Related Experiment Video
Updated: Apr 17, 2026
02:09
Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function
Published on: April 12, 2024
1.2K
Iterative reconstruction for quantitative computed tomography analysis of emphysema: consistent results using
Tsuneo Yamashiro1, Tetsuhiro Miyara1, Osamu Honda2
1Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Nishihara, Okinawa, Japan.
International Journal of Chronic Obstructive Pulmonary Disease
|February 25, 2015
Summary
Iterative reconstruction (AIDR3D) improves the consistency of pulmonary emphysema measurements on CT scans across varying radiation doses. This technique enhances quantitative CT analysis by reducing variability associated with different tube currents.
Area of Science:
- Radiology
- Pulmonary Medicine
- Medical Imaging
Background:
- Pulmonary emphysema assessment relies on quantitative computed tomography (CT).
- Image reconstruction methods can influence quantitative analysis accuracy.
- Iterative reconstruction techniques offer potential improvements in image quality and consistency.
Purpose of the Study:
- To evaluate the benefits of Adaptive Iterative Dose Reduction using Three Dimensional Processing (AIDR3D) for quantitative CT analysis of pulmonary emphysema.
- To compare the consistency of emphysema measurements using AIDR3D versus conventional filtered-back projection.
Main Methods:
- Chest CT scans were acquired from 22 emphysema patients at three tube currents (240, 120, 60 mA).
- Scan data were reconstructed using AIDR3D and filtered-back projection.
- Quantitative metrics, including LAA% and 15th percentile lung density, were measured.
- Statistical analyses compared results between reconstruction methods and correlated measurement errors with body weight.
Main Results:
- Scans reconstructed with AIDR3D showed significantly higher LAA% and lower 15th percentile values compared to filtered-back projection across all tube currents (P<0.0001).
- Without AIDR3D, lower tube currents led to higher LAA% and lower 15th percentile values, with significant differences between tube currents.
- With AIDR3D, emphysema extent measurements were consistent across different tube currents.
- Measurement errors were significantly correlated with body weight for filtered-back projection but minimally for AIDR3D.
Conclusions:
- Adaptive Iterative Dose Reduction using Three Dimensional Processing (AIDR3D) enhances the consistency of quantitative emphysema assessment in CT.
- AIDR3D reduces variability in measurements across different radiation dose levels, improving reliability for clinical use.
- Iterative reconstruction is advantageous for quantitative CT analysis of pulmonary emphysema compared to conventional methods.
Related Concept Videos
01:10Computed Tomography
9.7K
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...
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...
9.7K
01:07Electron Microscope Tomography and Single-particle Reconstruction
3.1K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
3.1K
01:27Imaging Studies III: Computed Tomography
799
DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
799