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OPTIMIZING PARAMETERS FOR FLAT-PANEL DETECTOR DIGITAL TOMOSYNTHESIS

Digital tomosynthesis combines the benefits of digital imaging [1, ..
“Optimizing parameters for flat-panel detector digital tomosynthesis,”.


OPTIMIZING PARAMETERS FOR FLAT-PANEL DETECTOR DIGITAL TOMOSYNTHESIS

Contents:

References Optimizing Parameters for Flat-Panel Detector Digital Tomosynthesis
Learning objectives 28 - Optimization of 2D and 3D Radiographic Imaging Systems



This information, along with other information the pre-tomosynthesis image may
provide, may be used by computer 40 , or by the operator in a semi-automatic
mode, as a basis for optimizing the parameters or characteristics of subsequent
acquisitions. For example, the information provided by the pre-tomosynthesis
image may be used as a basis for optimizing the energy level of the x-rays used
in the subsequent acquisitions, the pulse duration, the tube current, the tube
current duration, etc. The pre-tomosynthesis image may be acquired using an
equal or lower dose of x-rays than is used to acquire images in later steps in
imaging chain described below.

According to one embodiment, the image generated during sub-step may not be
utilized during the reconstruction process described below. According to another
alternative embodiment, sub-step may not be part of step and may not be included
in imaging chain According to another alternative embodiment, the information
provided by any image acquired during the tomosynthesis process may be used as a
basis for optimizing the acquisition parameters or characteristics of subsequent
acquisitions. At sub-step e.


REFERENCES

These parameters relate to the field of view, the method used to control the
dose of the x-rays, the energy level of the x-rays, how the x-ray source will be
moved during the acquisitions, whether the acquisition will require a field of
view larger than the detector area, the acquisition paths of the source and
detector, the slice characteristics, and the presence or absence of an
anti-scatter grid. The field of view may be selected by specifying a region of
interest within the localizer acquisition taken in sub-step This may be done
interactively on computer 40 , which displays the localizer acquisition, by
indicating where in the resulting image the x-rays should be targeted or
focused.

The field of view may also be selected by specifying and entering coordinates
consisting of reference points defined relative to the patient. In addition, a
volume of interest within the patient may be defined by specifying a region of
interest in the image as well as a start and end height above the detector e.
The number of slices to be reconstructed and the slice separation may also be
defined. Slice separation may be predetermined, determined by the acquisition
configuration e.

In combination with the volume of interest, a variable-opening collimator may be
controlled so as to optimally cover the volume of interest, while minimizing the
dose of x-rays received by the patient. There are at least three methods that
may be used to control the dose of x-rays received by the patient.

The first method is to use ion chambers to automatically control the exposure of
the patient to x-rays. The third method is to automatically calculate an optimal
dose using information from the localizer image or from a previous acquisition
in the series of acquisitions acquired during the tomosynthesis process.
According to alternative embodiments, other conventional methods of controlling
the dose of x-rays received by a patient or subject may be used. The energy
level of the x-rays can be set to a single energy level or to multiple energy
levels. For example, at each position and angle of acquisition, a single image
can be acquired at a specific energy level, or several images can be acquired at
different energy levels.

Moreover, the energy level may also vary as a function of the projection angle.
With respect to selecting how the x-ray source will move during acquisitions,
the acquisition can be made while the x-ray source is moving e. To achieve
better image quality, or minimize required corrections, the detector may be
tilted towards the incident x-ray beam. If a large field of view e. In an
alternative embodiment, the acquired images are used to reconstruct more than
one volume of interest, and the pasting or stitching is performed after the 3D
reconstruction.

The paths along which the source and detector travel during the process of
acquiring images may also be defined. These paths which may be one-dimensional,
two-dimensional, three-dimensional, etc. Moreover, factors such as the type of
clinical application, the portion of the anatomy that is of interest, the volume
that is of interest, and the size of the patient may be taken into account in
selecting the desired path.

