양전자방출 단층촬영술에 관한 고찰

홍시영 김천대학교 1987 김천대학교 논문집 Vol.8 No.-

Positron emission tomography is Very Complex diagnostic imaging procedure. PET Permits the investigator to Peer into the working hu-man brain and examine numerous biological Parameters without disturbing the normal equilibrium Physiology. Current PET Studies involve PET imaging of patient with epilepsy, Huntington's disease, stroke, brain tumor, Alzhei-mer's disease, and other movement disorders. However, our understanding of brain physiology will in-crease as the technology advances yielding higher resolution instrument, new radiopharmaceuticals, and improved analysis of PET data.​

Digital Subtraction Angiography에 관한 고찰

홍시영 김천대학교 1986 김천대학교 논문집 Vol.7 No.-

혈관조영술은 1953년 Seldinger법 출현 이후 선택적 혈관조영술이 가능해짐에 따라 진단방사선 분야에서 각종 순환기 질환의 진단에 많은 각광을 받아 왔다.

일부 대학생의 방사선 이용에 대한 지식조사

홍시영 ; 나수경 김천대학교 2016 김천대학교 논문집 Vol.27 No.-

This study was attempted to investigate the level of knowledges on the use of radiations of some university students, that is to provide some useful information for designing education programs to improve the knowledge of the use of radia-tions. The survey was performed for 517 university students from Oct. 10 to Oct. 15, 2005. The results of this survey can be summarized as follows; students who didn't get educations for the use of radiations were recorded as 415 students (80.7%) in which the reason that they didn't get such educations was there were no chances to receive the education' as 265 students (77.9%). Regarding the survey on 'Energy productions using an atomic power plant can reduce electricity rates', the right answer was presented as the highest level (60.9%), the lowest rate of right answers was recorded in the survey on 'The average amount of atomic air raids of workers on the radiation related job pre-sented smaller levels than that of the average person'as 20.4%. The basic knowledge on the use of radiations was presented as a low level of 5.96 £ 2,90 points based on the sum of 15 points. There were significant differ-ences in these results statistically according to the age, sex, grade, majoring, score and experience of the education of radiations.

磁氣共鳴影像 電算化 斷層攝影機의 利用分析

洪時榮 김천대학교 1988 김천대학교 논문집 Vol.9 No.-

The recent performance of the Magnetic Resonance Imaging Computed Tomography (MRI - CT) at two hospital was investigated during the first three months of 1987. The study was undertaken to analyze utilization status, cost and revenue data, and to examine profitability of the MRI -CT. Cost of the MRI -CT was calculated by applying actual costing system, and profitability was examined in terms of break – even analysis. Two hospitals had 200 beds and 220 beds respectively. The average operation rate which is the operating time during the normal operation period was 89.7%. The average number of scanning during period was 232. The case of radiologic examination per 100 patients was 14.5 and the number of MRI-CT scans per 100 radiologic examination was 4.6. 64% of MRI -CT scans were patient referred from other clinics and hospitals, Most of the scans, 86%, were performed for head examinations, and 92.3%, were patients of neuro-surgery department The study reveals that the revenue accrued by the operation of MRI-CT Scanner did not exceed the actual cost, 49,860 thousand won versus 98,730 thousand won. The break - even point was calculated as 101,905 thousand won. In purchasing the highly expensive equipments in hospitals, demand should be take into account and planning is recommended.

Parkinson's disease에서 [18F]-FP-CIT을 이용한 Brain PET/CT영상의 유용성

강용길 ; 홍시영 김천대학교 2009 김천대학교 논문집 Vol.30 No.-

Neuroreceptors and transporters have an important role in brain function.Parkinson's disease is a common neurodegenerative disorder that is mainly causedby dopaminergic neuron loss in the substantia nigra.Distribution, density, and activity of neuroreceptors and transporters can bevisualized by radiotracers with PET and SPECT.In vivo PET and SPECT imaging of presynaptic dopamine imaing are alreadyapplied to Parkinson's disease and other parkinsonism, and can demonstrate thedopaminergic dysfunction.Dopamine transporter imaging is useful in the diagnosis of Parkinson's diseaseand the most successful technique in the clinical use of neuroreceptor imaging.​Recently, several radiopharmaceuticals including 123I-FP-CIT, 99mTc-TRODATand 18F-FP-CIT for dopamine transporter imaging have been approved for theroutine clinical use in several European countries, Taiwan and Korea, respectively.Therefore, In this paper an overview of Parkinson's disease medicines for diag-nosis and radioactive 18F-FP-CIT using a PET/CT imaging has confirmed theusefulness of the clinical use.

방사선 강내치료를 위한 소조사면 전자선 cone의 선량분포 특성

나수경, 홍시영, 박병섭 김천대학교 2000 김천대학교 논문집 Vol.21 No.-

The intracavitary cones were designed which were made of stain-less steel and have scratched inside cone to be generated electron scatter and designed to be attached easily to the LINAC collimator and controlled cones length to be contacted smoothly between the patient and the cone tip. Two types of intracavitary cones were designed. One is the straight end cones with circular opening on the distal end and the other is 30 degree beveled end cones with elliptical opening on the distal end Each type of intracavitary cone ranged in daimeter from 2.5 cm to 3.5 cm and required a separate set of lower trimmer annulias cone diameter. The film phantom was designed with an internal cassette that accurately aligned the film edge with the film phantom surface. Film optical density data were measured by photodensitometer( Wellhofer 700i) Dosimetry measurements were made to commission the LINAC for 6 - 20 MeV electron using the intracavitary cones. Isodose curves were measured for all energy and cones combinations. Output is defined as the maximum dose per MU along the clinical central axis in water at 113 cm SSD. Calibration output, defined to be the output for the 15cm x 15cm diameter straight cone, was adjusted to 1.00 cGy/MU at each energy according to the TG-21 pro- tocol.

