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- 저자 : 정성민(Seong Min Cheong) (검색결과 3 건)
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Head Angiography 검사 시 spiral mode와 Flash spiral mode의 Pitch별 선량과 화질평가
엄민지(Min Ji Uhm),정성민(Seong Min Cheong),유흥준(Heung Joon Yoo) 대한전산화단층기술학회 2012 대한CT영상기술학회지 Vol.14 No.1
목적 Head angiography 검사 시 본원의 spiral mode 프로토콜과 Flash spiral mode에서 각각의 Pitch(l.55, 2, 2.5, 3)를 적용하여 적절한 Pitch와 Scan delay를 설정하여 이미지와 방사선피폭선량을 비교평가하고자 하였다. 대상 및 방법 사용된 장비는 128 MDCT(Somatom definition flash, Siemens, Germany)를 사용하였다. Image qulity와 선량측정을 위해 syngo acuisition(Simens)과 AAPA Phantom(Model 76-40), RANDO phantom(Model ART-200-5)과 광학 유리 선량계(GD352M, 12 mm)를 사용하였다. Rando pantom을 사용하여 동일한 장비와 검사 range, FOV로 본원에서 사용하고 있는 spiral mode 검사 프로토콜과 Flash mode에서 각각의 Pitch(1.55, 2, 2.5, 3)별로 시행하였다. AAPA Phantom에서 슬라이스 두께, 해상도, metal artifact를 평가하였으며 RANDO phantom에서 SD값을 측정하였다. 유리 선량계를 사용하여 Orbit 표면, frontal lobe, occipital lobe의 organ dose룰 측정하였다. 또한 Dyevaluation을 이용하여 Contrast enhancement의 Peak time과 100HU time을 구하여 적절한 scan delay를 설정하였다. 위 결과값을 적용하여 적절한 Pitch와 scan delay를 설정하여 Flash mode로 직접 검사하여 기존의 spiral mode와 실제 영상을 평가하였다. 결과 슬라이스 두께, 해상도에서는 두 mode간 차이를 보이지 않았으며 metal artifact는 spiral mode와 비교해 pitch가 증가함에 따라 증가하였고 균일도는 Flash mode에서 42% 증가하였다. 유리선량계의 Organ dose는 Orbit 표면, frontal lobe, occipital lobe에서 Flash mode에서 70% 감소하였다. DyEva를 이용한 contrast enhancement의 Peak time과 100HU time의 평균차이는 4초였다. 위 결과값을 적용한 Flash mode의 pitch 1.55, scan delay 4초로 설정한 실제 이미지상 기존 spiral mode와 비교해 circle of willis을 포함한 artery 평가에 큰 차이를 보이지 않았다. 결론 기존의 spiral mode와 비교하여 Flash mode에서 낮은 선량과 빠른 스캔 시간으로 circle of willis를 포함한 동맥혈관의 질환판별과 추후검사에 영상의 질을 유지하며 영상판독에 어려움이 없었다. I. Purpose we tried to compare with dose and image quality between Flash spiral mode according to each pitch(1.55, 2, 2.5, 3) and Spiral mode to make an optimal pitch and scan delay in Head angiography. II. Material & Method 128 channeal MDCT (Somatom definition flash, Siemens, Germany) was utilized. syngo acuisition(Simens) and AAPA Phantom(Model 76-40) and RANDO phantom(Model ART-200-5) and TLD(thermoluminescence dosimeter) RANDO phantom (Model ART-200-5) were used for image quality and Dose. AAPA phantom and RANDO phantom were measured slice thickness, resolution, metal artifact and SD value. TLD was used for measurment of organ dose in orbit surface, frontal lobe, occipital lobe. also Dy Evaluation was used for optimal scan delay by calculating peak time of contrast enhancement and 100HU time. we compared with real image between Flash spiral mode according to optimal pitch and scan delay and spiral mode. III. Result Slice thickness, resolution were not changed for each mode but metal artifact was increased for increasing pitch factor of flash mode. SD value was increased 42% in flash mode. Organ dose(orbit surface, frontal lobe, occipital lobe) has been decreased 70% in flash mode. mean difference with peak time of contrast enhancement and 100 HU was 4 s. Image between Flash spiral mode applying 1.55 pitch and scan delay with 4 s and Spiral mode were not changed for artery including circle of willis. IV. Conclusion Flash mode was maintained image quility of artery including circle of willis with low dose and fast scan time compared with spiral mode
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유흥준(Heung Joon Yoo),정성민(Seong Min Cheong),서동수(Dong Soo Suh) 대한전산화단층기술학회 2010 대한CT영상기술학회지 Vol.12 No.2
