Int J Comput Assist Radiol Surg - Super-resolution variable-dose imaging in digital radiography: quality and dose reduction with a fluoroscopic flat-panel detector.

Tópicos

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Resumo

RPOSE: Super-resolution (SR) image processing produces a high-resolution image from a series of low-resolution images. The aim of this study was to evaluate SR-images based on fluoroscopic flat-detector (FD) acquisition at different frame rates.METHODS: Fluoroscopic FD-sequences with 20 frames were obtained with varying pulse frequencies of (1) a line pair resolution phantom; (2) a low-contrast resolution phantom, and (3) a human knee specimen. Super-resolution digital radiographs (SR-Radiographs) were generated from each sequence. Variable-dose images were simulated by constructing SR-Radiographs using 6 and 12 frames from the corresponding fluoroscopic sequence. "Single Shot" and Computed Radiography (CR) images were obtained for comparison based on dynamic range and sharpness of bone detail structures. Patient-derived SR-Radiographic images were constructed to demonstrate clinical examples.RESULTS: The spatial resolution of SR-radiographs obtained at 12.5 frames per second (fps) and 6 fps were comparable with CR and "Single Shot" images, providing ~3.5 line pairs per mm (l p/mm). Similarly, low-contrast resolution of SR-radiographs obtained at 12.5, 6, and 30 fps were equivalent to CR and "Single Shot" images. The human knee specimen SR-radiograph obtained using 12 FD images at 12.5 fps was superior to a CR image in overall image quality, with a dose reduction of 75%. Variable-dose SR-radiographic simulations suggest a dose saving potential of 90-95% when using 6 FD images at 12.5 fps or 6 fps, respectively.CONCLUSIONS: The phantom testing images and simulation results demonstrate that diagnostic quality SR-radiographic images of skeletal extremities can be synthesized using a flat-panel detector system designed primarily for angiography. SR-images obtained with substantially reduced radiation dose are feasible, and this technology may improve digital radiography for pediatric, neonatal radiography, or mammography applications. Further testing is needed to validate super-resolution techniques in other body regions and for different flat-detector systems.

Resumo Limpo

rpose superresolut sr imag process produc highresolut imag seri lowresolut imag aim studi evalu srimag base fluoroscop flatdetector fd acquisit differ frame ratesmethod fluoroscop fdsequenc frame obtain vari puls frequenc line pair resolut phantom lowcontrast resolut phantom human knee specimen superresolut digit radiograph srradiograph generat sequenc variabledos imag simul construct srradiograph use frame correspond fluoroscop sequenc singl shot comput radiographi cr imag obtain comparison base dynam rang sharp bone detail structur patientderiv srradiograph imag construct demonstr clinic examplesresult spatial resolut srradiograph obtain frame per second fps fps compar cr singl shot imag provid line pair per mm l pmm similar lowcontrast resolut srradiograph obtain fps equival cr singl shot imag human knee specimen srradiograph obtain use fd imag fps superior cr imag overal imag qualiti dose reduct variabledos srradiograph simul suggest dose save potenti use fd imag fps fps respectivelyconclus phantom test imag simul result demonstr diagnost qualiti srradiograph imag skelet extrem can synthes use flatpanel detector system design primarili angiographi srimag obtain substanti reduc radiat dose feasibl technolog may improv digit radiographi pediatr neonat radiographi mammographi applic test need valid superresolut techniqu bodi region differ flatdetector system

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