1.Radiologic consideration of intra-arterial digital subtraction angiography
Jae Yeong CHANG ; Jae Ryang JUHN ; Jong Deok KIM
Journal of the Korean Radiological Society 1985;21(5):742-750
Intra-Arterial Digital Subtraction Angiography(IADSA) was performed in 128 patients during 13-month period. Weexperienced the same advantages of IADSA over conventional film-screen angiography:(1) significant reduction incontrast material dose: 1/3 of the dose of conventional angiography, (2) reduced film cost: 18% of the cost ofconventional technique, (3) decreased need for selective catherization,(4) shortened examination time, and (5)more ready detection of cnntrast material.
Angiography
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Angiography, Digital Subtraction
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Humans
2.Cerebral Venous Thrombosis in the Inferior Sagittal Sinus.
Chang Seok SONG ; Hee Kwon PARK ; Joung Ho RHA ; Seong Hey CHOI ; Chang Ho YUN ; Jeong Jin PARK ; Na Young RYOO ; Im Tae HAN ; Chang Gi HONG ; Choong Kun HA
Journal of the Korean Neurological Association 2011;29(4):393-395
No abstract available.
Angiography, Digital Subtraction
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Venous Thrombosis
3.An invariant approach for image registration in digital subtraction angiography.
Chinese Journal of Medical Instrumentation 2006;30(1):15-14
In modern medicine, DSA is a powerful technique in visualizations of blood vessels of X-ray images. In DSA, the most important way for motion correction is image registration. In this paper, a new approach to the registration is used. It is based on means of template matching according to a combined invariants-based similarity measure and TPS image warping. Furthermore it has been improved through practice. and tests have proved to remove the motion artifacts effectively and rapidly.
Algorithms
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Angiography, Digital Subtraction
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methods
4.The Diagnostic Value of Digital Subtraction Angiography Considering the Pathomechanism of Symptomatic Cerebral Developmental Venous Anomaly.
Bo Seong KWON ; Bum Joon KIM ; Joon Mo KOO ; Hyukjun YOON ; Joo Yea JIN ; Sun U. KWON
Journal of the Korean Neurological Association 2014;32(2):103-107
Cerebral developmental venous anomaly (DVA) is generally benign. However, we have experienced two cases of DVA causing symptoms. In the first case, the patient demonstrated DVA with venous infarction. DVA was visualized in the arterial phase using digital subtraction angiography (DSA), and was diagnosed as arterialized DVA. The second case presented as transient right homonymous hemianopia. DSA revealed venous congestion; the transient aggravation of venous congestion may have caused the symptom. DSA is useful for diagnosing the pathomechanism of symptomatic DVAs.
Angiography, Digital Subtraction*
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Hemianopsia
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Humans
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Hyperemia
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Infarction
5.Assessment of Spacial Distortion in Digital Subtraction Angiogra phy for Stereotactic Radiosurge ry: An Experimental Study with Phantom.
Sun Won PARK ; Moon Hee HAN ; Dong Gyu KIM ; Hyun Tai CHUNG ; In Chan SONG ; Hong Dae KIM ; Kee Hyun CHANG
Journal of the Korean Radiological Society 1999;41(6):1051-1055
PURPOSE: In stereotactic radiosurgery, awareness of the precise localization and volumetry of tumors and of critical organs, and the planning of the treatment field are important. The purpose of this study was to determine the degree of distortion in images obtained by digital subtraction angiography(DSA) and to assess whether DSA is a suitable may substitute for MRI in the planning of stereotactic radiosurgery. MATERIALS AND METHODS: After designing DSA phantoms we obtained images under variable conditions and analyzed image distortion using an image analysis program. RESULT: DSA imaging distortion increased as intensifying tube size became greater and the distance between tube and object decreased. CONCLUSION: Images obtained by DSA imaging were very distorted, and in the planning of stereotactic radio-surgery DSA is not, therefore, a suitable substitute for MRI.
Angiography, Digital Subtraction
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Magnetic Resonance Imaging
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Radiosurgery
6.Evaluation of renal donors and recipients using intravenous digital subtraction angiography
Journal of the Korean Radiological Society 1986;22(2):229-237
Renal IV DSA was applied to evaluate 15 potential renal donors and 14 examinations of 12 renal allograftrecipients,. We evaluate the angiographic acute or chronic rejection, alteration of renal size aftertransplantation, excretion time of the contrst media and pre, post DSA serum creatinine level. DSA is a safe,easily performed, out patient procedure and useful in evaluation and indistinguishing status surgical anastomosis,intrarenal vasculatures, arterial excertion time and rejection phenomenon.
Angiography, Digital Subtraction
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Creatinine
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Humans
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Tissue Donors
8.A Phantom Study for Revealing Factors Related to Image Distortion of Three-Dimensional Reconstruction Rotational Angiogram.