CaWO4증감지의 X선 조사에 따른 결함증가와 화질에 미치는 영향

김창규 ; 홍시영 김천대학교 2003 김천대학교 논문집 Vol.24 No.-

This paper analyzed the variation of characteristic image by defect of increase in intensifying screens. When the intensifying screens were exposed by X-ray, the defect crys- tals are increased. SEM shows the differences between them. It is shown that the defect characteristic curve of the intensifying screen between an artificial defect one and normal one was different. The Image Quality(I.Q) values and the resolving power values (LP/mm) with an artificial defect screen are decreased in comparison with the normal screen.

방사선과에 PACS의 응용

나수경 ; 박병섭 ; 홍시영 김천대학교 1993 김천대학교 논문집 Vol.14 No.-

This study is to make a foundamental abstract and the practical use of PACS in de-partment of radiology. A health demand has be extend that is scientization and popularization of medical skile. also medical eguipment, there fore, a inspection demand has being suddne increase of depantmental radiolgy. A dimension of this sort a PACS (picture Archiving and Communications systems) is Stroage and Care for immediate of patiental image also clinical information, and then the PACS can make offer medical service of good quality, because of that is total in-ormation of patient deliver to every clinical section without delay.

單一集塵法에 依한 라돈 崩壞生成物의 濃度測定

張時榮,魯聖基,洪鍾叔 대한방사선 방어학회 1981 방사선방어학회지 Vol.6 No.1

單一集塵法을 써서 空氣浮游塵中에 存在하는 라돈 崩壞生成物, 즉, RaA, RaB 및 RaC의 放射能(또는 濃度)을 測定하였다. 이것은 單一集塵裝置를 이용하여 平均孔隔(mean pore size)이 0.8㎛인 membrane 瀘紙에 採取한 試料의 全 알파放射能을 時差別로 測定한 수 그 結果로부터 라돈 崩壞生成物의 濃度를 Ci 또는 WL(working level)單位로 算出하는 方法이다. 여기서는 濃度外에도 濃度値의 標準偏差 및 라돈 崩壞生成物의 放射平衡狀態를 나타내는 放射平衡因子와 放射平衡比를 求하였다. Ci 및 WL單位로 주어진 라돈 崩壞生成物의 濃度는 實驗期間中 각각 0.30∼2.36pCi/l 및 ??로서 時間的 요동이 심하였는데 대개 하루中 午前에 높고 午後에 낮은 현상을 보여 주었다. RaA, RaB 및 RaC의 濃度算出에 따른 標準偏差는 각각 ±57.75%, ±22.32% 및 ±31.29%였으며 放射平衡因子는 平均 0.322였다. 그리고 RaA를 母核種으로 假定했을 때 各核種間의 放射平衡比는 대개 C₁< C₂< C₃인 것으로 나타났다. 여기서 C₁, C₂및 C₃는 각각 RaA, RaB 및 RaC의 濃度를 나타낸다. A measurement has been made for the radiactivities(or concentrations) of radon daughters, i.e., RaA, and RaC in airborne dust by means of single filtering method. This is to evaluate the radioactivities in terms of Ci or WL (Working level) from gross alpha counts measured in the selected-time intervals after an air sample is taken from a membrane filter paper with a mean pore size of 0.8㎛. This work involves determinations of standard deviation in radioactivities, radioactive equilibrium factor and ratio. It appears that a concentration of total radon daughters is 0.30∼2.36pCi/L or ??, depending on the sampling time. Generally the highest concentration was observed around nine o'clock in a day while the lowest value was obtained around seventeen o'clock. Standard deviations based on counting statistics of RaA's, RaB's and RaC's concentration are ±57.75%, ±22.32% and ±31.29%, respectively. It is revealed that the radioactive equilibrium factor is 0.322 while the radioactive equibrium ratio is of pattern C₁< C₂< C₃in general, Here C₁, C₂and C₃stand for concentrations of RaA, RaB and RaC, respectively.

고혈압전단계자에 대한 유산소운동이 심혈관반응에 미치는 영향

홍선주(Sun Joo Hong),김종경(Jong Kyung Kim),최현민(Hyun Min Choi),박시영(Si Young Park),이준희(Joon Hee Lee),전종목(Jong Mok Chun),노호성(Ho Sung Nho) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.42

It is generally known that in hypertensive individuals, exercise induces exaggerated increase in arterial blood pressure and in turn this dangerous elevation may increase the risks for myocardial infarction, cardiac arrest, or stroke. However, it has still not been investigated whether the exaggerated cardiovascular responses occur in prehypertension and these excessive responses are mediated by exercise pressor reflex overactivity. Therefore, the purpose of this study was to examine the effects of exercise pressor reflex on the cardiovascular responses when exercise intensity increased from rest through low exercise intensity to high exercise intensity. Twenty young, fit people (10 normotension and 10 prehypertension) with normal body fat percentage were recruited for this study. All subjects were instrumented to measure the cardiovascular responses at rest and during exercise. A catheter to collect blood samples was inserted into left brachial vein. Systolic blood pressure, diastolic blood pressure, and mean arterial blood pressure were significantly higher in prehypertension across workloads compared to the normotension. Stroke volume (SV), heart rate (HR), and cardiac output (CO) were significantly increased in both groups with increasing workloads, but SV and CO were significantly higher in prehypertension. There was no difference in total vascular conductance in both groups. Thus, exaggerated blood pressure responses were mediated via increases in CO. This study suggests that the excessive cardiovascular responses to exercise in prehypertension may be due to dysfunction of exercise pressor reflex.