Radiopraxis 2024; 17(02): 84-93
DOI: 10.1055/a-1811-0722
CPD-Fortbildung

Pulmonalvenenisolation: Einfluss des Streustrahlenrasters auf die Patientendosis

Pulmonary Vein Isolation: Influence Of The Scattered Radiation Grid On The Patient Dose
Kerstin Hartmann
,
Lisa Techt
,
Tanja Zinkl

Die interventionelle Kardiologie/Rhythmologie gilt als Hochdosisbereich. Daher sollten laufend Optimierungsmaßnahmen im Strahlenschutz für Patient*innen und Personal durchgeführt werden. Eine mögliche Patientendosisreduktion ist, den Streustrahlenraster während der Intervention zu entfernen. In einer retrospektiven Studie wurde der Einfluss auf die Patientendosis und die Bildqualität speziell bei einer Pulmonalvenenisolation untersucht.

Abstract

In this retrospective study, the reduction of the applied patient dose after removal of the anti-scatter grid in pulmonary vein isolations and the influence on image quality were investigated. The removal of the anti-scatter grid is an effective method of dose reduction, as the use of an anti-scatter grid results in an increase in absorbed patient dose by a factor of 3–5. At the same time, image quality is reduced by removing the grid. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) can be used to evaluate the image quality of an X-ray system. The SNR is doubled when the dose is increased by a factor of 4. The Rose criterion that prescribes an SNR of≥5 was not achieved for some measurements in this study. Regarding the CNR, it was shown that the increase in tube voltage results in a lower CNR (decrease in image contrast) and by increasing the tube current, an increase in CNR occurs. This results in a decrease in contrast when the anti-scatter grid is removed. In consultation with the physician, electrophysiological examinations with the additional use of a 3D mapping system can be performed with reduced image quality and lower values for the Rose criterion can be accepted.



Publication History

Article published online:
31 May 2024

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