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하지 64 MDCT 혈관조영술에서 outrun 예방을 위한 검사방법
안병환(Byoung Hwan Ahn),옥승호(Seung Ho Ock),김순자(Soon Za Kim),권대철(Dae Cheol Kweon),권오성(Eun Kyoung Lee),이은경(Oh Seong Kweon),임흥선(Heung Seon Im),김명구(Myeong Goo Kim) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1
Purpose In present, MDCT has come into wide use. But outrun often occurs due to fast scanning and rotation time in lower extremity CT angiography with-64 MDCT. We studied the prevention to outrun in lower extremity CT angiography. Materials and Methods Between October 2006 and January 2007, during a period of 4 months, total 210 patients underwent a lower extremity CT angiography with 64 channel MDCT. We scanned patients from the level of lumber-spine three to feet in a single helical scan with 64 MDCT. Examination was scanned by each of different scanning methods. We changed the scan parameter in 3 ways. First, we set the delay time to 6.4 sec and the rotation time to 1sec. We called it to PG 1 (aorta slow). Second, we set the delay time to 20 sec and the rotation time to 0.4 sec. We called it PG 2 (aorta fast). Third method was same as PG 1 except of setting triggering level to popliteal artery. It was called for PG 3 (popliteal fast). The data from scanning was transmitted to 3D software program. Three-dimensional images were obtained using MIP(maximum intensity projection). Four radiologist evaluated all the results in reference to outrun, vein contamination, motion artifact and enhancement of vessel. Results In PG 1, there was no outrun. But it had some vein contamination and motion artifact because of long scan time. In PG 2, there was some outrun. But it had hardly vein contamination and motion artifact due to fast scan time. In PG 3, there was no outrun, too On the a:her hand, it had some vein contamination. Conclusion The best way to prevent outrun is program one (PG 1) or program three (PG 3) in lower extremity CT angiography with 64 MDCT. But each method has inherently a merit and demerit. We should use the protocol which is fit to patient history.
박수홍(Soo-Hong Park),옥승호(Seung-Ho Ock),서인화(In-Hwa Seo),김소리(So-Ri Kim),정환희(Hwan-Hee Jeong) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
In this study, peak frequencies of korean traditional wind instruments according to instruments were measured for introducing quality certification system. Also major dimensions of instruments were measured too, for analysis on manufacturing precesion.
Dual Source CT에서 Coronary검사의 방사선량 비교분석
신용환(Yong Hwan Shin),안병환(Byoung Hwan Ahn),옥승호(Seung Ho Ock),권오성(Oh Sung Kwon),임흥선(Heung Seon IM),김명구(Myeong Goo Kim) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1
Purpose This Paper compared the Radiation Dose of Dual Source ECG-gating Spiral Scan and ECG-triggered Sequential Scan in coronary CT. and Analysed how much the Radiation dose reduced in sequential scan. Materials and Methods We studied Spiral and Sequential scan in Phantoms and used by Dual source MDCT called Definition. Scan was made as follows;(Spiral scan:Kvp/mAs/Rotation time/Pitch/Scan time/=100/320/0.33/0.28/8.82, Sequential scan: Kvp/mAs/Table feed/Cycle time/Scan time =100/180/20/1.37/8.22). We used ECG Simulator as equipment( NETECH) Contrast media diluted (CM :1, Normal saline:24) An Experimental method compared CIDivol and CIDIDlP with Spiral and Sequential scan and were measured. Qualitive analysis