Bae Ju KWON ; Moon Hee HAN ; Seung Rho LEE ; Chang Kok HAHM ; Hee Chan KIM ; Kee Hyun CHANG
Journal of the Korean Radiological Society 2004;50(3):159-165
PURPOSE: To determine, by means of a phantom study, the distortion-related factors and appropriate iodine concentration for three-dimensional reconstruction rotational angiography. MATERIALS AND METHODS: Four phantoms were created: crossed metal rods, one metal rod, one contrast rod, and a contrast rod under water. Iodine concentrations were 300, 250, 200, and 150 Img/ml, respectively. For each phantom, rotational angiography was performed in the rotational, right-angled (90 degree to rotational), intermedial (45 degree), close to rotational (20 degree), and close to right-angled (70 degree) planes. Two-dimensional projection images were transferred to a workstation at which 3D images were produced using the volume rendering technique. Image quality in each plane was evaluated in terms of opacity, homogeneity, and margin sharpness, which were graded as low, intermediate or high by two neuroradiologists who used images obtained in the right-angled plane as the standard reference. The same assessors evaluated in terms of the same parameters, cross-sectional images obtained at the central, intermedial, and peripheral portions of one metal rod positioned in the right-angled, close to right-angled, and intermedial planes, and in order to compare the values at different sites, one neuroradiologist measured the horizontal and vertical diameters of each cut image. RESULTS: Three-dimensional images of all four phantoms were high quality in the close to right-angled and intermedial plane, but in the rotational and close to rotational plane were degraded. In particular, metal rod images obtained in the rotational plane were poor for all three items. In these two planes, image quality was better for the contrast rod than the metal rod, and at 200 and 250 Img/ml concentrations than at 300 and 150 Img/ml concentrations. There was no significant difference in image quality, nor in measured values of the diameter between cut images. CONCLUSION: A three-dimensional image was more distorted when a linear object was placed at a lesser angle to the rotational plane and when inherent X-ray attenuation was greater, a finding which must be closely related to the beam-hardening artifact. Distortion was least at 200-250 Img/ml of iodine concentration, the concentration thought to be most appropriate for in-vitro 3D angiography.
Angiography
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Angiography, Digital Subtraction
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Artifacts
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Imaging, Three-Dimensional
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Iodine
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Water
9.Clinical Applications of Digital Subtraction Angiography(DSA) in Neurosurgical Field.
Seong Hyung KIM ; Sun Gwan CHOI ; Bark Jang BYUN ; In Soo LEE
Journal of Korean Neurosurgical Society 1985;14(1):93-102
Methods for the identification and amplification of signals from quantities of intravascularly administered iodinated contrast agent and their combination with image subtraction have evolved into a clinically useful technique called digital subtraction angiography (DAS). The initial motivation for the development of DSA was the desire to replace standard conventional angiographic procedures with simpler, less invasive techniques. We have evaluated IV-DSA and IA-DSA which are made in 150 patients with clinically suspected intracranial diseases from Dec. 1983 to Mar. 1985. Comparison with IA-DSA and conventional angiography indicated that the quality and information of content of the film were equivalent. IV-DSA image quality was inferior to that of conventional angiography. But IV-DSA can be used for intracranial studies to evaluate results of surgery of aneurysm, AVM or tumor and to revaluate vasospasm after subarachnoid hemorrhage before surgery. Also, IV-DSA can be used for neck vessel appearance due to reveal adequate information.
Aneurysm
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Angiography
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Angiography, Digital Subtraction
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Humans
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Motivation
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Neck
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Subarachnoid Hemorrhage
10.A Clinical Significance of lntraarterial Digital Subtraction Angiography in Renal Diseases.
Korean Journal of Urology 1986;27(4):518-524
Intraarterial digital subtraction angiography(IADSA) was developed to subjugate the disadvantages of intravenous digital subtraction angiography(IVDSA). Recently, its utility has been increased in renal diseases. For investigation of clinical significance of IADSA in renal diseases, we analysed with 22 patients that renal IADSA had been performed in during the period from May, l984 to January, l986. The following results were obtained; l. Indications of the renal IADSA were renal bleeding, flank mass, hypertension and abnormality IVP or RGP only. 2. Diagnostic accuracy of the renal IADSA in renal diseases was 82.4%. 3. Renal toxicity and pain could be reduced due to decreased dose and dilution of contrast material. 4. Utilization of embolotherapy was increased because of better imaging of the renal vascularity and shortened examination-time of renal IADSA. 5. Renal IADSA can be substituted for conventional renal angiography and renal IVDSA in almost all renal diseases.
Angiography
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Angiography, Digital Subtraction*
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Embolization, Therapeutic
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Hemorrhage
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Humans
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Hypertension