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¸ðÀÇÄ¡·á(Simulation) ¿µ»óÀ» ÀÌ¿ëÇÑ Broad-beam CT ¿µ»ó ±¸Çö The Broad-beam CT Image Reconstruction from Simulator Images

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À̺´¿ë/Byong Yong Yi

Abstract

¸ñ Àû : Broad-beam Simulator-CT °³¹ßÀ» À§ÇÑ ¿¹ºñ¿¬±¸·Î¼­ Åë»óÀÇ ¸ðÀÇ Ä¡·á ¿µ»ó¿¡
¼­ Ãà»ó¸é, ½Ã»ó¸é, °ü»ó¸é ¿µ»óÀ» ±¸ÇöÇÏ·Á ÇÏ¿´´Ù.
´ë»ó ¹× ¹æ¹ý : 120kVp, 2mAs µ¿ÀÏ Á¶°Ç¿¡¼­ °µÆ®¸® °¢µµ¸¦ 4¡Æ °£°ÝÀ¸·Î 90ÀåÄ¡ Çʸ§
À» ¾ò¾î ÀÔüÀûÀÎ Filtered back-projectionÀ» ½ÃµµÇÏ¿´´Ù ¿Ü°û¼±À» ã¾Æ Á¦°ÅÇÏ¿´°í, »ê¶õ¼±
¼ººÐÀ» Deconvolution ¹æ¹ýÀ¸·Î Á¦°ÅÇÏ¿© ÁÁÀº ¿µ»óÀ» ¾òµµ·Ï ÇÏ¿´´Ù.
°á °ú : ÀÌ ¹æ¹ýÀ¸·Î Ãà»ó¸é, ½Ã»ó¸é, °ü»ó¸é ¿µ»óÀ» ¾ò¾úÀ¸¸ç °¢ ¹æÇâ¿¡ ´ëÇØ µ¿ÀÏÇÑ ºÐ
ÇØ´ÉÀ» °®¾Ò´Ù. ±×·¯³ª ¿µ»óÀÇ ÁúÀº ´ë´ÜÈ÷ ³ª»¦´Ù.
°á ·Ð : Broad-beamÀ¸·Î µÈ CT ¿µ»óÀ» ±¸ÇöÇÒ ¼ö ÀÖ¾ú´Ù. À̸¦ À§ÇÏ¿© »ê¶õ¼± ¼ººÐÀÇ
DeconvolutionÀÌ ÇÊ¿äÇÏ¿´À¸¸ç, ÀÔüÀûÀÎ back-projectionÀ» ½Ç½ÃÇÏ¿´À¸¹Ç·Î Ãà»ó, ½Ã»ó, °ü
»ó ¸ðµç ¹æÇâ¿¡ ´ëÇØ µ¿ÀÏÇÑ ºÐÇØ´ÉÀ» °®°í À־ ORR µî Simulator-CT¿¡ ÀÀ¿ëÇÒ ¼ö ÀÖ
À½À» ¾Ë ¼ö ÀÖ¾ú´Ù. ±×·¯³ª ½Ç¿ëÀûÀÎ ÀÓ»óÀÀ¿ëÀ» À§Çؼ­´Â ¿µ»óÀÇ Áú °³¼±ÀÌ ÇÊ¿äÇÏ¿´´Ù.

Purpose : To generals the axial, coronal and sagittal images from conventional
simulation images, as a preliminary study of broad-beam simulator CT
Methods and Materials : Volumetric filtered back-projection was performed using 90
sheets of films from conventional simulator for every 4¡Æ gantry ang1e. Two mAs
exposure condition for 120kVp beam qualify at SFD 140cm was given to each film.
Outside the silhouette portion was removed and scatter component was deconvolved
before back-projection.
Results : The axial, the sagittal and the coronal images with same spatial resolutions
over all direction could be obtained. But image quality was very poor.
Conclusion : CT images could be obtained using broad-beam. Scatter deconvolution
technique was effective for this reconstruction. The fact that same spatial resolutions
over all direction tells us the possibility of application of this technique to DRR or
Simulator-CT. But the quality of image should be improved for clinical application
practicaly.

Å°¿öµå

Broad-beam CT; Cone beam CT; Simulator-CT; CT-Simulator; Simulation;

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