X선 단순촬영에 있어서 신장결석의 출현에 관한 검토

유장수,송재관,허준 대한방사선과학회(구 대한방사선기술학회) 1989 방사선기술과학 Vol.12 No.1

DLTS 장치의 제작과 응용

兪長壽,金慶根,金仁洙 대구산업정보대학 1995 논문집 Vol.9 No.2

Deep level in horizontal Bridgman(HB) undoped GaAs were investigated by DLTS system personally manufactured. In as grown sample, T1(E_(C)-0.32eV), T2(E_(C)0.54eV) and T3(E_(C)0.82eV) were observed. These levels correspond to EL6, EL3 and EL2 respectively. As sample was annealed at 650℃, T3 level was separated into T3*(E_(C)0.74eV) and T3 level. When sample was annealed at 800℃, only T3* level was observed. For sample annealed at 900℃, T3* and T3 level were observed. From these results, we conclude that the EL2's behavior of annealing temperature can be explained by the model of As_(Ga)-V_(Ga)-A_(Sl)-V_(As).

腦定位的 手術에 있어 電算化 斷層珍斷機器의 利洞에 關한 硏究

兪長壽,曺光浩 대구산업정보대학 1992 논문집 Vol.6 No.-

Nerve surgical operation technique of modern medicine has been developed highly as nearly perfect than did. In spite of, approach about various lesions of lesion area located in brain center was difficult by usually method. But brain stereotactic operation technique using much gradually without big difference, it uses for all of diagnosis and treatment in tumor, brain hemorrhage, and center nerve bundle need resection with various method, and use of this instrument will increase more hereafter, and instrument much more easy for use will develop continuously. Likewise C.T. too, a computer of better, bigger capacity will develop than has been present, and I thought that it has charge of a part of healing of human disease and life prolong among the remarkable inspiring deed of medical engineering by growth of electricity, electron.

대뇌겸 및 천막부위 급성 경막하 출혈에 대한 임상적 분석

유장수,허철,홍순기,김헌주,한용표 대한신경외과학회 1991 Journal of Korean neurosurgical society Vol.20 No.1-3

A prospective analysis of 50 patients with acute interhemisphric subdural hemorrhage and tentorial hemorrhage, an unusual pattern of acute subdural hematoma. who were managed in a uniform way was analyzed to related outcome to hemorrhagic site. initial Glasgow Coma Scale(GCS) and combined injuries. The incidence of acute interhemisphric subdural hemorrhage(ISH) and tentorial hemorrhage(TH) after head trauma was 3.83%. 50 cases among 1303 head injured cases. And 80% of the above hemorrhage disappeared within two weeks after trauma. There was no significant relationship between feature of hemorrhage and intial GCS (P>0. 05), but there was highly significant relationship between initial GCS and Glasgow Outcome Scale(GOS) (P<0.001). There noted significant relationship between initial combined injury and GOS(P<0.0l), and also brainstem injury and GOS(P<0.00l).

電算化 斷層撮影 影像의 精度管理에 관한 硏究

兪長壽,金慶根 대구산업정보대학 1997 논문집 Vol.11 No.2

The quality of an image is the clarity with which on important anatomical structure can be visualized. Image quality in CT depends on a number of factors that arises from measurement errors, representational errors, positioning errors and image discontinuity errors. Several approachs used to describe image quality were discussed briefly as a means of review, these approaches include the line spread function, the point spread function the contrast transfer function, and the modulation transfer function. Spatial resolution is used to describe the degree of unsharpness present in an image. It is often represented by the MTF. Contrast resolution is the ability of the scanner to detect small changes in tissue density. Several factors that affect contrast resolution in CT include slice thickness, pixel size, detector aperture, and radiation dose. Several phantoms have been designed to measure performance of the CT scanners. These include the contrast scale phantom, the edge phantom for spatial resolution. The effect of motion on CT images has been found to be degrading. Such effects can be minimized by the use of shorter scan times. Noise in CT can be described by the noise power spectrum. CT artifacts can be equipment related or patient related. Patient motion can produce streak artifacts, while the equipment can produce ring artifacts. Contrast enhancement in CT refers to the use of contrast media to improve visualization of structures within the patient.

