Quantitative Evaluation of Catheter Radiopacity by Fiber Optic Scanning Densitometry

Autor: D. D. Solomon, M. J. Lipton, M. P. Byron
Rok vydání: 1987
Předmět:
Zdroj: MRS Proceedings. 110
ISSN: 1946-4274
0272-9172
Popis: A rapid accurate method has been developed utilizing fiber optic scanning densitometry to quantify the radiopacity of vascular catheters. The technique provides for computerized calculation of relative catheter radiopacity and an appropriate control standard. A densitometer with a 180 degree collection angle for diffuse transmission density measurements was selected based on the diffusing nature of x-ray film (Q-factor 1.80). A benchmark catheter and 2 mil thick brass shim stock were selected as control standards for evaluation of mono- and multilumen tubing using standard x-ray conditions and an aluminum block attenuator.Results from reproducibility studies show scan-to-scan repeatability is within ±1%, and day-to-day variability is less than 5%. Application studies demonstrated a linear relationship between percent barium sulfate loading and the radiopaqueness of 16 gauge monolumen tubing. Results were also obtained from a clinical chest x-ray film showing good in vivo/in vitro correlation. The amount of radiopaque filler, design and orientation of the radiopaque region of the catheter was found to be critical in obtaining optimum catheter radiopacity.This method provides a quantitative technique which permits precise evaluation of vascular access devices as compared to the qualitative evaluation provided by methods such as ASTM F 640.
Databáze: OpenAIRE
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