Other parameters that may be adjusted relate to the slice characteristics. These
parameters relate to the number of slices, the slice thickness which may be
variable or fixed , the slice orientation e. It is also possible to reconstruct
on non-planar slices, where the shape or curvature of the slices may be adapted
to the anatomy to be imaged. Still another parameter or option that may be
selected is whether to include the anti-scatter grid. If an anti-scatter grid is
selected, one of a plurality of available grids may then be selected.

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At sub-step , the time at which images are acquired is linked to certain
physiological signals or events, which is referred to as physiologic gating.
Physiologic gating helps to maintain uniformity between the different
acquisitions and to increase the quality of the results of the tomosynthesis
process.

According to one embodiment, a physiological signal such as a patient's heart
rhythm EKG or breathing cycle is detected and is used as a basis for triggering
the acquisition of images. According to this embodiment referred to as
prospective physiologic gating , the timing of the acquisition of images is
linked to the physiological events such that acquisitions are taken at certain
points or at certain intervals in the physiologic cycle. According to another
embodiment, the physiological events are recorded at the time acquisitions are
taken.

According to this embodiment referred to as retrospective physiologic gating ,
the point or interval of the physiological cycle at which the patient is in when
the images are acquired is taken into account in the reconstruction and
processing of the images in the later steps of imaging chain According to
another alternative embodiment, sub-step is not included within imaging chain At
sub-step an acquisition is taken according to the settings selected and applied
in the previous steps.

Then at sub-step , the acquisition parameters are adjusted and another
acquisition is taken. Such adjustments to the acquisition parameters may
include, but are not limited to, adjustments to the x-ray technique parameters
e. These adjustments are made to provide the variety of different images e.

In making these adjustments, the x-ray technique parameters may be the same e.
If adjustments are made to the x-ray technique parameters between any of the
images, the adjustments may be based on information acquired from the
pre-tomosynthesis image, on information acquired from any previous image or
images, or on other relevant information. Sub-step is repeated until a
sufficient number of images e. The acquisition of a sufficient number of images
from different perspectives or acquisition angles allows computer 40 to
construct a three-dimensional dataset by suitably combining the individual
datasets that are represented by particular images.

According to alternative embodiments, the acquisitions may be taken while the
detector is moving or while the detector is stationary. As illustrated in FIG.
Step e.

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Like step , step can be broken down into a number of different sub-steps, which
are illustrated in FIG. At sub-step , various corrections e. At sub-step ,
intensity corrections are made. Intensity corrections may also include
corrections to the sensitivity map of the detector, corrections to offset the
effects of Modulation Transfer Function MTF variations, etc.

Digital x-ray panel sensors, teardown & reverse-engineering


At sub-step , scatter corrections, which are particularly important when no
scatter grid is used during the acquisition of the images, are made to reduce
the effects of scatter. Scatter corrections can be made using scatter reduction
algorithms that use information from multiple energy images to perform the
correction.

Scatter correction can depend on the angle of acquisition or be
angle-independent. Sub-steps , , and can be used in combination to achieve
quantitative images in situations such as where the values at each pixel
correspond to the line integral of the attenuation coefficient along the
corresponding ray. Yulia M. Levakhina , Robert L.

Duschka , Florian M. Development of a denoising convolutional neural
network-based algorithm for metal artifact reduction in digital tomosynthesis
for arthroplasty: A phantom study Tsutomu Gomi , Rina Sakai , Hidetake Hara , Y
Watanabe , Shinya Mizukami. Miroshnychenko , A. Tomosynthesis must be considered
as an extension or an addition to standard radiography, as it can be performed
in the same diagnostic step. The purpose of this article was to describe the
principles, advantages and limitations, and current and future applications in
musculoskeletal pathology of tomosynthesis.

We use cookies to help provide and enhance our service and tailor content and
ads. By continuing you agree to the use of cookies. Download PDF Download. In
one solution, the sum of the volumes of the three constituent materials is
assumed to be equivalent to the volume of the mixture volume or mass
conservation [ 11 ].