P.N.S.에서 Original Method와 New Method와의 비교 연구

兪長壽 대구산업정보대학 1996 논문집 Vol.10 No.2

Out study of caldwell and water's views, most common radioligical technique to delineate PNS, has verified that the ideal photographic image to diagnose PNS is, with eye socket, and with Water's view, only the one whose petrous ridge coincides with the lower edge of maxillary sinus. With the method used hitherto, it was difficult to obtain such a ideal image diagnostically. It was made possible by changing the revolving angle formed by the central ray and the head.

X선 단순촬영에 있어서 신장결석의 출현에 관한 연구

유장수 대구산업정보대학 1989 논문집 Vol.3 No.-

This paper investigated on influence on the distinguishability of renal stone in the accordance with thickness of object, X-Ray tube voltage and base density. In the relationship between object and renal stone shadow, object and tube voltage, the obtained rresults can be summarized as the following. 1. When thickness of object was thin, the distinguishability increased in base density 2.0~2.5, but for adults was best shown in base density 1.5. 2. In the relationship between object and tube voltage, the distnguishability increased at lower tube voltages(50~60KVP), using grid. As mentioned above, it was thought that this method was very effective in describing the phenomena of renal stone in film density 1.5, tube voltages 60KVP.

一般X線撮影에 있어서 片面필름과 片面增感紙의應用

兪長壽 대구산업정보대학 1990 논문집 Vol.4 No.-

In clinical fields, single screen-film system will be generalized according to high speed and high image quality of intensifying screen film system in future. In single screen-film system, for image the best image, we must choice good film accordidng to speed and gredient. Double screen-film system will be replaced single screen film system in direct radiography. Author has thought that single screen film system will be developed new diagnosis area according to X-Ray film.

電算化 斷層 撮影에서 X-線源과 濾過 線速, 制限 및 檢出에 관한 考察

유장수,김경근 대구산업정보대학 1995 논문집 Vol.9 No.2

The X-ray source requirements in CT depend on the radiation attenuation and the intensity rate desired. Clinical CT scanners use conventional X-ray source, since they provide the greatest radiation intensity. Two types of sources are used. These are fixed anode oil cooled tubes and rotating anode air cooled tubes, which can be pulsed in operation. The purpose of a filter in CT is twofold. First, it uncreases beam quality by absorbing low energy waves, and, secondly, it can be shaped to provide uniform X-ray transmission. The techique of collimation is important in CT, since it relates to patient dose and image quality. Detectors used in CT are of two types. These are scintillation detectors and gas ionization detectors. A scintillation detector uses a scintillation crystal coupled to a photomultipiler tube. The system coverts radiation into electric current signals, which are fed into the computer for processing. The gas ionization detector uses a pressurized gas chamber, which converts the radiation to electric current signals that are fed into the computer for processing. The research findings of a split detector system and the use of HgI₂ as CT detectors are presented. The elctrical signals received from the detectors are converted into digital information for computer reconstruction. A comparison of the criteria for data acquisition and response time is given.

排便 造影術에서의 正常値 및 非正常値의 分析

兪長壽,金相煥 대구산업정보대학 1998 논문집 Vol.12 No.2

This study was done to analysis of normal finding factors and abnormal finding factors of defecography by using fluoroscopy. The defecographic results were screened for the anorectal angle and perineal descent at rest, squeezing and during straing. Changes of rectal configuration and rectal canal width during straining were reviewed. Rectocele, rectal intussusception, and incontinence were observated. Contrast media of this study to make be very similar stool and before examination operators should explain methods of defecography to patient. Normal anorectal angle was measured to be 90˚, 80˚, 130˚ at rest, during squeezing, and straining respectively. In the spastic pelvic floor syndrome, increase of anorectal angle less than 10 degrees from rest to straining was observed. Incontinent patients had a large anorectal angle (mean 128˚)at rest. 7.8cm of perineal descent was found in descending perineal syndrome in comparison to 4.0cm in normal. Normal anal canal width was measured 1.4cm during straining but anal canal width in incontinenct patient was measured 1.2cm at rest. The anorectal angle was valuable in evaluation of spastic pelvic floor syndrome and fecal incontinence. In the cases of the rectoceles, anteroceles, and rectal prolaps, defecography is helpful in preoperative evaluation of rectal wall change and postoperative follow up.