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Effect of Head Positioning in Panoramic Radiography on the Vertical and Horizontal Magnification : Displacement along the Sagittal and Transverse Plane

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ÀÌ¿µ±Õ ( Lee Young-Kyun ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø ±¸°­»ýÈ­Çб³½Ç
¾È¼­¿µ ( An Seo-Young ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø ±¸°­¾Ç¾È¸é¹æ»ç¼±Çб³½Ç

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº ȯÀÚÀÇ ¸Ó¸® À§Ä¡¿¡ µû¸¥ Æijë¶ó¸¶¹æ»ç¼±»çÁøÀÇ ¼öÆò ¹× ¼öÁ÷ È®´ëÀ²À» ºñ±³ Æò°¡ÇÏ´Â °ÍÀ̾ú´Ù. Á÷°æ 4 mmÀÎ ±Ý¼Ó±¸¸¦ °ÇÁ¶ µÎ°³°ñÀÇ ÇÏ¾Ç ÀüÄ¡ºÎ¿Í ¿ìÃø ´ë±¸Ä¡ºÎÀÇ Ä¡Á¶°ñ »ó¹æ¿¡ À§Ä¡½ÃÄ×´Ù. ¼öÆò¹× ¼öÁ÷Àû À§Ä¡ÀÇ º¯È­¸¦ ÀçÇöÇϱâ À§ÇØ ¼öÁ÷, ¼öÆò À̵¿·®À» Á¶ÀýÇÒ ¼ö ÀÖ´Â µÎ°³°ñ °íÁ¤ÀåÄ¡¸¦ ÀÌ¿ëÇÏ¿©, Àü¹æ, ÈĹæ, ÁÂÃø ¹× ¿ìÃøÀ¸·Î À̵¿½ÃŲ ÈÄ Æijë¶ó¸¶¹æ»ç¼±»çÁøÀ» OP-100D¸¦ ÀÌ¿ëÇÏ¿© ȹµæÇÏ¿´´Ù. ÃÔ¿µµÈ ¿µ»óÀº DICOM Çü½ÄÀ¸·Î ÀúÀåµÇ¾ú°í, INFINITT PACS software¸¦ ÀÌ¿ëÇÏ¿© ±Ý¼Ó±¸ÀÇ Æø°ú ³ôÀÌÀÇ Æò±Õ°ªÀ» ±¸ÇÏ¿´´Ù. ÀûÀýÇÑ À§Ä¡¿¡¼­ ÃÔ¿µµÈ Æijë¶ó¸¶¹æ»ç¼±»çÁø¿¡¼­ ±Ý¼Ó±¸ÀÇ ¼öÆò È®´ëÀ²Àº 1.224 - 1.439¿´°í, ¼öÁ÷ È®´ëÀ²Àº1.286 - 1.345¿´´Ù. °ÇÁ¶ µÎ°³°ñÀÇ À§Ä¡ º¯È­¿¡ µû¸¥ ¼öÆò È®´ëÀ²Àº 0.798 - 6.297·Î Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÎ ¹Ý¸é(P<0.05), ¼öÁ÷ È®´ëÀ²Àº 1.245 - 1.418 Á¤µµ·Î ¼öÆò È®´ëÀ²¿¡ ºñÇØ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù

The purpose of this study was to investigate how image magnification in dental panoramic radiography is influenced by object position. Five metal balls (4 mm in diameter, 2 for the anterior and 3 for the posterior region on the right side)were placed above alveolar crest of dry skull considering extraction socket and dental arch. Dry skull was radiographed using OP-100D (Instrumentarium Imaging Co., Tuusula, Finland) at proper and displaced position along the sagittal and transverse plane at 3 mm, 6 mm, 9 mm, 12 mm and 15 mm using special mount which can control precise movement. Images were stored in DICOM files and were measured by ruler equipped within INFINITT PACS software (Infinitt Co.,Ltd., Seoul, Korea). The mean horizontal magnification was 1.224 - 1.439 and mean vertical magnification was 1.286 -1.345 at proper position. Vertical magnification resulted in less variation (1.245 - 1.418) than horizontal magnification (0.798 - 6.297) according to the sagittal and transverse displacements. Head positioning is important for linear measurement on panoramic radiography and inclusion of standard object (for instance, metal ball) is helpful to anticipate exact magnification of panoramic radiographs at various location.

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Head position; Magnification; Panoramic radiography

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