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Updated: Jun 23, 2026
07:51
Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
Published on: August 27, 2019
Exact emission SPECT reconstruction with truncated transmission data.
Gengsheng L Zeng1, Grant T Gullberg
1Utah Center for Advanced Imaging, Department of Radiology, University of Utah, Salt Lake City, UT 84108, USA. larry@ucair.med.utah.edu
Physics in Medicine and Biology
|May 12, 2009
Summary
This study introduces a new method for accurate attenuation correction in SPECT/CT imaging, even with truncated transmission data. The technique reconstructs an exact attenuation map within a defined object support, improving image quality.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Image Reconstruction
Background:
- Truncated transmission data is a common issue in SPECT/CT systems, hindering accurate attenuation correction.
- Accurate attenuation maps are crucial for quantitative SPECT imaging.
Purpose of the Study:
- To develop a method for exact attenuation correction using truncated transmission data in SPECT.
- To reconstruct an accurate attenuation map within a defined object support.
Main Methods:
- A novel emission data reconstruction technique combining conjugate view emission projections.
- A modified Maximum Likelihood Expectation-Maximization (ML-EM) algorithm for emission data reconstruction.
- Reconstruction of the attenuation map within the support using transmission measurements and identification of soft tissue regions.
Main Results:
- The method successfully reconstructs an exact attenuation map within the object's support.
- Computer simulations confirm the accuracy of the developed method.
- The algorithm's convergence is mathematically proven.
Conclusions:
- An exact attenuation map can be obtained within the support if the attenuation coefficient is known for at least one pixel.
- This method enables attenuation correction in SPECT imaging despite truncated transmission data, requiring 360-degree emission data.
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