Gamma Radiation Imaging System via Variable and Time-Multiplexed Pinhole Arrays

Autor: Amir Shemer, Zeev Zalevsky, Rachel Bar-Shalom, Ariel Schwarz, Hemy Avraham, Alex Zlotnik, Yossef Danan
Rok vydání: 2020
Předmět:
Planar Imaging
coded aperture imaging
Computer science
Astrophysics::High Energy Astrophysical Phenomena
Physics::Medical Physics
Signal-To-Noise Ratio
Radiation
Single-photon emission computed tomography
lcsh:Chemical technology
01 natural sciences
Biochemistry
Article
Analytical Chemistry
law.invention
010309 optics
Optics
law
0103 physical sciences
medicine
Medical imaging
Humans
lcsh:TP1-1185
nuclear medicine
Electrical and Electronic Engineering
Radionuclide Imaging
image coding
Instrumentation
Image resolution
Tomography
Emission-Computed
Single-Photon
multipinhole collimators
medicine.diagnostic_test
Phantoms
Imaging
pinhole collimators
010308 nuclear & particles physics
Noise (signal processing)
business.industry
Collimator
Atomic and Molecular Physics
and Optics
Lens (optics)
Gamma Rays
SPECT
Pinhole (optics)
biomedical imaging
business
image resolution
Zdroj: Sensors, Vol 20, Iss 3013, p 3013 (2020)
Sensors (Basel, Switzerland)
Sensors
Volume 20
Issue 11
ISSN: 1424-8220
DOI: 10.3390/s20113013
Popis: Biomedical planar imaging using gamma radiation is a very important screening tool for medical diagnostics. Since lens imaging is not available in gamma imaging, the current methods use lead collimator or pinhole techniques to perform imaging. However, due to ineffective utilization of the gamma radiation emitted from the patient’s body and the radioactive dose limit in patients, poor image signal to noise ratio (SNR) and long image capturing time are evident. Furthermore, the resolution is related to the pinhole diameter, thus there is a tradeoff between SNR and resolution. Our objectives are to reduce the radioactive dose given to the patient and to preserve or improve SNR, resolution and capturing time while incorporating three-dimensional capabilities in existing gamma imaging systems. The proposed imaging system is based on super-resolved time-multiplexing methods using both variable and moving pinhole arrays. Simulations were performed both in MATLAB and GEANT4, and gamma single photon emission computed tomography (SPECT) experiments were conducted to support theory and simulations. The proposed method is able to reduce the radioactive dose and image capturing time and to improve SNR and resolution. The results and method enhance the gamma imaging capabilities that exist in current systems, while providing three-dimensional data on the object.
Databáze: OpenAIRE
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