Evaluating rotating slant-hole SPECT with respect to parallel hole SPECT

Bal, Girish; Clackdoyle, Rolf; Kadrmas, Dan; Zeng, G.L.; Christian, Paul E.

doi:10.1109/nssmic.2000.949383

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…In the 1980's, Change et al utilized a four segment RSH collimator for cardiac SPECT imaging and acquired simultaneously four projections from different views. The results showed an increased detection efficiency and also improved noise properties so that they suggested RSH collimator as a good alternative for cardiac imaging [14,33,43,60,61]. A multi-segment slant hole collimator has been introduced by dividing parallel hole collimator into multiple segments and then slanting the holes towards a Common Volume of View (CVOV) [14].…”

Section: Slant Hole Collimatorsmentioning

confidence: 99%

Review on Recent Developments in Collimators of Single Photon Emission Computed Tomography Imaging

Darkhor

Islamian

2020

fbt

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In Single Photon Emission Computed Tomography (SPECT), collimator selection, optimization, and also geometric calibration have a major impact on the acquired image quality and also on an accurate detectability and diagnosis. The collimator optimization phenomena consider some parameters such as field of view, resolution, sensitivity, resolution at depth, septal thickness and penetration for a specific application task. While the parallel hole collimator is usually used in SPECT and planar imaging but due to the limited solid angle covered by the collimator, the system sensitivity and resolution were highly reduced. Meanwhile, other types of collimators such as pin-hole, multi-pin-hole, slant and slit-slat collimators were introduced with a trade-off between sensitivity and resolution. This article reviews improvements on collimators also by considering the geometry and geometric calibration methods for improving the image quality in single photon emission computed tomography.

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Section: Slant Hole Collimatorsmentioning

confidence: 99%

Review on Recent Developments in Collimators of Single Photon Emission Computed Tomography Imaging

Darkhor

Islamian

2020

fbt

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“…The projection is the exponential Radon transform of the activity (1) where the coordinates (u, v) define the two-dimensional (2D) projection plane and J-L is the linear attenuation coefficient assumed to be known a priori and a constant throughout the object. The unit directional vectors in (1) are defined as: (2) where \7 is the gradient operator. For a ray passing through…”

Section: A Exponential Radon Transformmentioning

confidence: 99%

“…This leads to a sensitivity improvement 4 cos 3 (j times that of the conventional parallel-hole collimator with equivalent spatial resolution and acquisition time at a Early development and application of RMSSH SPECT is reviewed in [1]. Recent interest in RMSSH imaging has been shown in cardiac [2] and breast imaging [3], [4]. Reconstruction algorithms for RMSSH SPECT have also been developed [5]- [8] for the case in which a complete tomographic data set is acquired.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing uniformly attenuated rotating slant-hole SPECT projection data using the DBH method

Huang

Tsui

et al. 2008

2008 IEEE Nuclear Science Symposium Conference Record

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cost of the small detector field-of-view (FOV). Figure l( b) shows the cross-sectional view of the collimator. The two segments shown in the figure have a common volume-ofview (CVOV) indicated by the shaded volume. For a specific imaging task, the region-of-interest (ROI) should be located within the CVOV. The high sensitivity and small FOV of the RMSSH collimator ensure that it can be applied in dedicated SPECT systems for imaging small organs, such as breast, cardiac, and brain imaging. In this paper, an RMSSH SPECT system for breast imaging is investigated through a simulation study.Abstract-This work applies a previously developed analytical algorithm to the reconstruction in a rotating multi-segment slanthole (RMSSH) SPECT system. The RMSSH SPECT data of a digital NCAT phantom with breast attachment are modeled as the uniformly attenuated Radon transform of the activity distribution. These data are reconstructed using an analytical algorithm called the DBH method, which is an acronym for the procedure of differentiation and backprojection followed by a finite weighted Hilbert transform. The projection data are first differentiated along a specific direction and then backprojected to the image space. The result from the first step is equal to a one-dimensional finite weighted Hilbert transform of the object; this transform is then numerically inverted to obtain the reconstructed image. With the limited common volume-of-view (CVOV) of the RMSSH collimator, the detector captures gamma photon emissions from the breast and from parts of the torso. A conventional filtered backprojection algorithm only reconstructs the high frequency components of the activity function. The DBH method is capable of exactly reconstructing the activity within a well defined region-of-interest (ROI) within the breast. Quantitative accuracy is shown in this ROI from the simulation results. Quadrant slant-hole collimator (a) RMSSH collimator. a \ \ \ I / / (b) Side view.

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“…The SPECT system with an RMSSH collimator has been studied for some time (Edholm et al 1980, Holman et al 1981, Dale et al 1985, Wessell 1999, Bal et al 2000, 2006, Wagner et al 2001, 2002, Baird et al 2003, Liu et al 2004, Xu et al 2006, Xu and Tsui 2006). Early development and application of RMSSH SPECT is reviewed in the dissertation of Wessell (1999).…”

Section: Introductionmentioning

confidence: 99%

“…Early development and application of RMSSH SPECT is reviewed in the dissertation of Wessell (1999). Recent interest in RMSSH imaging has been shown in cardiac (Bal et al 2000(Bal et al , 2006 and breast imaging (Baird et al 2003, Liu et al 2004. Reconstruction algorithms for RMSSH SPECT have also been developed (Wagner et al 2001, 2002, Xu et al 2004 for the case in which a complete tomographic data set is acquired.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing uniformly attenuated rotating slant-hole SPECT projection data using the DBH method

Huang

Tsui

et al. 2009

Phys. Med. Biol.

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This work applies a previously developed analytical algorithm to the reconstruction problem in a rotating multi-segment slant-hole (RMSSH) SPECT system. The RMSSH collimator has greater detection efficiency than the parallel-hole collimator with comparable spatial resolution at the expense of limited common volume-of-view (CVOV) and is therefore suitable for detecting lowcontrast lesions in breast, cardiac and brain imaging. The absorption of gamma photons in both the human breast and brain can be assumed to follow an exponential rule with a constant attenuation coefficient. In this work, the RMSSH SPECT data of a digital NCAT phantom with breast attachment are modeled as the uniformly attenuated Radon transform of the activity distribution. These data are reconstructed using an analytical algorithm called the DBH method, which is an acronym for the procedure of differentiation backprojection followed by a finite weighted inverse Hilbert transform. The projection data are first differentiated along a specific direction in the projection space and then backprojected to the image space. The result from this first step is equal to a one-dimensional finite weighted Hilbert transform of the object; this transform is then numerically inverted to obtain the reconstructed image. With the limited CVOV of the RMSSH collimator, the detector captures gamma photon emissions from the breast and from parts of the torso. The simulation results show that the DBH method is capable of exactly reconstructing the activity within a well-defined region-of-interest (ROI) within the breast if the activity is confined to the breast or if the activity outside the CVOV is uniformly attenuated for each measured projection, while a conventional filtered backprojection algorithm only reconstructs the high frequency components of the activity function in the same geometry.

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Evaluating rotating slant-hole SPECT with respect to parallel hole SPECT

Cited by 6 publications

References 7 publications

Review on Recent Developments in Collimators of Single Photon Emission Computed Tomography Imaging

Review on Recent Developments in Collimators of Single Photon Emission Computed Tomography Imaging

Reconstructing uniformly attenuated rotating slant-hole SPECT projection data using the DBH method

Reconstructing uniformly attenuated rotating slant-hole SPECT projection data using the DBH method

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