Performance evaluation of a new CZT detector for nuclear medicine: Soltice

Griesmer, Jerome; Kline, Ben; Grosholz, J.; Parnham, K.; Gagnon, Daniel

doi:10.1109/nssmic.2001.1009733

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…The total number of events which are emitted isotropically from a 57 Co and an 111 In radioactive source, are 100 million and 10 million respectively. The FWHM of the Gaussian probability distribution is assumed as 4% for CZT and 10% for NaI at 122 keV [8] here to sample the energy to get the energy spectra.…”

Section: Resultsmentioning

confidence: 99%

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Design studies of a CZT-based detector combined with a pixel-geometry-matching collimator for SPECT imaging

Weng

Bagchi

Huang

et al. 2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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Single Photon Emission Computed Tomography (SPECT) suffers limited efficiency due to the need for collimators. Collimator properties largely decide the data statistics and image quality. Various materials and configurations of collimators have been investigated in many years. The main thrust of our study is to evaluate the design of pixel-geometry-matching collimators to investigate their potential performances using Geant4 Monte Carlo simulations. Here, a pixel-geometry-matching collimator is defined as a collimator which is divided into the same number of pixels as the detector’s and the center of each pixel in the collimator is a one-to-one correspondence to that in the detector. The detector is made of Cadmium Zinc Telluride (CZT), which is one of the most promising materials for applications to detect hard X-rays and γ-rays due to its ability to obtain good energy resolution and high light output at room temperature. For our current project, we have designed a large-area, CZT-based gamma camera (20.192 cm×20.192 cm) with a small pixel pitch (1.60 mm). The detector is pixelated and hence the intrinsic resolution can be as small as the size of the pixel. Materials of collimator, collimator hole geometry, detection efficiency, and spatial resolution of the CZT detector combined with the pixel-matching collimator were calculated and analyzed under different conditions. From the simulation studies, we found that such a camera using rectangular holes has promising imaging characteristics in terms of spatial resolution, detection efficiency, and energy resolution.

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Section: Resultsmentioning

confidence: 99%

“…The FWHM, defined as the energy resolution and equal to the minimum difference of energy between particles or photons which is just sufficient to differentiate energy levels, is a useful measure of the detector. Usually, the energy resolution of NaI crystals is much worse than CZT semiconductor [7][8]. …”

Section: Methodsmentioning

confidence: 99%

Design studies of a CZT-based detector combined with a pixel-geometry-matching collimator for SPECT imaging

Weng

Bagchi

Huang

et al. 2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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“…As a special case, if the operator is the Radon transform, then is an identity matrix, thus is local. The next example is the weighted planar measurements from our recently developed CdZnTe strip detector with a parallel slat collimator [15], [16]. Fig.…”

Section: Examples Ofmentioning

confidence: 99%

Local tomography property of residual minimization reconstruction with planar integral data

Zeng

Gagnon

Natterer

et al. 2003

IEEE Trans. Nucl. Sci.

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Residual minimization with the well-known conjugate gradient (CG) algorithm has been applied to medical image reconstruction for years. The main advantage of this method is its fast convergence rate. In this paper, we point out that this method has another property-local tomography, when this image reconstruction method is applied to planar integral projections. By local tomography we mean the following: The object is relatively large, the entire object is not sufficiently measured, and the projections are truncated due to a small detector size. However, a small region-of-interest (ROI) is sufficiently measured. The small ROI is able to be exactly reconstructed. This local tomographic property is found for planar integral data only and is not found for line-integral measurements. Iterative local tomography has been applied to cos weighted planar integral data through computer simulations and phantom experiments. An efficient projector that models the cos weighting factor is also developed.

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“…A strip-shaped SPECT (single photon emission computed tomography) gamma camera has been developed using CdZnTe detectors. 1,2 Since the cost of the detector is proportional to the detector area, the strip-shape (i.e., a narrow and long rectangular shape) detector was chosen to provide a large field-of-view imaging region with a relatively small detector surface area.…”

Section: Introductionmentioning

confidence: 99%

Image reconstruction algorithm for a spinning strip CZT SPECT camera with a parallel slat collimator and small pixels

Zeng

Gagnon

2004

Medical Physics

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This paper discusses the use of small pixels in a spinning CdZnTe single photon emission computed tomography (SPECT) camera that is mounted with a parallel slat collimator. In a conventional slat collimation configuration, there is a detector pixel between two adjacent collimator slats. In our design, the pixel size is halved. That is, there are two smaller pixels to replace a regular pixel between two adjacent slats while the collimator remains unchanged. It has an advantage over our older design that uses tilted slats. In order to acquire a complete data set the tilted-slat collimator must spin 360 degrees at each SPECT view while the proposed design requires only 180 degrees at each SPECT view. Computer simulations and phantom experiments have been carried out to investigate the performance of the small-pixel configuration. It is observed that this design has the potential to increase the spatial resolution of the detector while keeping photon counts the same.

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Performance evaluation of a new CZT detector for nuclear medicine: Soltice

Cited by 16 publications

References 4 publications

Design studies of a CZT-based detector combined with a pixel-geometry-matching collimator for SPECT imaging

Design studies of a CZT-based detector combined with a pixel-geometry-matching collimator for SPECT imaging

Local tomography property of residual minimization reconstruction with planar integral data

Image reconstruction algorithm for a spinning strip CZT SPECT camera with a parallel slat collimator and small pixels

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