Real time implementation of anti-scatter grid artifact elimination method for high resolution x-ray imaging CMOS detectors using Graphics Processing Units (GPUs)

Rana, R; Nagesh, Swetadri Vasan Setlur; Bednarek, Daniel R.; Rudin, Stephen

doi:10.1117/12.2254120

Cited by 2 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously it was shown that by first subtracting the residual scatter from the image and then by logarithmic subtraction of the reference image of the grid, grid artifacts can be eliminated [2,3]. The residual scatter was recursively derived from an initial scatter estimate obtained by placing lead beads on the test object being imaged.…”

Section: Introductionmentioning

confidence: 99%

Anti-scatter grid artifact elimination for high-resolution x-ray imaging detectors without a prior scatter distribution profile

Nagesh

Rana

Bednarek

et al. 2018

Medical Imaging 2018: Physics of Medical Imaging

View full text Add to dashboard Cite

Using anti-scatter grids with high-resolution imaging detectors could result in grid-line artifacts, with increasing severity as detector resolution improves. Grid-line mask subtraction can result in residual artifacts that are due to residual scatter penetrating the grid and not subtracted. By subtracting this residual scatter, the grid artifacts can be minimized. In the previous works, an initial residual-scatter estimate was derived by placing lead markers on a test object; however, any change in the object geometry requires a new scatter estimate. Such a method is impractical to implement during a clinical procedure. In this work, we present a new method to derive the initial scatter estimate to eliminate grid-line artifacts during a procedure. A standard stationary Smit-Roentgen x-ray grid (line density - 70 lines/cm, grid ratio - 13:1) was used with a high-resolution CMOS detector (Dexela Model 1207, pixel size - 75 μm) to image an anthropomorphic head phantom. The initial scatter estimate was derived from the image itself and the grid artifacts were eliminated using recursive correction estimation; this result was compared to that with the estimate derived from placing lead markers on the phantom. In both cases, the contrast-to-noise ratio (CNR) was improved compared to the original image with grid artifacts. Percentage differences in CNR’s for three regions between the images corrected with the two estimates were less than 5%. With the new method no a priori scatter distribution profiles are needed, eliminating the need to have libraries of pre-calculated scatter profiles and making the implementation more clinically practical.

show abstract

Section: Introductionmentioning

confidence: 99%

Anti-scatter grid artifact elimination for high-resolution x-ray imaging detectors without a prior scatter distribution profile

Nagesh

Rana

Bednarek

et al. 2018

Medical Imaging 2018: Physics of Medical Imaging

View full text Add to dashboard Cite

show abstract

A new software scheme for scatter correction based on a simple radiographic scattering model

Kim

Kang

Kim

et al. 2018

Med Biol Eng Comput

View full text Add to dashboard Cite

In common radiography, image contrast is often limited due mainly to scattered x-rays and noise, decreasing the quantitative usefulness of x-ray images. Several scatter reduction methods based on software correction schemes have been extensively investigated in an attempt to overcome these difficulties, most of which are based on measurement, mathematical-physical modeling, or a combination of both. However, those methods require special equipment, system geometry, and extra manual work to measure scatter characteristics. In this study, we investigated a new software scheme for scatter correction based on a simple radiographic scattering model where the intensity of the scattered x-rays was directly estimated from a single x-ray image using a weighted l-norm contextual regularization framework. We implemented the proposed algorithm and performed a systematic simulation and experiment to demonstrate its viability. We also conducted some clinical image studies using patient's image data of breast and L-spine to verify the clinical effectiveness of the proposed scheme. Our results indicate that the degradation of image characteristics by scattered x-rays and noise was effectively recovered by using the proposed software scheme, thus improving radiographic visibility considerably. Graphical abstract The schematic illustrations of scatter suppression methods by using a an antiscatter grid and b a scatter estimation algorithm.

show abstract

Real time implementation of anti-scatter grid artifact elimination method for high resolution x-ray imaging CMOS detectors using Graphics Processing Units (GPUs)

Cited by 2 publications

References 9 publications

Anti-scatter grid artifact elimination for high-resolution x-ray imaging detectors without a prior scatter distribution profile

Anti-scatter grid artifact elimination for high-resolution x-ray imaging detectors without a prior scatter distribution profile

A new software scheme for scatter correction based on a simple radiographic scattering model

Contact Info

Product

Resources

About