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Influence on Visibility Due to Differences of Guide Wire Movement―Visual & Physical Evaluations

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Document pages: 15 pages

Abstract: The visibility of moving images during cardiaccatheterization and treatment may be reduced by a number of factors. First, itinvolves multiple movements that occur simultaneously, such as the movementsdue to the heart beat and movement of the guide wire used during the treatment.There is also the influence of the X-ray dose on the image quality in the X-rayoutput. If X-rays are irradiated onto moving objects such as a guide wiremoving during treatment of the heart, cardiac catheterization may be displacedto the next image recorded even when an insufficient X-ray dose has beenirradiated because the imaged object is moving during the time the X-rays areemitted (pulse width). If the X-ray dose planned to be irradiated to the targetis low, there is also the possibility that noise will appear in the image, andthe imaged object may be lost in noise and visibility be reduced. For thisreason, we conducted basic research into how changes in the speed of rotationof guide wires affect visibility when wires are positioned horizontally andvertically, using a dynamic phantom and recorded X-ray moving images. Thepurpose of this study is to elucidate whether the deterioration in thevisibility is affected by the X-ray dose, the orientation or movement of aguide wire, or caused by other conditions, in order to contribute to improvingthe visibility in the X-ray moving images. The results showed a lower visualevaluation only in the vertical direction at the more rapid movement here, butthis did not result in significant changes in the physical evaluation. Thissuggests that the structure and characteristics of the human eyes would beinvolved, as human vision is stronger with lateral movements and weaker withvertical movements due to the arrangement of the human eyes, side by side.Findings from this basic study can be utilized to improve the visibility in theX-ray moving images by paying attention to the observation environment of theobserver of the X-ray moving images. In addition, the findings of this studycan also be used to determine protocols for improving visibility in X-raymoving images, such as adjusting the X-ray dose in an X-ray device when furtherimprovement is required. Therefore, this study was able to provide suggestionsto contribute to the development of improved visibility of X-ray moving images.

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