http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
주영철,한충환,엄태준,이상욱,김국원,Joo, Young-Cheol,Han, Choong-Hwan,Um, Tai-Joon,Lee, Sang-Wook,Kim, Kug-Weon 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.4
Temperature distribution of the circular heat source was studied by analyzing the heat transfer of the environment of the circular source for OLED. Circular nozzle source was used to fabricate thin organic layer as the organic material in it was heated, vaporized and deposited to the large size panel. A modified heater structure of circular source has been suggested. The results of numerical analysis shows that the modified heater structure can use 15% more powder in a batch than the original heater structure does. Moreover, the modified heater structure can improve the uniformity of organic vapor deposition by controlling the temperature.
척추 전장 측면 방사선검사 시 손바닥 정면 자세가 척추골반지표에 미치는 영향
주영철,김한용,김동환,Joo, Young-Cheol,Kim, Han-Yong,Kim, Dong-Hwan 대한방사선과학회 2022 방사선기술과학 Vol.45 No.5
The purpose of this study was to investigate the effect of cross arms and palms facing forward on spinopelvic parameters during the whole spine lateral radiography. In addition, we would like to present the usefulness of a posture with the palm facing forward during whole spine lateral radiography of the spine using EOS. The subjects of this study were images of a total of 50 patients (18 males, 32 females) who whole spine lateral radiography using the conventional method and the EOS method from October 2020 to March 2021. The posture used in this study was set as 'CAP' for cross arms and 'PUSH' for posture with palms facing forward. In this study, among the spinal stability factors, thoracic kyphosis (thoracic vertebrae 4 to 12), lumbar lordosis (lumbar vertebrae 1 to sacrum 1), sagittal vertical axis, sacral slope, and shoulder flexion angle were compared on average. The mean thoracic kyphosis was 34.52±12.46° for CAP and 28.46±10.81° for PUSH (p<0.01). The lumbar lordosis of CAP was 42.45±17.45°and that of PUSH was 40.56±16.14°(p>0.57). The sagittal vertical axis was 26.59±34.34 mm in CAP and 21.21±35.41 mm in PUSH (p>0.44). In CAP, the sacral slope was 30.96±10.29°, and in PUSH, it was 31.01±10.19° (p>0.98). shoulder flexion angle was 38.31±8.24° for CAP and 26,08±6.71° for PUSH(p<0.01). As a result of this study, the PUSH posture is considered to be a posture that can minimize the shoulder flexion angle and can perform a stable examination while minimizing changes in spino-pelvic parameter.
한국인 성인 남성의 흉부 방사선영상에서 자세와 연령에 따른 심장 크기 및 심흉비의 정상 범위와 변환율
주영철(Young Cheol Joo),임청환(Cheong Hwan Lim),김연민(Yun Min Kim),정홍량(Hong Ryang Jung),홍동희(Dong Hee Hong) 대한방사선과학회(구 대한방사선기술학회) 2017 방사선기술과학 Vol.40 No.2
본 연구는 디지털 흉부 방사선 영상에서 한국인 성인 남성을 대상으로 자세(흉부 후-전과 전-후 촬영)와 연령에 따른 심장 크기 및 심흉비의 정상범위와 자세 및 연령 변화에 따른 상호 호환할 수 있는 변환율을 제시하고자 한다. 2014년 1월부터 12월까지 건강검진센터에서 같은 날에 흉부 후-전 촬영(chest PA)과 흉부 저선량 전산화단층촬영을 실시한 수진자 중 정상으로 판독된 1,300명에서 연구 목적에 적합한 남성 1,024명을 대상으로 하였다. 심장크기(CS)와 심흉비(CTR) 측정은 Danzer의 방법을 이용하였다. 본 연구 결과, 한국 남성의 Chest PA 및 AP영상에서 CS와 CTR의 정상범위는 Chest PA의 경우 CS 135.48 ㎜, CTR 43.99%이었으며, Chest AP 영상에서 CS는 155.96 ㎜, CTR은 51.75%로 나타났다. CS와 CTR의 평균값 차이는 통계적으로 유의하였다(p<0.01). Chest PA와 AP영상에서 심장 좌·우측은 통계적으로 유의한 차이가 없었다(p>0.05). CS의 경우는 Chest PA(p>0.05)와 Chest AP(p<0.05)에서 통계적 유의성의 차이를 보였다. 