2.Digital Subtraction Angiography(DSA)の機械的artifactの検討(I.Digital Subtraction Angiographyの臨床利用について)(第12回放射線技術)

概要

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Among many factors influencing the image quality of the Digital Subtraction Angiography (DSA) image, the artifact due to the mechanical misregistration by mask image and live image was examined. Misregistration, as this is well known by the patient's motion artifact, is used here as the meaning of the spatial shift between the mask image and the live image. In DSA study, mild shift as small as one tenth of a pixel produces an artifact. According to our examinations, the quality of the DSA image is largely fluctuation of power voltage and electrostatical transfer phenomenon in I.I. image. Especially, this phenomenon is recognized about 20 seconds after the start of the X-ray exposure. We must consider the recording time of interval between the mask image and the live image. We hope this paper is contributory to the improvement of I.I. for DSA.
1985-03-01