In this work, we used a simple projection space prereconstruction decomposition
method to estimate the material fractions f n of the CaCO 3 fcaco3, local
density; 2. Three basis materials can also be expressed as a linear combination
of the attenuation coefficients:.

Therefore, the basis material decomposition can be accomplished by solving
simultaneous equations to calculate the values of L 1 , L 2 , and L 3 from the
measured projection pixel values [ 12 ]. We used the local and area densities
for each material to calculate the theoretical linear attenuation coefficient
curves shown in Figure 2 ; these values were generated by inputting the chemical
compositions of the CaCO 3 , epoxy resin, and PMMA into the XCOM program
developed by Berger and Hubbell [ 27 ].

Finally, we used the projection space decomposition approach to generate
material decomposition images for the CaCO 3 , epoxy resin image, and PMMA by
using the following process. These values were then used to construct a
sensitivity matrix, and the material fractions were obtained from the inverse of
this matrix Eq.

Virtual monochromatic processing is performed according to Eq. The real
projection data acquired on a DT system were used for reconstruction. A large
energy gap between low and high tube potential kVp imaging yields better
material decomposition [ 28 , 29 , 30 , 31 , 32 , 33 ]. We selected the
abovementioned kV values because this study aimed to improve contrast and
artifact reduction during DT acquisition while maintaining an imaging
performance similar to that of conventional DT. Pulsed X-ray exposures and rapid
switching between low and high tube potential kVp values were used for DE-DT
imaging.

The experiments were performed according to the scheme shown in Figure 3. A
range of optional parameters have been identified for IR algorithms. Among these
parameters, some are important for determining algorithmic behavior. In this
study, we compared the root-mean-square error RMSE and mean structural
similarity MSSIM; reconstructed volume image from the previous iterations
between the current iteration to optimize the iteration numbers i. The MSSIM of
local patterns of luminance- and contrast-normalized pixel intensity were
compared to determine the structural similarity SSIM index of contrast
preservation.


OPTIMIZING PARAMETERS FOR FLAT-PANEL DETECTOR DIGITAL TOMOSYNTHESIS

This image quality metric is based on the assumed suitability of the human
visual system for extracting structure-based information [ 34 ]. The SSIM index
between pixel values x and y was calculated as follows:.


LEARNING OBJECTIVES

Development and application of programs to measure modulation transfer function,
noise power spectrum and detective quantum efficiency. Computer 40 e. Visually
sharp reproduction of retroglandular fat tissue CC. The method also comprises
the steps of applying a first set of corrective measures to the series of
images, reconstructing the series of images into a series of slices through the
subject, and applying a second set of corrective measures to the slices. Both
dual-energy and tomosynthesis techniques offer advantages in terms of reduction
in anatomical noise. A method of creating and displaying images resulting from
digital tomosynthesis performed on a subject using a flat panel detector
comprising the steps of: optimizing parameters for flat-panel detector digital
tomosynthesis a series of x-ray images of the subject, the x-ray images being
acquired at two or more different angles relative to the subject. Figures 5b
optimizing parameters for flat-panel detector digital tomosynthesis the spectra
corresponding to this optimum point indicating a good separation of the spectra
bracketing the K-edge of iodine. It can be observed in Table 2 that most of the
compression forces used in these examinations are not adequate to the Brazilian
legislation Brasil, Advanced Application Technology Top. Rowlands, "Screen
optics effects on detective quantum efficiency in digital radiography:
Zero-frequency effects", Med. Young KC. Other features and advantages of the
invention will become apparent to those skilled in the art upon review of the
following detailed description, claims, and drawings. This website uses cookies.
On site evaluation of three flat panel detectors for digital radiography.

It was feasible to maintain a steady convergence of polychromatic IR images for
inconsistency after the fourth iteration and a convergence of monochromatic IR
images for inconsistency after the fifth iteration Figures 4 and 5. In DT, the
CNR is frequently used to estimate low-contrast detectability and was defined in
this study as follows:.

