Coded Aperture Imaging of Gamma-Rays Using Multiple Pinhole Arrays and Multiwire Proportional Chamber Detector

Chang, Lee-Tzuu; Macdonald, B.; Perez‐Mendez, V.; Shiraishi, L.M.

doi:10.1109/tns.1975.4327665

Cited by 17 publications

(4 citation statements)

References 7 publications

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“…Therefore, even in the absence of noise, the sensitivity of such a system is strongly affected. For these reasons the NRA's have not found use in high energy astronomy, instead applications have been attempted in nuclear medicine (Chang et al, 1975;Fleming and Goddard, 1984) and in optical and infrared astronomy (Brown, 1978;Aitken et al, 1981).…”

Section: Non-and Uniformly-redundant Arraysmentioning

confidence: 99%

Coded aperture imaging in X- and gamma-ray astronomy

Caroli¹,

Stephen²,

Cocco³

et al. 1987

Space Sci Rev

375

216

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Coded aperture imaging in high energy astronomy represents an important technical advance in instrumentation over the full energy range from X-to y-rays and is playing a unique role in those spectral ranges where other techniques become ineffective or impracticable due to limitations connected to the physics of interactions of photons with matter. The theory underlying this method of indirect imaging is of strong relevance both in design optimization of new instruments and in the data analysis process. The coded aperture imaging method is herein reviewed with emphasis on topics of mainly practical interest along with a description of already developed and forthcoming implementations.

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Section: Non-and Uniformly-redundant Arraysmentioning

confidence: 99%

Coded aperture imaging in X- and gamma-ray astronomy

Caroli¹,

Stephen²,

Cocco³

et al. 1987

Space Sci Rev

375

216

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“…If we use h' (r) to represent the impulse reconstruction system the resulting image i(~) of the reconstruction of shadowgram a 2 s(-ar) is The decoding response of the then given by (2) The point response of the entire process (imaging and reconstruction), found when o(r) is a delta function, is For an extended source distribution o(r) the reconstructed image i(~) is (3) i (r)…”

Section: The Coded Shadow and Its Reconstructionmentioning

confidence: 99%

<title>Comparisons Of Coded Aperture Imaging Using Various Apertures And Decoding Methods</title>

Chang

Macdonald

Perez‐Mendez

1977

Applications of Optics in Medicine and Biology

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The utility of coded aperture imaging of radioisotope distributions in Nuclear Medicine is in its ability to give depth information about a three dimensional source.We have calculated imaging with Fresnel zone plate and multiple pinhole apertures to produce coded shadows and reconstruction of these shadows using correlation, Fresnel diffraction, and Fourier transform deconvolution. Comparisons of the coded apertures and decoding methods are made by evaluating their point r'esponse functions both for in-focus and out-of-focus image planes.Background averages and standard deviations were calculated. In some cases, background subtraction was made using combinations of two complementary apertures. Results using deconvolution reconstruction for finite numbers of events are also given.

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“…A coded aperture consisting of a number of random pinholes, with an average transmission of 50% was suggested by Dicke for X-ray astronomy [33]. Many other research projects have tried to improve the X-ray and gamma ray imaging systems over the years [34][35][36][37][38][39][40][41][42][43]. The CAI technique has also been adapted by Accorsi to near field geometry of medical imaging [44][45][46].…”

Section: Introductionmentioning

confidence: 99%

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

Schwarz

Shemer

Danan

et al. 2020

Sensors

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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.

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Coded Aperture Imaging of Gamma-Rays Using Multiple Pinhole Arrays and Multiwire Proportional Chamber Detector

Abstract: =; ti 1=153 arra^a vfclch ilTf^ii £s ri<-II. •"• »r vsj^la ia CSTJJS « •>.« cTh-r t= ij-trv-^rs^ whlti £-n i It«-fortiesi.-i-. = «•« s^cwr. is Fi.-. i.H. »«n-9t sid Z.Z, ZvZm'.c-. Li:: ii5"-t. ir5«-as 2 lTiir«-ise=.

Cited by 17 publications

References 7 publications

Coded aperture imaging in X- and gamma-ray astronomy

Coded aperture imaging in X- and gamma-ray astronomy

<title>Comparisons Of Coded Aperture Imaging Using Various Apertures And Decoding Methods</title>

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

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Coded Aperture Imaging of Gamma-Rays Using Multiple Pinhole Arrays and Multiwire Proportional Chamber Detector

Abstract: *=; ti* 1=15*3 arra^a vfclch ilTf*^ii £s ri<-II. •"• »*r* vsj^la ia CSTJJS « •>.« cTh-*r t*= ij-trv-^rs^ whlti £*-n i* It«-fortiesi.-i*-. = «•« s^cwr. is Fi.-. i.H. »«n-9t* sid Z.Z, ZvZm'.c-. Li:: ii5"-t. ir5«-as 2 lTiir«-ise=.

Cited by 17 publications

References 7 publications

Coded aperture imaging in X- and gamma-ray astronomy

Coded aperture imaging in X- and gamma-ray astronomy

<title>Comparisons Of Coded Aperture Imaging Using Various Apertures And Decoding Methods</title>

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

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Abstract: =; ti 1=153 arra^a vfclch ilTf^ii £s ri<-II. •"• »r vsj^la ia CSTJJS « •>.« cTh-r t= ij-trv-^rs^ whlti £-n i It«-fortiesi.-i-. = «•« s^cwr. is Fi.-. i.H. »«n-9t sid Z.Z, ZvZm'.c-. Li:: ii5"-t. ir5«-as 2 lTiir«-ise=.