Comparison of analog and digital magnification in x-ray fluoroscopy image sequences

Yogesh Srinivas; David L. Wilson

doi:10.1117/12.462670

12 April 2002 Comparison of analog and digital magnification in x-ray fluoroscopy image sequences

Yogesh Srinivas, David L. Wilson

Proceedings Volume 4686, Medical Imaging 2002: Image Perception, Observer Performance, and Technology Assessment; (2002) https://doi.org/10.1117/12.462670
Event: Medical Imaging 2002, 2002, San Diego, California, United States

Abstract

Radiologists resort to image magnification in x-ray fluoroscopy to better visualize small interventional devices. Image intensifier (II) systems use analog magnification with x-ray exposure inversely proportional to the area of field of view (FOV) so as to maintain light output for the camera. Flat-panel (FP) detector images can only be magnified using digital interpolation. We quantitatively investigated image quality of digital and analog magnification using a task of detecting a partially deployed stent in simulated x-ray fluoroscopy image sequences. Exposure for FP magnification was varied in an adaptive forced choice experiment so as to match performance with II magnification. II exposure was set at a nominal value of 5.0 (mu) R per frame at 23 cm FOV and using the standard exposure strategy, increased to 9.15 and 13.49 (mu) R per frame at 17 and 14 cm FOV, respectively. Image quality improved 1.44 +/- 0.065 and 1.64 +/- 0.073 times by going to the 17 and 14 cm FOV, respectively. For equivalent image quality, FP required 4.00 +/- 0.30, 9.50 +/- 0.62, and 9.85 +/- 0.64 (mu) R per frame at normal, mag-1 and mag-2, respectively. As compared to II, FP gives significant dose savings of 20 +/- 6% and 27 +/- 5% at the normal and highest magnification modes, respectively. A human-observer model describes results and can be used to predict results for similar acquisition and processing methods.

Citation Download Citation

Yogesh Srinivas and David L. Wilson "Comparison of analog and digital magnification in x-ray fluoroscopy image sequences", Proc. SPIE 4686, Medical Imaging 2002: Image Perception, Observer Performance, and Technology Assessment, (12 April 2002); https://doi.org/10.1117/12.462670

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