The latter parameter includes the photon statistics, the electronic noise from
the results, and the structural noise that could obscure the object. Figure 6
shows each density projection image generated by the material decomposition
process.


28 - OPTIMIZATION OF 2D AND 3D RADIOGRAPHIC IMAGING SYSTEMS

Radiographics. Mar;30(2) doi: /rg Optimizing parameters for flat-panel detector
digital tomosynthesis. Machida H(1), Yuhara T . The imaging technique for
digital tomosynthesis is reviewed, with emphasis on the standard acquisition
parameters, potential.

A novel DE virtual monochromatic image processing is performed from a density
projection image, and Figures 7 and 8 show the image generated by each
reconstruction algorithm. In the novel DE virtual monochromatic image processing
performed according to Eq. In the conventional polychromatic image, noise is
reduced in the high-voltage image.

In contrast, the depth-resolution of DT radiography 2 mm was References 1.
Functional endoscopic surgery: experience with the first patients. Int Surg ;
Optimizing parameters for flat-panel detector digital tomosynthesis.
RadioGraphics ; Digital x-ray tomosynthesis: current state of the art and
clinical potential. Phys Med Biol ; RR Breast tomosynthesis: present Vallini ,
N.


A FUNNY INCIDENT OF MY LIFE ESSAYS

Contents:

Short Essay on Funny Incident of My Life Testimonials Short Essay Funny Incident



Now this is the hardest journey because this one km from metro station to class
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She may choose to be friends with very less people but for her those people are
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So this time me and Shagun decided that no matter what we are not letting this
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Oh we felt like heroes like all the people in line looking up to us and
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SHORT ESSAY ON FUNNY INCIDENT OF MY LIFE

School is where we make so many memories; the memories are sometimes good
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WRITING B1 - U11 - complete a funny story


Thereof, confusion connects people and fills their lives with unforgettable
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We are getting along with our neighbors well and we spend much time together. It
is possible to say that we live in a friendly community. We know everything
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occurred an incident that taught us to pay more attention to the similarity of
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I opened the letter while eating my breakfast and found out that I had an uncle,
Jerry, who celebrated his 60 th birthday in a week. Yes, it was an invitation
card. I did not think about my neighbor whereas I was excited and all agog.
Memorable Incident In my Life; more. Some are still vegetables, you saw on funny
incident in your life where can still feel t e we laid a little about one of
parts for.


TESTIMONIALS

Arning points in your life. Describe a funny situation that made you. Ccess in
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Metimes a situation happening with you seems horrible!


SHORT ESSAY FUNNY INCIDENT

When I was 7 years old my mother and I were grocery shopping when we passed a
lady in one of the aisles. The funniest incident in my life. Everyone in his
life experiences some incidents good or bad. There may be the happiest, the
saddest or the funniest incident in.

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RESUME WRITING SERVICES AUSTIN TEXAS

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WRITING ASSIGNMENT RUBRIC HIGH SCHOOL

Contents:

Research paper rubric How to Make a Rubric in Less Than 5 Minutes Related Posts
Research paper rubric Teacher Sites



After grading with the rubric, graders might grade a similar set of materials
without the rubric to assure consistency. Instructors can consider
discrepancies, share the rubric and results with faculty colleagues for further
opinions, and revise the rubric for use in class. Regarding course
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Rubrics should fit on one page, so that descriptions and criteria are viewable
quickly and simultaneously. Comparing scores and quality of assignments with
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Resources Cox, G. References Andrade, H. Consultations, Observations, and
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an.

Examples and details relate to the topic and some explanation is included.
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Creative writing rubric for fables. This rubric provides a basic, uncomplicated
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TEACHER SITES

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Search for: Search
Multi-institutional evaluation of digital tomosynthesis, dual-energy .
Optimizing parameters for flat-panel detector digital tomosynthesis.