Aims and objectives
Objectives:
To develop novel imaging-like concept for computerized tomography (CT) yielding 3-D images with significantly reduced x-ray dose irradiated at patients without damaging the image quality.
The technological advantages of the proposed approach can be summarized in Figure 1.
Figure 1.
The advantages of the proposed technology.
The need:
The radiation dose efficiency of existing CT systems is relatively low.
There is an exposure of not only the patients but also for the medical staff.
Several health organizations and regulatory authorities already set a goal...
Methods and materials
Method description:
The imaging-like concept includes x-ray source beam-shaping module irradiating the patient without using collimators array.
Then,
time-changing array of pinholes is positioned in front of the x-ray detector to perform high-resolution 3-D imaging of the inspected patient.
The reconstruction includes applying a modified mathematical Radon transformation and proper data decoding done in the spatial Fourier domain.
In Figure 2 we summarize the schematics of the operation method.
Figure 2: The schematic description of the operation method.
The reduction in the required radiation dose...
Results
The proposed imaging-based CT system was physically modeled and simulated via Geant4 software and then validated via an experimental prototype that was constructed and demonstrated the feasibility and the operability of the proposed novel approach.
In Figure 5(a) we present the experimental x-ray configuration.
It includes the x-ray flat detector with our mask (the mask of LensFree ltd),
the rotated phantom based on 2 nails and the x-ray source.
In Figure 5(b) we show the phantom’s orientation: the phantom is rotated while the x-ray source,...
Conclusion
· In this presentation we showed a novel concept to do radiation reduced CT scans.
The concept includes x-ray source beam-shaping and using time changing array of holes.
The proposed concept was validated numerically (via Geant4) and experimentally and it has demonstrated the capability of reducing the radiation efficiency by more than an order of magnitude,
being highly significant in radiology and for CT scans.
The concept was also experimentally demonstrated as being advantageous for gamma imaging (SPECT).
In Figure 14 we present a summary...
Personal information
Dr.
Doron Avraham is a co-founder and the CEO of LensFree.
He is an experienced system engineer that already successfully led several technological products toward mass production.
Doron led the mobile devices products at Inuitive,
a 3D imaging SU.
Prior to that,
he served as physicist and technical manager at Orbotech (NASDAQ – ORBK).
Doron holds a B.Sc.
and M.Sc.
degrees in Physics and a PhD in ElectricalEngineering from Bar-Ilan University.
Dr.
Yossef Danan is an R&D senior engineer at LensFree.
He finished his B.Sc,...
References
A.
Schwarz,
A.
Zlotnik,
Y.
Kapellner Rabinovitz,
H.
Pinhas,
A.
Shemer and Z.Zalevsky,
“Computational imaging expansion from visible to infrared and to THz systems,” Proc.
SPIE.
9761,
Emerging Digital Micromirror Device Based Systems and Applications VIII (2016).
A.
Schwarz,
A.
Shemer and Z.
Zalevsky,
“Light Intensity and SNR Improvement for High Resolution Optical Imaging via Time Multiplexed Pinholes Arrays,” Appl.
Opt.
53,
4483–4492 (2014).
A.
Schwarz,
A.
Shemer,
and Z.
Zalevsky,
“Nuclear 3D Gamma and X-Ray Imaging using Variable Pinholes Array System,” Imaging Systems and...