흉곽크기와 CTR은 Chest PA와 AP 모두에서 연령변화에 따른 통계적으로 유의한 평균값의 차이를 보였다(p<0.01). 본 연구 결과 Chest PA보다 Chest AP영상에서 CS는 약 15%, CTR은 17% 확대되었고, 모든 연령에서 자세변화에 따른 CS와 CTR은 약 10%의 차이를 보였다. Purpose of this study is present the normal range of cardiac size and cardiothoracic ratio according to patient position(chest PA and AP) and age of Korean adult male on digital chest X - ray, And to propose a mutually compatible conversion rate. 1,024 males were eligible for this study, among 1,300 normal chest patients who underwent chest PA and low-dose CT examinations on the same day at the S Hospital Health Examination Center in Seoul From January to December 2014. CS and CTR were measured by Danzer (1919). The mean difference between CS and CTR was statistically significant (p<0.01) in Chest PA (CS 135.48㎜, CTR 43.99%) and Chest AP image (CS 155.96 ㎜, CTR 51.75%). There was no statistically significant difference between left and right heart in chest PA and AP images (p>0.05). CS showed statistically significant difference between Chest PA (p>0. 05) a nd C hest AP (p<0.05). The thorax size and CTR were statistically significant (p<0.01) in both age and chest PA and AP. Result of this study, On Chest AP image CS was magnified 15%, CTR was magnified 17% compare with Chest PA image. CS and CTR were about 10% difference by changing posture at all ages.
주영철(Joo Young-Cheol),김승혁(Kim Sheung-Hyuk) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.3
The purpose of this study is to investigate the effect of posture changes(Anteroposterior projection, Posteroanterior projection) in the plain abdominal examination on breast dose and to examine its clinical usefulness. This study was used a human body phantom and a glass dosimeter. Glass dosimeters were directly inserted from the center and outside of medial and lateral. In this study, the deep dose was measured in the right breast and the surface dose in the left breast. During the abdominal examination, the central X-ray incident point was perpendicularly incident to the image receptor 5 cm above the iliac crest. The exposure parameters were 82 ㎸p, 320 ㎃, 50 ㎳, x-ray field size 14×17 inch The distance between the center X-ray and the detector was fixed at 110 cm, and only the top two AEC chambers were used. As a result of this study, the medial and lateral side doses of the right breast were 535.73±30.68 μ㏉ and 414.46±33.52 μ㏉ for erect AP, and 145.80±18.52 μ㏉ and 148.76±12.92 μ㏉ in erect PA. The superficial breast dose was 754.00±68.36 μ㏉ on the medial side and 674.06±45.58 μ㏉ on the lateral side in the erect AP, 70.66±7.98 μ㏉ on the medial side, and 86.46±15.35 μ㏉ on the lateral side in the erect PA. There was a statistically significant difference in the difference between the mean values of the medial and lateral side doses in the deep and superficial areas of the breast according to the postural change (p <0.01). As a result of this study, If the abdominal radiography was examined in the PA position, the dose reduction effect was 72.78% on the medial side, 64.10% on the lateral side of the deep breast, 90.62% on the medial side, and 87.17% on the lateral side of the superficial breast compared to the AP position.
