An accelerated Algebraic Reconstruction Technique based on the Newton-Raphson scheme

Angeli, Stelios; Stiliaris, E.

doi:10.1109/nssmic.2009.5401763

Cited by 18 publications

(13 citation statements)

References 6 publications

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“…The reconstruction procedure is performed with iterative algorithms and with software developed in our laboratory. For comparison reasons two diAEerent techniques are used: The Maximum Likelihood Expectation-Maximization (MLEM) technique and an accelerated variation [3] of the Algebraic Reconstruction Technique (ART). Finally, all 21 tomograms produced by the reconstruction procedure along the Z-axis are synthesized to a 3D tomographic image using MATLAB software (Figure 3).…”

Section: Methodsmentioning

confidence: 99%

Sensitivity and Resolution Study of a Small-Field γ-Camera System on a Tomographic Level

Rapsomanikis¹,

Zioga²,

Mikeli³

et al. 2020

hnps

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The sensitivity and the spatial resolution of a small-field ∞-Camera system based on a Position Sensitive Photomultiplier Tube (PSPMT) on a tomographic level are examined in this study. A cylindrical Gel-Phantom (d = 40 mm, h = 50 mm) with cylindro-conoidal tubes and capillaries (from 64 to 640 mm 3 in volume) containing water solution of 99m T c is used as a test phantom in the present work. A total of 24 projections covering the full angle region (0 0°3 60 0 ) are obtained with the ∞-Camera system under examination. The planar information is further analyzed to reconstruct the tomographic images taking into account all oAE-line corrections needed to remove barreloid deformations appearing at the edges of the Field-of-View. The reconstruction procedure is performed with iterative algorithms and for comparison reasons two diAEerent techniques (MLEM and accelerated ART) are used. The variety of the 99m T c-volumes in the phantom with the given specific radioactivity and the phantom axial asymmetry, due to the diAEerent radial distances of the tubes in the gel environment, allow a realistic characterization of the system's performance on a tomographic level. Obtained experimental results for the system sensitivity and spatial resolution are presented and discussed in this work.

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Section: Methodsmentioning

confidence: 99%

Sensitivity and Resolution Study of a Small-Field γ-Camera System on a Tomographic Level

Rapsomanikis¹,

Zioga²,

Mikeli³

et al. 2020

hnps

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“…All the equivalent slices were reconstructed, forming 2-D tomographic images by using, for comparison reasons, two different techniques: the SPECT Lab's custom made, accelerated variation [2] of the Algebraic Reconstruction Technique (ART) and the Maximum Likelihood Expectation-Maximization (MLEM) technique ( Figure 4). …”

Section: Planar Information and Reconstructionmentioning

confidence: 99%

“…A typical comparison at a planar level and for 8=30° is shown in Figure 7. The information from the simulating process was used to form a 3-D reconstructed image of the gel-phantom, using both reconstruction algorithms: The Lab's custom made, accelerated variation [2] of the Algebraic Reconstruction Technique (ART) and the Maximum Likelihood Expectation Maximization (MLEM) technique. In the fIrst case the isosurface constant was equal to 0.08 and in the second equal to 0.06.…”

Section: Gate Simulationmentioning

confidence: 99%

Sensitivity and resolution study of a small-field γ-Camera system on a tomographic level

Mikeli

Rapsomanikis

Thanasas

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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The sensitivity and the spatial resolution of a small field y-Camera system based on a Position Sensitive PhotoMultiplier Tube (PSPMT) on a tomographic level are examined in this study. A cylindrical Gel-Phantom (d=40 mm, h=50mm) with cylindro-conoidal tubes and capillaries (from 64 to 640 mm3) containing water solution of 99mTc is used as a test phantom in the present work. A total of 24 projections covering the full angle region (0°_360°) are obtained with the y-Camera system under examination. The planar information is further analyzed to reconstruct the tomographic images taking into account all off-line corrections needed to remove barreloid deformations appearing at the edges of the field-of-view. The reconstruction procedure is performed with iterative algorithms and for comparison reasons two different techniques (MLEM and accelerated ART) are used. The variety of the 99mTc_volu mes in the phantom with the given specific radioactivity and the phantom axial asymmetry, due to the different radial distances of the tubes in the gel environment, allow a realistic characterization of the system's performance on a tomographic level. Obtained experimental results for the system sensitivity and spatial resolution are presented and discussed in this work;they are also directly compared with ideal tomographic results acquired from the fully simulated y-Camera system through GATE.

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“…In the past years, in our laboratory a prototype small field ,-Camera system based on the R2486 (HAMAMATSU) Position Sensitive PhotoMultiplier Tube has been developed [1], [2], [3].…”

Section: Sys Tem Descriptionmentioning

confidence: 99%

A real time motion correction technique for a small-field γ-Camera system

Zioga

Mikeli

Rapsomanikis

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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A small-field portable 'Y -Camera system based on a Position Sensitive Photomultiplier Tu be (PSPMT) has been recently developed in our Lab. This prototype is to be engaged to clinical applications for planar imaging of 99 Tc-radiotracers during breast cancer operations. Among the basic requirements during data-taking operation is the absence of any distorting motion which can drastically affect the quality of the image. In the present work, a simple and low cost solution to overcome this stability problem by means of commercially available equipment is proposed. It is based on the Nintendo's Wii Remote sensors, a small handheld device which can be easily coupled to the portable camera. It comprises both, a 3D-accelerometer and an infrared-sensor and operates with modern communication protocols (Bluetooth). Based on the received accelerometer and infrared-sensor data, a procedure has been further developed which calculates any real time movement of the system. The 'Y Camera's DAQ system, realized on the LabVIEW environment, is capable to store all these primary parameters on a event-by event basis and to perform the necessary motion correction in real time. Some typical image correction results are presented in the current work.

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An accelerated Algebraic Reconstruction Technique based on the Newton-Raphson scheme

Cited by 18 publications

References 6 publications

Sensitivity and Resolution Study of a Small-Field γ-Camera System on a Tomographic Level

Sensitivity and Resolution Study of a Small-Field γ-Camera System on a Tomographic Level

Sensitivity and resolution study of a small-field γ-Camera system on a tomographic level

A real time motion correction technique for a small-field γ-Camera system

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An accelerated Algebraic Reconstruction Technique based on the Newton-Raphson scheme

Cited by 18 publications

References 6 publications

Sensitivity and Resolution Study of a Small-Field γ-Camera System on a Tomographic Level

Sensitivity and Resolution Study of a Small-Field γ-Camera System on a Tomographic Level

Sensitivity and resolution study of a small-field &#x03B3;-Camera system on a tomographic level

A real time motion correction technique for a small-field &#x03B3;-Camera system

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Sensitivity and resolution study of a small-field γ-Camera system on a tomographic level

A real time motion correction technique for a small-field γ-Camera system