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RISS 인기검색어
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- 저자 : 엄민지(Min Ji Uhm) (검색결과 2 건)
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족부전후방향 체중부하 촬영 시 적정 입사각에 관한 연구
엄민지,최원근,손순룡,이관섭,Uhm, Min-Ji,Choi, Weon-Keun,Son, Soon-Yong,Lee, Kwan-Sup 대한디지털의료영상학회 2013 대한디지털의료영상학회논문지 Vol.15 No.2
Incident X-ray angles of weight bearing foot AP radiography which differ in each medical institution were compared. Optimal angles were derived from the study and suggested as basic data for clinical application. 19 patients with no abnormality on right foot took part in the study from June 2013 to July 2013. Weight bearing foot AP radiography in the correct position was examined with the incident X-ray angles of $10^{\circ}$, $15^{\circ}$, $20^{\circ}$, $25^{\circ}$, $30^{\circ}$, and $35^{\circ}$. All the images were evaluated subjectively by 5 radiological technologists of over 15 year work experience using Likert scale as 1 for 'very poor', 2 for 'poor', 3 for 'fair', 4 for 'good', 5 for 'very good', 6 for 'excellent', and analyzed with ANOVA and Scheffe. Image quality was the most optimal at $20^{\circ}$ as 4.53, and relatively good at $25^{\circ}$ as 4.38 and at $30^{\circ}$ as 4.18. $35^{\circ}$ and $10^{\circ}$ were relatively poor. The average points of 6 groups indicated statistically significant difference (p<.01). In the post-mortem, 3 subgroups showed no statistically significant difference, and the average point of the groups of $20^{\circ}$, $25^{\circ}$, $30^{\circ}$was evaluated relatively higher than the other 2 groups. An optimal incident X-ray angle within the range from $20^{\circ}$ to $30^{\circ}$ for weight bearing foot AP radiography could make it possible to obtain the image of high diagnostic value and would be useful for clinical application in the future.
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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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