Purpose According to the development of devices from multi-detector computed tomography (MDCT) to dual source computed tomography(DSCT), protocol using DSCT with 140 kVp can be used in the examination of neck angiography. This can be considered to reduce beam hardening artifact at the portion of shoulder than when used single source CT with 120 kVp. for adapting to ALARA’s principle, we tried to make an optimal image quality with minimum dose and to compare with dose and image quality between DSCT and MDCT. Materials and methods Dose and image quality was compared and evaluated in each case of single source CT versus DSCT at examination of neck angiography. 16 channel MDCT(Somatom Sensation 16 Siemens, Germany) and DSCT(Somatom Definition Siemens, Germany) devices were utilized. Rando phantom(Model ART-200-5) and thermoluminescence dosimeter(TLD, GD352M, 12 mm) were used for measurement of dose according to protocol and organ’s dose figure. Lung-chest phantom(Model RS-330) was used for measuring the image quality. CTDⅣol was presented by monitor of CT device and TLD was located in sensitⅣe portion of radiation like thyroid, salⅣary gland, orbit. noise was assessed by making region of interest(ROI) in three sections of aortic arch level indicating severe artifacts. Also we compared an image using DSCT versus examination previously performed by 16 channel MDCT selecting a patient with similar body shape. Results CTDⅣol value bas decreased more as dual source compares in single source 16 MDCT. Organ dose(thyroid, salⅣary gland, and orbit) has been decreased in dual source in comparison with other source. In the image quality, noise has been decreased in DSCT in comparison with single source and 16 MDCT. In fact, that also reduced artifact. Conclusion Protocol using of dual source is useful than single source, when organ dose and noise result analysis has used Rando phantom.
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16 MDCT장비에서 Dose Modulation Program인 CareDose와 CareDose4D의 CTDIvol값 비교
이희정(Hee Jeong Lee),권성옥(Seong Ohk Kwon),김주(Joo Kim),서동수(Dong Soo Suh),정성민(Seong Min Chung),임청환(Cheong Hwan Lim) 대한전산화단층기술학회 2005 대한CT영상기술학회지 Vol.7 No.1
Purpose The aim of this study is to apply to clinic a proper technical factor by comparing the value of CTDIvol with dose modulation program of CareDose and CareDose4D in 16 MDCT. Material & Method The value of CTDIvol of constant and variable mA(140mA) was measured in Siemens somatom sensation 16 VB10B CT. The measurement of CTDIvol of CareDose and CareDose4D was performed with technical factor variation. With ART phantom of human shape, CareDose used the Siemens somatom sensation 16 VA70C, and CareDose4D done Siemens somatom sensation 16 VB10B. Result The value of CTDIvol of constant mA and variable mA of CareDose4D was 9.8mGy to 10.92mGy, and 4.13mGy to 5.58mGy, respectively. The value of CTDIvol by kVp variation was minimum 2.53mGy, 2.335mGy at 80kVp and maximum 11.34mGy to 10.18mGy at 140 kVp in the two mode. The value of CTDIvol by table pitch variation in CareDose didn’t vary with 8.14mGy, that by pitch variation of 1, 1.2, 1.5, 2 was 7.38, 7.36, 5.94, 4.60mGy, respectively. The value of CTDIvol by slice thickness variation in CareDose also didn’t vary with 8.14mGy, but CareDose4D increased from 7.26 to 7.35mGy according to increment of thickness. When the tube rotation time was 0.5, 0.75, 1, 1.5 second, the value of CTDivol was 8.14, 8.56, 8.14, 8.21mGy in CareDose and 7.27, 7.30, 7.29, 7.38mGy in CareDose4D, respectively. The value of CTDIvol by scan type was 17.16 and 17.97mGy in CareDose and CareDose4D with sequence mode, and 22.06 and 22.65mGy with spiral mode. Conlclusion The value of CTDivol was decreased by appling CT with dose modulation program for reduction of exposed dose. The value of CTDIvol excluding scan type of technical factor was decreased more in CareDose4D than in CareDose.
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