evaluate the CTDIvol, and CTDIDLP, and SNR through ROI analysis. Quantitative analysis evaluate the Uniformity and noise, Preference Results The results obtained as follows; Radiation dose reduced about 28.8% in Sequential scan than Spiral scan. SNR increased in Spiral scan than Sequential scan. The image Qualities with Sequential scan showed better than Spiral scan. Conclusion In conclusion, by comparing the Phantoms image with Spiral scan and Sequential Radiation dose reduced in Sequential scan. If used and selected properly Sequential scan useful clinically applied to the patients with coronary Disease. (Heart Rate <60-65bpm)
부위별 CT검사에서 조영제 희석 사용에 대한 유용성 평가
이성주(Seong Ju Lee),박연(Yeon Park),정다희(Da Hi Jeong),옥승호(Seung Ho Ock),황희진(Hi Jin Hwang),임흥선(Heung Seon Hwang) 대한CT영상기술학회 2011 대한CT영상기술학회지 Vol.13 No.2
목적 대부분의 컴퓨터단층촬영 조영검사는 원액의 조영제를 주입하여 이루어지게 되는데, 이때 조영제급속주입에 따른 선속경화현상이 발생하기도 한다. 이에 선속경화현상을 줄이고 조영제양을 감소시키고자 조영제와 생리식염수를 혼합사용하여 희석비율에 따른 효과를 평가하고자 하였다. 대상 및 방법 2008년 12월 27일부터 2011년 1월 21일까지 동일 부위를 2회 이상 검사하는 환자 58명 중, 두번의 검사시 체중의 차이가 5%를 넘지 않는 49명의 환자를 대상으로 하였다. 64-MDCT(Brilliance Philips Medical System Cleveland Ohio, USA)를 사용하여 각부위를 검사하였고, 조영제는 원액과 9:1와 8:2(조영제대생리식염수)로 자동주입기(Dual shot auto injector, Nemotokyorindo, Japan)를 이용하여 각각 희석하여 주입하였다. 얻어진 모든 영상에서 여섯 부위인 경동맥, 쇄골하정맥, 상행대동맥, 폐동맥, 간실질, 비장실질에서 관심영역을 정하여 감쇄계수(HU)를 PACS 장비(M-view 5.4, Infinitt PACS, Korea)에서 측정하였다. 모든 데이터는 SPSS(vs.18) 프로그램을 이용하여 비교 검증하였다. 결과 조영제를 원액과 9:1과 8:2로 희석한 영상에서 여섯 부위의 감쇄계수평균값 중에 쇄골하정맥에서 평균값이 1035.5±823, 869.4土577.1, 470.0±577.0(p=0.029)로 유의하게 나타나 그 차이를 인정할 수 있었고, 나머지 다섯 부위에서의 감쇄계수값의 평균치는 차이가 없는 것으로 분석되었다. 결론 조영제를 희석하여 사용함으로써 쇄골하정맥부의 선속경화현상을 감소시킬 수 있어 화질개선에 영향을 줄 수 있었고, 나머지 측정부위에서 감쇄계수의 차이가 크지 않은 것으로 보아 환자에게 사용되는 조영제 양을 감소시켜 용량의존성(Dose dependent) 부작용을 경감시켜 줄 수 있을 것으로 기대된다. I. Purpose Undiluted solution of contrast media has been injected in the most CT examinations. Tue beam hardening effects were shown in some images due to using it with bolus injection. We used the dilution solution of contrast media to reduce the beam hardening effects and evaluated the ratio of dilution between contrast media and saline and its effects. II. Meterial and Methods 58 patients who were injected the undiluted solution of contrast media before were examined with dilution of contrast media in a 64-MDCT (Brilliance Philips Medical System Cleveland Ohio, USA) from December 2008 to January 2011. The dilution ratio of contrast media was 9:1 and 8:2 (Contrast media vs. Saline) and injection was done by an auto-injector (Dual shot auto injector, Nemotokyorindo, Japan). All images were acquired in six different regions like Carotid Artery, Subclavian Vein, Ascending Aorta, Pulmonary Artery, Liver Parenchyma, and Spleen Parenchyma. HU values were measured on the PACS (M-view 5.4, Infinitt PACS, Korea) in six different regions. SPSS (v18) was used for verification of all data. III. Result The mean HU values in only Subclavian Veins were 1035.5±823, 869.4±577.1, 470.0±577.0 (p=0.029) in undiluted and 9:1 and 8:2 diluted solutions. It was a significantly difference. Others HU values showed no differences. IV. Conclusions The dilution of contrast media could reduce the beam hardening effects in Subclavian vein region and finally improve image quality. And also, we could expect that the side effects of dose dependent contrast media will be decreased because there was no difference of HU values in other regions.