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- Gengsheng Lawrence Zeng, Grant T. Gullberg
- IEEE Transactions on Medical Imaging
- 2000

Computational burden is a major concern when an iterative algorithm is used to reconstruct a three-dimensional (3-D) image with attenuation, detector response, and scatter corrections. Most of theâ€¦ (More)

- Jiangsheng You, Gengsheng Lawrence Zeng
- IEEE Transactions on Medical Imaging
- 2007

This paper presents a new type of filtered backprojection (FBP) algorithm for fan-beam full- and partial-scans. The filtering is shift-invariant with respect to the angular variable. Theâ€¦ (More)

- Gengsheng Lawrence Zeng, Nisar Ahmed
- IEEE Trans. Acoustics, Speech, and Signalâ€¦
- 1989

This correspondence introduces an efficient method for encoding sparse binary patterns. This method is very simple to implement and performs in a near optimum way. Manuscript received April 2 , 1988;â€¦ (More)

- Gengsheng Lawrence Zeng, Grant T. Gullberg
- IEEE Trans. Med. Imaging
- 1994

Fan-beam collimators are used in single photon emission computed tomography to improve the sensitivity for imaging of small organs. The disadvantage of fan-beam collimation is the truncation ofâ€¦ (More)

- Grant T. Gullberg, Gengsheng Lawrence Zeng
- IEEE Trans. Med. Imaging
- 1992

A filtered backprojection reconstruction algorithm was developed for cardiac single photon emission computed tomography with cone-beam geometry. The algorithm reconstructs cone-beam projectionsâ€¦ (More)

- Roman Basko, Gengsheng Lawrence Zeng, Grant T. Gullberg
- Physics in medicine and biology
- 1998

The Compton camera can collect SPECT data with high efficiency due to electronic collimation. The data acquired from a Compton camera are projections of source activity along cones and areâ€¦ (More)

- Cliuanyong Bai, Gengsheng Lawrence Zeng, G T Gullberg
- Physics in medicine and biology
- 2000

Converging collimation increases the geometric efficiency for imaging small organs, such as the heart, but also increases the difficulty of correcting for the physical effects of attenuation,â€¦ (More)

- Gengsheng Lawrence Zeng
- Medical physics
- 2007

An exact analytical image reconstruction method is presented for two-dimensional imaging. The method performs backprojection, the derivative and finite Hilbert transforms. This method can be appliedâ€¦ (More)

- Gengsheng Lawrence Zeng, Daniel Gagnon, Frank Natterer, Wenli Wang, Marc Wrinkler, William Hawkins
- 2001

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.â€¦ (More)

- Dosik Hwang, Gengsheng Lawrence Zeng
- Medical physics
- 2005

This paper proposes a new iterative reconstruction algorithm for transmission tomography and compares this algorithm with several other methods. The new algorithm is simple and resembles the emissionâ€¦ (More)