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Comparison of Digital Acquisition Exposure Rates for Neurology Protocols

T Slauter*, D Sandoval , R Lamoureux , R Selwyn , University of New Mexico Hospital, Albuquerque, NM


(Monday, 7/30/2018) 3:45 PM - 4:15 PM

Room: Exhibit Hall | Forum 1

Purpose: To determine the difference in exposure rates and image quality of interventional/angiography systems for neurology protocols between different dose settings and amongst multiple vendors.

Methods: Exposure rates and image quality were obtained from four different units: Philips Allura Xper FD20/20 (Normal and ECO dose modes), Philips Allura Clarity FD20/10, Siemens Artis Q Biplane, and GE Discovery IGS740. Data was collected from the frontal tubes only. For reproducibility, the following setup was utilized: SID = 100 cm and solid-state R/F sensor placed 30 cm from the detector. A phantom constructed of 2 mm copper and 6 mm plastic was placed between the sensor and image detector to simulate a patient. Exposures were taken at each available protocol, magnification, dose mode and multiple pulse rates (if available). Each exposure lasted roughly 5 seconds, giving the sensor time to reach a steady state. Image quality was determined for the highest and lowest magnification modes for each protocol utilizing the aforementioned phantom and a high contrast resolution tool.

Results: Comparing similar pulse rates and magnification modes between all four units, GE had the lowest exposure rate and the poorest resolution (3 lp/mm). When comparing exposure rates between Philips units, for all magnification modes and pulse rates, ECO is approximately 50% lower while Clarity is approximately 80% lower when compared to Normal mode while maintaining high resolution (4 lp/mm). Overall, Philips Clarity had the best combination of low exposure rate and good high contrast resolution.

Conclusion: Lowering patient dose is an important goal and new low dose protocols are provided by each vendor. Image quality should be maintained in order to justify the lower dose and to ensure good patient outcomes. Understanding how vendors and imaging modes affect the exposure rate and image quality is important for physicians who routinely operate interventional equipment.


Not Applicable / None Entered.


IM- X-ray: Fluoroscopy, digital angiography, and DSA

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