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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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...

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Comparison of advanced iterative reconstruction methods for SPECT/CT.

Peter Knoll1, Daniela Kotalova, Gunnar Köchle

  • 1Department of Nuclear Medicine and PET Center, Wilhelminenspital, Vienna, Austria.

Zeitschrift Fur Medizinische Physik
|July 5, 2011
PubMed
Summary
This summary is machine-generated.

New SPECT/CT reconstruction software significantly improves image resolution and contrast. Optimal performance is achieved without post-filtering, though users must balance resolution gains against noise reduction for specific imaging needs.

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging
  • Radiology

Background:

  • Commercially available corrective image reconstruction methods offer improved spatial resolution and reduced noise.
  • These advanced methods aim to enhance diagnostic accuracy in SPECT/CT imaging.

Purpose of the Study:

  • To evaluate the performance of three new SPECT/CT image reconstruction software packages.
  • To compare their effectiveness against standard ordered subset expectation maximization (OSEM) reconstruction.

Main Methods:

  • Three SPECT/CT systems (GE, Philips, Siemens) were used with resolution and NEMA phantoms.
  • Projection data were reconstructed using vendor-recommended settings for GE's Evolution for Bone, Philips Astonish, and Siemens Flash3D.
  • Results were compared to reference OSEM reconstructions.

Main Results:

  • Advanced reconstruction without post-filtering yielded the best resolution and contrast across all systems.
  • Full Width at Half Maximum (FWHM) improved significantly, e.g., Philips: 9.1mm to 6.4mm.
  • Image quality indices improved substantially, but post-filtering reduced spatial resolution while decreasing background variability.

Conclusions:

  • Advanced reconstruction algorithms significantly enhance SPECT/CT image resolution and contrast, particularly when scatter correction is applied without post-filtering.
  • Users must weigh the benefits of noise reduction via post-filtering against the improved spatial resolution offered by these new methods for optimal clinical application.