Funded by the American College of Veterinary Radiology 2009 Resident Research Grant.
EVALUATION OF TWO OBJECTIVE METHODS TO OPTIMIZE KVP AND PERSONNEL EXPOSURE USING A DIGITAL INDIRECT FLAT PANEL DETECTOR AND SIMULATED VETERINARY PATIENTS
Article first published online: 14 OCT 2012
© 2012 Veterinary Radiology & Ultrasound
Veterinary Radiology & Ultrasound
Volume 54, Issue 1, pages 9–16, January/February 2013
How to Cite
Copple, C., Robertson, I. D., Thrall, D. E. and Samei, E. (2013), EVALUATION OF TWO OBJECTIVE METHODS TO OPTIMIZE KVP AND PERSONNEL EXPOSURE USING A DIGITAL INDIRECT FLAT PANEL DETECTOR AND SIMULATED VETERINARY PATIENTS. Veterinary Radiology & Ultrasound, 54: 9–16. doi: 10.1111/j.1740-8261.2012.01989.x
Presented at the American College of Veterinary Radiology 2010 Annual Scientific Meeting, Asheville, North Carolina.
- Issue published online: 7 JAN 2013
- Article first published online: 14 OCT 2012
- Manuscript Accepted: 16 AUG 2012
- Manuscript Received: 6 JUN 2012
- American College of Veterinary Radiology 2009 Resident Research Grant
Vol. 54, Issue 2, 203, Article first published online: 13 MAR 2013
- digital flat panel detector;
- figure of merit;
- signal difference-to-noise ratio;
- small animal digital radiography;
- personnel exposure
It is important to optimize digital radiographic technique settings for small animal imaging in order to maximize image quality while minimizing radiation exposure to personnel. The purpose of this study was to evaluate two objective methods for determining optimal kVp values for an indirect flat panel digital detector. One method considered both image quality and personnel exposure as endpoints and one considered only image quality. Phantoms simulated veterinary patients of varying thicknesses with lesions of varying sizes. Phantoms were exposed to a range of kVp values (60, 81, 100, and 121), using different mAs settings for each phantom. Additionally, all phantoms were exposed to a standard test exposure of 100 kVp/2.5 mAs. Scattered radiation was recorded and used as a measure of personnel exposure. When personnel exposure was considered, a figure of merit was calculated as an endpoint of optimization. The optimal kVp value for each phantom was determined based on the highest signal difference-to-noise ratio with or without inclusion of the figure of merit. When personnel exposure was not considered, increasing kVp resulted in higher signal difference-to-noise ratios and personnel exposure increased when both patient thickness and kVp increased. Findings indicated that a single standard technique of 100 kVp/2.5 mAs was only optimal for most medium-sized patients. Images of thinner patients should be made with a lower kVp. Very large patients require a higher kVp than 100 regardless of the optimization method used. Personnel exposure from optimized techniques was low and not expected to exceed annual occupational dose limits.