Three-dimensional radiographic imaging with a restricted view angle

Chiu, M. Y.; Barrett, Harrison H.; Simpson, R. G.; Chou, Chien; Arendt, J.; Gindi, Gene

doi:10.1364/josa.69.001323

Cited by 68 publications

(17 citation statements)

References 9 publications

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“…4. This "missing cone" problem has been investigated in a variety of different 3-D imaging systems with limited view angles [2], [15]- [17]. If frequency components within the missing cone and especially along the axis are assumed to be zero, the reconstructed mean densities of all planes perpendicular to will be equal.…”

Section: Discussionmentioning

confidence: 99%

Parallel-beam tilted-head analytic SPECT reconstruction: derivation and comparison with OSEM

Pieper

Bowsher²,

Tornai³

et al. 2002

IEEE Trans. Nucl. Sci.

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Parallel-beam tilted-head single photon emission computed tomography (TH-SPECT) was previously implemented on a SPECT system for its potential to image breast lesions and nearby axilla of seated, upright women. All TH-SPECT reconstructions will contain artifacts since the tilted orbit does not satisfy the Orlov sampling criteria. However, it is not clear which reconstruction method, if any, is better suited for TH-SPECT data. Here a geometric derivation of the ramp filter for tilted parallel-beam geometries is presented. A filtered backprojection (FBP) algorithm, using this filter, was then implemented and compared with an iterative ordered subsets expectation maximization (OSEM) algorithm, using TH-SPECT data. A breast scan at various tilt angles was simulated and used to generate a noise versus bias study for both methods. Contrast and signal-to-noise ratio (SNR) values, as well as axial elongation present in all TH-SPECT reconstructions, were characterized using a mini-Defrise disk phantom placed inside a fillable breast phantom and imaged from 0 to 15 head tilt. A fillable breast phantom containing lesions was also imaged with a system dedicated to prone breast SPECT from 0 to 30 to evaluate the effects of incomplete sampling due to greater tilt angles. FBP noise versus bias studies indicated a greater increase in bias with tilt angle compared to OSEM reconstructions. At small tilt angles about the mini-Defrise disk phantom, poorer contrasts were obtained with FBP compared to OSEM at similar noise levels. All reconstructions of the fillable breast phantom indicated axial elongation at greater tilt angles, although FBP reconstructions displayed an increase in stretching distortions of the breast. OSEM SNR and contrast values were higher at all degrees of tilt. In conclusion, measured results indicate OSEM TH-SPECT reconstruction provides better contrast and SNR values and may offer better shape and uniform activity distribution of the breast compared to FBP methods.Index Terms-Breast imaging, filtered backprojection (FBP), ordered subsets expectation maximization (OSEM), Orlov, single photon emission computed tomography (SPECT).

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Section: Discussionmentioning

confidence: 99%

Parallel-beam tilted-head analytic SPECT reconstruction: derivation and comparison with OSEM

Pieper

Bowsher²,

Tornai³

et al. 2002

IEEE Trans. Nucl. Sci.

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“…In fact, there are strong restrictions that are imposed by the wave nature of light and by the finite aperture of any practical imaging system [3,6] . There are certain spatial frequencies that are not transmitted by the system, which leads to à missing cones problem' (similar to that arising in computed tomography [7]) . These restrictions are important not only for 3-D data acquisition ; we encounter the same problems if we wish to synthesize a 3-D intensity distribution (for example in a 3-D display, in material processing or in scanning applications) using the 3-D PSF …”

Section: Introductionmentioning

confidence: 99%

Depth Transfer by an Imaging System

Streibl¹

1984

Optica Acta: International Journal of Optics

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“…Compared with CT with full projection data, the observation angular range in the proposed microscopic tomography is limited by the aperture of the objective lens, and hence the 3-D transfer function of this system is angularly bandlimited. The same problem is found in X-ray tomography including motion tomography (3,14), CT (10,12), and emission CT (20). The 3-D imaging by a 1(a) microscope has also the same problem for reconstruction (19) ; 3-D OTF is angularly bounded by the aperture of the objective lens.…”

Section: Reconstructionmentioning

confidence: 78%