A data set of ? A simultaneous algebraic reconstruction technique with multiscale bilateral filtering MSBF regularization was used to enhance microcalcifications and suppress noise. During the MSBF regularized reconstruction, the DBT volume was separated into high frequency HF and low frequency components representing microcalcifications and larger structures. At the final iteration, maximum intensity projection was applied to the regularized HF volume to generate a PPJ image that contained MCs with increased contrast-to-noise ratio CNR and reduced search space.
In principle, a stationary digital breast tomosynthesis s-DBT system has better image quality when compared to continuous motion DBT systems due to zero motion blur of the source. The authors have developed a s-DBT system by using a linear carbon nanotube x-ray source array.
The purpose of the current study was to quantitatively evaluate the performance of the s-DBT system; and investigate the dependence of imaging quality on the system configuration parameters.
Physical phantoms were used to assess the image quality of each configuration including inplane resolution as measured by the modulation transfer function MTFinplane contrast as measured by the signal difference to noise ratio SdNRand depth resolution as measured by the z-axis artifact spread function.
Five parameters were varied to create five groups of configurations: It was found that the z-axis depth resolution increased with the total angular span but was insensitive to the number of projection images, mAs distribution, entrance dose, and detector pixel size. The SdNR was not affected by the angular span or the number of projection images.
A decrease in SdNR was observed when the mAs was not evenly distributed across the projection images.
As expected, the SdNR increased with entrance dose and when larger pixel sizes were used. For a given detector pixel size, the inplane resolution was found to be insensitive to the total angular span, number of projection images, mAs distribution, and entrance dose. The results suggest that the optimal imaging configuration for a s-DBT system is a large angular span, an intermittent number of projection views, and a uniform mAs distribution over all views.
With the detector operating at full resolution, a stationary DBT system can achieve an inplane resolution of 5. This number drops to This leads to high false positive and false negative rates.
This added depth information allows for otherwise obscured lesions to become visible. Current DBT systems use a single x-ray source which is rotated over a limited angle arc. The x-ray source rotates in a continuous motion 1011 or using a step-and-shoot motion.
A blurred focal spot decreases the spatial resolution of the projection images which in turn reduces the spatial resolution of the reconstructed images.
High spatial resolution is needed in mammography in order to resolve microcalcifications MCs. MCs are important because the size and shape of them can indicate the likelihood that a particular lesion is benign or malignant.
In both continuous motion and step-and-shoot DBT systems, the focal spot blurring effect can be reduced by decreasing the rotation speed and increasing the acquisition time. Results have shown that the system resolution is increased from less than 3 cycles per mm with the Selenia Dimensions DBT system to more than 4 cycles per mm with the s-DBT system 1.
Accelerated lifetime measurements demonstrate an estimated x-ray tube lifetime of over 3 years in clinical service.
Factors such as the x-ray source, detector, reconstruction algorithm, image processing method, and imaging configuration must be tested and selected in order to realize the full potential of a system. A large number of previous studies have reported on the performance of rotating source DBT systems with respect to imaging configurations.
A number of studies have reported that an increase in the angular coverage of the projection images results in an improvement of z-axis resolution.The breast tomosynthesis system was built up with fixed multi-beam field-emission x-ray (MBFEX) sources based on unique properties of carbon nanotube electron emitters .
Parallel imaging configuration was applied to multi-beam x-ray system design where the path of the x-ray tube lies in a plane that is parallel to the detector plane [1,3]. Their combined citations are counted only for the first article.
Stationary digital breast tomosynthesis system with a multi-beam field emission x-ray source array. G Yang, R Rajaram, G Cao, S Sultana, Z Liu, D Lalush, J Lu, O Zhou Carbon nanotube based X-ray sources: Applications in pre-clinical and medical imaging.
Tomosynthesis Reconstruction From Multi Beam X Ray Sources. Tomosynthesis reconstruction from multi-beam X-ray sources We investigate methods for reconstructing tomosynthesis data using arrays of microfabricated X-ray sources and area CCD detectors.
Reconstruction of blood vessels from X-ray substraction projections Tomosynthesis Reconstruction from Multi-Beam X-Ray Sources Functional Imaging in Small Animals Using Tomographic Digital Subtraction Angiography.
A new stationary intraoral tomosynthesis device being prepared for human use. The carbon nanotube‐enabled X‐ray source is shown as it will appear in the dental examination room (a) and surrounded by the equipment used to characterize its performance prior to implementation in .
Stationary digital breast tomosynthesis system with a multi-beam fleld emission x-ray source array - April · Proceedings of SPIE - The International Society for Optical Engineering A stationary digital breast tomosynthesis (DBT) system using a carbon nanotube based multi-beam field emission x-ray (MBFEX) source has been designed.