Polychromatic CT Data Improvement with One-Parameter Power Correction

Standard approaches to tomography reconstruction of the projection data registered with polychromatic emission lead to the appearance of cupping artifacts and irrelevant lines between regions of strong absorption. The main reason for their appearance is the fact that part of the emission with low en...

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Bibliographic Details
Published in:Mathematical problems in engineering 2019-01, Vol.2019 (2019), p.1-12
Main Authors: Ingacheva, Anastasia S., Chukalina, Marina V.
Format: Article
Language:English
Subjects:
Absorption
Algebra
Algorithms
Calibration
Drug dosages
Emission
Energy
Flow charts
Health physics
Image reconstruction
Iterative methods
Laboratories
Mathematical problems
Medical imaging
Methods
Optimization
Parameters
Physics
Projection
X-rays
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Summary:Standard approaches to tomography reconstruction of the projection data registered with polychromatic emission lead to the appearance of cupping artifacts and irrelevant lines between regions of strong absorption. The main reason for their appearance is the fact that part of the emission with low energy is being absorbed entirely by high absorbing objects. This fact is known as beam hardening (BH). The procedure of processing projection data collected in polychromatic mode is presented; it reduces artifacts relevant to BH and does not require additional calibration experiments. The procedure consists of two steps: the first is to linearize the projection data with one-parameter power correction, and the second is to reconstruct the images from linearized data. Automatic parameter adjustment is the main advantage of the procedure. The optimization problem is formulated. The system flowchart is presented. The reconstruction with different powers of correction is considered to evaluate the quality reconstruction.
ISSN:1024-123X
1563-5147
DOI:10.1155/2019/1405365