IRUCAA@TDC : 歯科用コーンビームCT装置ＣＢ Throneの適正撮影条件
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(6) &B" ð$CB Throne V#ä¶xÛ. .-5. à4. A1UO9PV9~. à5. ·{UO9PV9~. U3YP" Á"U[aR¨;_bL!U".--. Throne U<Aa#ä¶xÛUO9P*EL. kV V.-mA R.2mA"./-kV V.-mA R.2mA Q. "±«¶xÛQ±«V Á>+_ba./-kV/. W9Hb]"L[VOA_bT9 ë>+_ba]. .2mA e.--kV/.-mA [Qþ|DIP]L[VO. VR¨;_bL!BVBR=_"}U Throne QW. =T9 ë>+_ba]VR¨;_bL!. ZÒÙ"+_ba±« ÁV ë>8SRDbP. # ". ]" .--kV/.-mA [Q¶xÛeþ Q?a"GT dMÅV42èWeþ Q?a1ã>¿°Db L! ÅV42eD_Uþ GaL\UW"^`þ9. DVáªU8LNPâ%VCXeü?[ELÔ]ò ¾>¾CÄèÀVzJM¦ÈT_XU©H]0 ÏÈ"Ô]ò¾;w¾CÄèVËvP¼ûU ÆøE[G!. ¶xÛQV Á>ZÒ"USV!'IóRTaV ="[L"JbKbV¶xÛQSV!'V42è WUTa=UO9P*Ga8S>8a!®¢"@ U" Á9~e;PD_U ÁUO9PV*e ª9"[L³V42èWUO9P]*eªN P"Bb_V%e^`ÿW"UG_=UGaQÿQ 8a! T<" Modulation Transfer Function +MTF, U^N PA1e@U"U9~ELÚ¬"W¶x ÛUò?@xDbT9BR>G_=UDbP9 a.-,"..,!BVBR=_"®V½9~U<9P A1>¶xÛUò?@sîELVW"·{V xR¨;_ba!·{>ñ@TaZS6²§ìV µ>¯-UT`"½"UWA1>þ|E L^:UF_bLVQ8c:!GTdM"9~D bLVWA1QWT@"éy'R9;a!B VBR=_"A1e½"U9~GaVW¯ -=]EbT9R¨;_bL!. ! $ /Vqmfjæ¾Rj&rn&p CT ê÷ CB ' .1 '. *. ). .,tuõ"Ýtí"D£."Ã&¦»$Ñ×ÄJ j&rn&p CT ¶xU<Aa¤èW#¾CÄè" $!$/2.(/26"/---# /,&ú=Ó"ùt $"Ö5TG"zï]Î"Þ&ÌÜ$ $E?¾ ¾R CT ê÷+0DX multi-image micro CT!, ßô1RÅ42èWV*#¾CÄè"$"$64(.-6" /--/# 0,¸( Ø"ÑY "¹D Ô"HïO7"&ú Ç$ ¾R7è CT PSR6---V42èWVºÿ#ý¾ " "($4(./"/--0# 1,Schulze, D., Heiland, M., Thurmann, H., Adam, G. : Radiation exposure during midfacial imaging using 4- and 16-slice computed tomography, cone beam computed tomography systems and conventional radiography. Dentomaxillofac Radiol, ##$50(53"/--1# 2,Tsiklakis, K., Donta, C., Gavalla, S., Karayianni, K., Kamenopoulou, V., Hourdakis, C. J. : Dose reduction in maxillofacial imaging using low dose Cone Beam CT. Eur J Radiol, %&$1.0(1.4"/--2# 3,Arai, Y. Tammisalo, E., Iwai, K., Hashimoto, K., Shinoda, K. : Development of a compact computed tomographic apparatus for dental use. Dentomaxillofac Radiol, "'$/12(/15".666# 4,Ýtí"D£."tuõ"Ã&¦»$Ñ×ÄJ7 è CT VÂR)0DX Multi Image Micro CT* VDã 1#¾CÄè"$!$.12(.21"/---# 5,¸KÕ¡",)É¥"ÐFG<"ò´çÊ"Nö^u \$:ÍU<Aa¾Rhlikè CT Vå''og.
(7) _KM. Vol"+*2!No",(,**2). <D CT 79:Sf&"xUX;E@BE?^!"&#.2/ '.3,!,**-" 3)Araki, K., Maki, K., Seki, K., Sakamaki, K., Harata, Y., Sakaino, R., Okano, T., Seo, K. : Characteristics of a newly developed dentomaxillofacial X-ray cone beam CT scanner (CB MercuRayTM): system configuration and physical properties. Dentomaxillofac Radiol, ###/+'/3!. +*3. ,**." +*)Htu!oR|V!Z%ic!Gz !h T#4k CT 8Lm{J(F) &MTF 8nr&"soI p}O!$#,3'-0!+33/" ++)\a]!gW Y!d P!qje[!bw! vtyc#AC>=B;= CT 756:L`8Nl~{ J"xQM^!%&#+..1'+./-!,***". Suitable Exposure Conditions for CB Throne$# New Model Cone Beam Computed Tomography Unit for Dental Use Kouji TANABE+)!Keiichi NISHIKAWA+)!Aya YAJIMA+) Shigeru MIZUTA+)!Tsukasa SANO+)!Yuuji KOUSUGE,) Yasutomo YAJIMA-)!Kanichi NAKAGAWA.) +). Department of Oral and Maxillofacial Radiology, Tokyo Dental College. ,). Department of Radiology, Chiba Hospital, Tokyo Dental College. -). Department of Oral Implantology, Tokyo Dental College. .). Department of Endodontics, Pulp and Periapical Biology, Tokyo Dental College. Key words : cone beam CT, exposure condition, spatial resolution, noise. The CB Throne! is a cone beam computed tomography unit for dental use!and the smaller version of the CB MercuRay developed by Hitachi Medico Co" We investigated which exposure conditions were suitable in the clinical use" Suitable exposure conditions were determined by simple subjective comparisons" The right temporomandibular joint of the head phantom was scanned at all possible combinations of tube voltage (60! 80!100!120kV) and tube current(10!15mA) " Oblique-sagittal images of the same position were obtained using multiplanar reconstruction (MPR) function" Images obtained at 120kV and 15mA!which are the highest exposure conditions and certain to produce images of the best quality!were used to establish the standard" Eight oral radiologists observed each image and standard image on a LCD monitor" They compared subjectively spatial resolution and noise between each image and standard image using a 10cm scale" Evaluation points were obtained from the check positions on the scales" The Steel method was used to determine significant differences" The images at 60kV/10mA and 80kV/15mA showed significantly lower evaluation points on spatial resolution" The images at 60kV/10mA!60kV/15mA and 80kV/10mA showed significantly lower evaluation points on noise" In conclusion!even if exposure conditions are reduced to 100kV/10mA!100kV/15mA or 120kV/10 mA!the CB Throne will produce images of the best quality" (The Shikwa Gakuho!"!'#+*.'+*3!2008). & +/ &.
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