디지털방사선 환경에서 흉부 후-전 방향 검사 시 초점과 영상수용체간 거리의 적절성
주영철(Young Cheol Joo),임청환(Cheong Hwan Lim),유인규(In Gyu You),정홍량(Hong Ryang Jung),이상호(Sang Ho Lee) 대한방사선과학회(구 대한방사선기술학회) 2016 방사선기술과학 Vol.39 No.2
본 연구는 DR system에서 Chest PA 검사 시 일반적으로 적용되는 SID(180 ㎝)가 실제 심장크기 및 심흉비를 묘사하는데 적합한 거리인지 고찰해보고, 장비가 지닌 기하학적 원인이 영상에 미치는 영향을 알아보고자 한다. 자체 제작한 Chest phantom과 XGEO-GC80, INNOVISION-SH, UD150B-40 장비에 CXDI-40EG detector를 조합한 X선 발생장치를 이용하였다. 실험방법은 SID를 180 ㎝로 고정 후 OID를 0, 75, 83 ㎜로 변화시키며 영상을 획득하였다. 영상은 Centricity Radiography RA1000 PACS system에서 측정하였다. 통계프로그램은 SPSS(Version 22.0, SPSS, Chicago, IL, USA)를 사용하였고, p-value는 0.05 이하를 통계적으로 유의한 것으로 평가하였다. OID 0 ㎜에서 세 장비 모두 팬텀의 실제 CS, BS 보다 약 2.7∼3.5 ㎜정도 확대되었고, 계산된 확대율과 비교해 보았을 때 1.6∼2.8% 확대되었다. OID 75 ㎜와 OID 83 ㎜에서는 6∼8 ㎜범위에서 CS와 BS가 확대되었다. 계산된 값과 비교 했을 때 측정된 값은 6.1∼7.9% 확대되었다. OID 변화에 따른 CS와 BS는 각 그룹간에 통계적으로 유의한 차이(p<0.05)를 보였으며, 사후분석에서는 OID 0㎜ 그룹만 독립적인 그룹으로 나타났고, 75 ㎜와 83 ㎜는 동일한 그룹으로 분리되었다. 하지만 OID 변화에 따라서 통계적으로 유의한 차이가 없었으며(p>0.05), 사후 분석에서도 모두 같은 그룹으로 나타났다. DR system에서 Chest PA 검사 시 일반적으로 이용되고 있는 SID에서 검사하는 경우 심장의 크기는 실제 크기보다 6∼8 ㎜크게 나타나며 이는 실제 이론적인 값보다 6.1∼7.9% 확대되어 나타났다. The purpose of this study is to evaluate propriety of using SID 180cm at Chest PA examination and to find effect of geometrical cause to the image. XGEO-GC80, INNOVISION-SH, CXDI-40EG detector and a chest phantom designed self-production was used for this study. Images were acquired at SID 180cm with changing the factor OID as 0, 75 and 83mm and were analyzed by Centricity Radiography RA1000 PACS system. Statistical program was used the SPSS (Version 22.0, SPSS, Chicago, IL, USA), p-value(under 0.05) was considered to be statistically significant. In OID 0 ㎜ was enlarged about 2.7~3.5 ㎜ than the actual degree of the HS, BS of phantom in all equipments. Compared with the calculated magnification has been expanded 1.6~2.8% when viewed. The OID 75 ㎜ with OID 83 ㎜ was extended from the CS and BS 6~8 ㎜ range. Compared to the calculated values, the measured values are expanded from 6.1 to 7.9%. CS and BS according to the OID change showed a statistically significant difference (p<0.05) among each group, the post-analysis only OID 0 mm group appeared as an independent group, 75 mm and 83 mm are separated in the same group It was. But had no statistically significant difference could change depending on the OID (p>0.05), post-mortem analysis showed, both in the same group. Heart sizes appears larger than actual size 6~8 ㎜ at chest PA examination which is enlarged 6.1~7.9% more than the actual theoretical value. We can find magnification of the image because of the increase of the OID due to technical limitations between cover of standing detector and the image plate. so we suggest to have occurred between them when considering the need to adjust the equipment installed by the SID to match the characteristics of the equipment.
자동노출조절장치를 이용한 흉부 방사선검사 시 갑상샘 장기선량 최소화를 위한 새로운 차폐 방법에 관한 연구
주영철(Young-Cheol Joo),홍동희(hong dong hee),한범희(Han Beom Hui) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.5
The purpose of this study is to investigate the effect of radiation shielding on the thyroid organ dose and image quality during Chest PA examination using automatic exposure control system. This study was conducted in the patient posture and examination conditions such as Chest PA using human model phantom. An experiment without shielding was set as a control group (non) and the cases of using paper coated with a contrast agent (contrast) and bismuth (bismuth) were used as experimental groups. Compared to non-shielded(non), the dose at bismuth increased about 7% in C(cervical vertebrae)5 and C6 and 14% in C7 and contrast showed dose increases of about 17 to 19% in C5 and C6 and about 21% in C7. As a result of the image quality comparison, when measured in the center of the cervical vertebrae, both SNR and CNR in bismuth increased about 40% higher than non, and contrast showed about 8 to 9% improvement. Compared with soft tissues of the cervix, bismuth reduced SNR by about 15% and CNR by about 13%, in contrast, SNR decreased by 11%, and CNR decreased by about 10%. In the Chest PA using AEC, the method of using the shield in front of the collimator has the advantage to observe the anatomical structure of the neck area well compared to the method using the lead. However, the dose at the neck can be increased by 7-21% depending on shielding materials.