#### Filter Results:

- Full text PDF available (12)

#### Publication Year

1997

2015

- This year (0)
- Last 5 years (3)
- Last 10 years (5)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- Bruno De Man, Samit Basu
- Physics in medicine and biology
- 2004

Projection and backprojection are operations that arise frequently in tomographic imaging. Recently, we proposed a new method for projection and backprojection, which we call distance-driven, and that offers low arithmetic cost and a highly sequential memory access pattern. Furthermore, distance-driven projection and backprojection avoid several… (More)

- Samit Basu, Yoram Bresler
- IEEE Trans. Image Processing
- 2000

We present a new fast reconstruction algorithm for parallel beam tomography. The new algorithm is an accelerated version of the standard filtered backprojection (FBP) reconstruction, and uses a hierarchical decomposition of the backprojection operation to reduce the computational cost from O(N(3)) to O(N(2)log(2 )N). We discuss the choice of the various… (More)

- Rajiv Gupta, Sönke Bartling, +5 authors H D Curtin
- AJNR. American journal of neuroradiology
- 2004

BACKGROUND AND PURPOSE
A CT scanner employing a digital flat-panel detector is capable of very high spatial resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone.
METHODS
Four partially… (More)

- Samit Basu, Yoram Bresler
- IEEE Trans. Information Theory
- 2000

We present a global Ziv-Zakai-type lower bound on the mean square error for estimation of signal parameter vectors, where some components of the distortion function may be periodic. Periodic distortion functions arise naturally in the context of direction of arrival or phase estimation problems. The bound is applied to an image registration problem, and… (More)

- Samit Basu, Yoram Bresler
- ICIP
- 1998

In the standard two-dimensional (2-D) parallel beam tomographic formulation, it is generally assumed that the angles at which the projections were acquired are known. We have previously demonstrated, however, that under fairly mild conditions these view angles can be uniquely recovered from the projections themselves. We address the question of reliability… (More)

- Alexander Katsevich, Samit Basu, Jiang Hsieh
- Physics in medicine and biology
- 2004

We present an exact filtered backprojection reconstruction formula for helical cone beam computed tomography in which the pitch of the helix varies with time. We prove that the resulting algorithm, which is functionally identical to the constant pitch case, provides exact reconstruction provided that the projection of the helix onto the detector forms… (More)

- Samit Basu, Yoram Bresler
- IEEE Trans. Signal Processing
- 2000

A number of problems of interest in signal processing can be reduced to nonlinear parameter estimation problems. The traditional approach to studying the stability of these estimation problems is to demonstrate finiteness of the Cramér–Rao bound (CRB) for a given noise distribution. We review an alternate, determinstic notion of stability for the associated… (More)

- Samit Basu, Yoram Bresler
- IEEE Trans. Image Processing
- 2000

In the standard two-dimensional (2-D) parallel beam tomographic formulation, it is assumed that the angles at which the projections were acquired are known. In certain situations, however, these angles are known only approximately (as in the case of magnetic resonance imaging (MRI) of a moving patient), or are completely unknown. The latter occurs in a… (More)

We propose a fast algorithm for far-field SAR imaging based on a new fast back-projection algorithm developed for tomography. We also modify the algorithm for the near-field scenario. The fast back-projection algorithm for SAR has computational complexity . Compared to traditional FFT-based methods, our new algorithm has potential advantages: the new… (More)

- Samit Basu, Yoram Bresler
- IEEE Trans. Med. Imaging
- 2002

We present a novel backprojection algorithm for three-dimensional (3-D) radon transform data that requires O(N3 log2 N) operations for reconstruction of an N x N x N volume from O(N2) plane-integral projections. Our algorithm uses a hierarchical decomposition of the 3-D radon transform to recursively decompose the backprojection operation. Simulations are… (More)