àå±â°¡ ÇÔÀ¯Çϰí ÀÖ´Â Á¤º¸·®À» ÃÖ´ëÇÑ ¹¦Ãâ½ÃÄÑ ¾çÁúÀÇ Áø´ÜÁ¤º¸¸¦ Á¦°øÇØ¾ß ÇÑ´Ù´Â °ÍÀº ¸Å¿ì Áß¿äÇÏ´Ù. ±×°ÍÀ» À§ÇÑ ±â¼úÀûÀÎ ¹®Á¦¸¦ ºñ·ÔÇÏ¿© Àåºñ¼º´ÉÀÇ À¯Áö°ü¸®¿¡ ¸¹Àº ³ë·ÂÀ» ±â¿ïÀ̰í ÀÖÀ¸¸ç, ´Ù¾çÇÑ Á¾·ù·Î »ó¾÷È­µÇ¾î ÀÌ¿ëµÇ°í ÀÖ´Â ¿ì¼öÇÑ phantomµéÀÌ »ç¿ëµÇ°í ÀÖ´Ù. º» ¿¬±¸¿¡¼­ ÀÎüÀÇ ¿¬ºÎÁ¶Á÷°ú ¸Å¿ì Èí»çÇÑ ¹°¸®Àû Á¶°ÇÀ» °¡Áö°í ÀÖÀ¸¸ç ±¸ÀÔÇϱ⠽¬¿î ParaffinÀ» ÀÌ¿ëÇÏ¿© ±âÁ¸¿¡ »ç¿ëµÇ°í ÀÖ´Â acryl thyroid phantom°ú µ¿ÀÏÇÏ°Ô paraffin phantomÀ» Á¦ÀÛÇÏ¿´À¸¸ç, ÆÇ¸ÅµÇ°í ÀÖ´Â acryl thyroid phantom¿¡¼­ ÃøÁ¤ÇÒ ¼ö ÀÖ´Â °Í º¸´Ù ´õ ³ôÀº ºÐÇØ´ÉÀ» ÃøÁ¤ÇÒ ¼ö ÀÖµµ·Ï ÀÛÀº 3mm¿Í 6mm Á÷°æÀÇ cold area¸¦ »ðÀÔÇÑ paraffin thyroid phantomÀ» ¼öÀÛ¾÷À¸·Î Á¦ÀÛÇÏ¿´´Ù. ¹æ»ç¼ºÀǾàǰ ¸¦ ÀÌ¿ëÇϰí pinhole collimator¸¦ ÀÌ¿ëÇÏ¿© »ó¾÷È­µÇ¾î »ç¿ëµÇ°í ÀÖ´Â acryl thyroid phantom°ú º» ¿¬±¸¸¦ À§ÇÏ¿© Á¦ÀÛÇÑ paraffin thyroid phantomÀÇ Æ¯¼ºÀ» ºñ±³ ºÐ¼®ÇÑ °á°ú paraffinÀ» ÀÌ¿ëÇÑ phantomµµ »ó¾÷È­µÇ¾î »ç¿ë ÁßÀÎ acryl thyroid phantom°ú µ¿ÀÏÇÑ ¹°¸®Àû Ư¼ºÀ» À¯ÁöÇϰí, ¿ÀÈ÷·Á ºÐÇØ´ÉÀÌ ³ôÀº ºÎºÐÀ» ÃøÁ¤ÇÒ ¼ö ÀÖ°í ¿¬ºÎÁ¶Á÷ÀÇ Æ¯¼ºÀ» ¿¬±¸ÇÒ ¼ö ÀÖ´Â µî°¡¹°Áú·Î¼­ ±¸ÀÔÇϱ⠽±°í Á¦ÀÛÀÌ ¼ö¿ùÇÑ ÀåÁ¡À» ºñ·ÔÇÏ¿© °æÁ¦¼ºÀÌ ÀÖÀ½À» Áõ¸íÇÏ´Â °è±â°¡ µÇ¾ú´Ù.

Phantoms are very necessary for quality assurance of radio nuclides imaging systems to maintain standards and to ensure reproducibility of test. General quality assurance and instrument quality control are essential in every hospital. The human tissue equivalent materials are aluminum, areryl, water and epoxy..etc. It is very important to select optimum equivalant materials for a phantoms in QC. Especially, paraffin is very similar with human soft tissue in X or Gamma-ray physical characteristics and easy to buy with economically. We made a paraffin thyroid phantom and compare with thyroid areryl phantom, also used commercially in practice. Two small size cold spots(3 and 6 mm diameter) and a hot spot(3 mm diameter) embeded in paraffin phantom. And imaged with by camera for analysis about spatial resolution and noise at the hot and cold spots. We got some results as below : 1. No difference in counting rate and noise between both arcryl and paraffin thyroid phantoms. 2. The best spatial resolution can be seen 6 cm distance between pinhole collimator and thyroid phantoms(arcryl and paraffin). 3. More optimal spatial resolution could acquired in paraffin thyroid phantom. Paraffin is very similar with human soft tissue in atomic number, density and relative absorbtion function, and can be shaped easily what we wanted. So we can recommendation paraffin as quality assurance phantom because its usefulness, economical benefit and purchasability.

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Phantom; Quality assurance; usefulness; purchasability; acryl thyroid phantom; paraffin thyroid phantom

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