Quality Analysis of DSA Equipment
In the framework of a quality analysis project the image quality (IQ) and related radiation dose were measured in constructively different DSA equipments in 6 hospitals in the Netherlands. The aim of this work was to develop a simple method for qualification and quantification of image quality, to establish the differences in the equipments and to develop recommandations for improvement. The structure of our investigation was as follows. For dose measurements in the 6 hospitals a human phantom was used to measure the surface dose at the level the thyroid gland using TLD dosimeters. The validity of the use of this phantom was established before in our hospital. We therefore compared the dose measurements on the level of the eye lenses and the thyroid gland on the human phantom with same measurements on 27 patients during a standardized DSA and conventional angiography (CA) of the aortic arch and brachiocephalic arteries. The image quality was measured on a monitor and a hard copy image after optimizing fluoroscopy using a contrast-detail (CD) phantom consisting of a plate of 1 cm of bakelite with dimensions of 26 by 26 cm embedded in 14 cm of perspex. Also the entrance dose on this phantom was measured. In each hospital the IQ parameters of the monitor and hard copy images of the CD phantom were correlated with the entrance dose of the CD phantom and the thyroid dose of the human phantom.
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