Sn filters from 0. Recent research, both experimental and theoretical, has shown that CE-DBT is feasible in clinical practice at radiation doses equivalent to conventional mammography. A theoretical model was used to determine the optimal thickness of the Sn and Cu filters, dose allocation between the LE and HE images, and mean glandular dose.
A very high X-ray flux is utilized in many of these applications. The images were acquired with a W target at 49 kV. In order to reduce power consumption the shortest possible connections to detector pixels lowest stray capacitance are considered.
However, densely packed multi-channel fast electronics lead to large power consumption and the resulting heat needs to be dissipated to ambient without negatively affecting the detection system.
Systems based on this new detector technology can provide compositional analysis of tissue through spectroscopic X-ray imaging, significantly improve overall image quality, and may significantly reduce X-ray dose to the patient. Also, detectors with multiple layers may be more expensive to produce.
Introduction There is a need for the development of novel detector technologies for photon-counting in X-ray imaging. There are merits and limitations inherent with each of the four approaches.
As previously described, 4 we propose a system design where LE and HE images are acquired in a single scan in which alternate slits of the multislit prepatient collimator are covered with Sn and Cu. Drift structures allow the collection of electrons from larger volumes on a small anode [ 14 ], [ 15 ].
Another strategy to shorten the signal duration is the implementation of parallel drift structures [ 13 ]. To illustrate the feasibility of the technique, DE-DBT images of a structured phantom containing iodine disks were assessed.
We, as well as others, have investigated a number of strategies pursuing the development of detector structures and electronic readouts that are capable of a maximum output count rate sufficient for CT imaging. This approach has a number of disadvantages related to the interconnections between the various layers and readout electronics.
Photon-counting can provide similar improvements to CT provided that sufficient performance detectors can be developed.
More electrodes and smaller dimensions may increase the difficulties involved in electrically connecting the sensor to ASICs. High flux is required in order to collect sufficient photon statistics in the measurement of the transmitted flux attenuated beam during the very short time frame of a CT scan.
There are a number of applications that can greatly benefit from these novel imagers including mammography, planar radiography, and computed tomography CT. There are number of detector structures that have been proposed over the years to improve performance of CdTe and CZT detectors including for example co-planar grids contact configuration [ 9 ].
Low-energy LE and high-energy HE images are acquired in a single scan by covering alternate slits of a multislit prepatient collimator with Sn and Cu, respectively.
Additionally, the first clinical CT images, taken with several of our prototype photon-counting and energy-dispersive detector modules, are shown.We present the first evaluation of a recently developed silicon-strip detector for photon-counting dual-energy breast tomosynthesis.
The detector is. A photon-counting silicon strip detector with two energy thresholds was investigated for spectral X-ray imaging in a mammography system. Preliminary studies already indicate clinical benefit of the detector, and the purpose of the present study is optimization with respect to energy resolution.
A multislit photon-counting tomosynthesis system was utilized (spectral imaging) to produce both low- and high-energy tomographic data (below and above the k edge of iodine, respectively) in a single scan, which allowed for dual-energy visualization of iodine.
Abstract We present the first evaluation of a recently developed silicon-strip detector for photon-counting dual-energy breast tomosynthesis. The detector is well suited for tomosynthesis with high dose efficiency and intrinsic scatter rejection.
Dual-energy mammography based on a photon-counting detector was simulated. • Radiation dose and image quality were evaluated for optimizing the proposed technique. The raw data sets are processed with a dual energy calibration technique that enables projection space reconstruction and eliminates the beam hardening effect.
Olla H, Penton E, Rantanen J, Solokov S, Weber N, Westerberg H. Evaluation of a photon-counting breast tomosynthesis imaging system. Med ImagProc SPIE.