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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Related Experiment Video

Updated: May 26, 2025

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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[A Simple Method for Measuring the Anisotropic Two-dimensional Noise Power Spectrum in Helical CT Scan].

Yuki Ohsugi1, Akihiro Narita2, Masaki Ohkubo2

  • 1Department of Radiology, Division of Medical Technology, Niigata University Medical and Dental Hospital.

Nihon Hoshasen Gijutsu Gakkai Zasshi
|February 24, 2025
PubMed
Summary

A new method simplifies measuring anisotropic 2-dimensional noise power spectrum (2D-NPS) in computed tomography. This technique, using fewer scans, accurately captures the 2D-NPS rotation with X-ray tube angle.

Keywords:
X-ray tube angleanisotropic noise power spectrumcomputed tomographyhelical computed tomography scannoise power spectrum

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Area of Science:

  • Medical Imaging
  • Image Quality Assessment
  • Computed Tomography

Context:

  • Anisotropic 2-dimensional noise power spectrum (2D-NPS) is crucial for computed tomography (CT) image quality.
  • Traditional methods to measure 2D-NPS at various X-ray tube angles (2D-NPSθ) are laborious, requiring numerous scans.

Purpose:

  • To propose a novel, simplified method for measuring the anisotropic 2D-NPS in CT.
  • To define and validate a rotated 2D-NPS (2D-NPSrot) that represents the spectrum across different X-ray tube angles with fewer acquisitions.

Summary:

  • The study introduces a method assuming the anisotropic 2D-NPS rotates with the X-ray tube angle.
  • This 2D-NPSrot is measured using only two scans and rotating the data in the spatial frequency domain.
  • The proposed 2D-NPSrot closely matches the conventional 2D-NPSθ, with minimal mean percentage error (<0.70%).

Impact:

  • Enables simpler and more efficient measurement of anisotropic 2D-NPS in CT.
  • Facilitates improved image quality assessment and optimization in helical CT scans.
  • Reduces the time and resources needed for CT noise characterization.