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Related Concept Videos

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...
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...
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...
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...

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Related Experiment Video

Updated: Jul 1, 2026

Construction of a Preclinical Multimodality Phantom Using Tissue-mimicking Materials for Quality Assurance in Tumor Size Measurement
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Construction of a Preclinical Multimodality Phantom Using Tissue-mimicking Materials for Quality Assurance in Tumor Size Measurement

Published on: July 29, 2013

Parallel imaging enhanced MR colonography using a phantom model.

Martina M Morrin1, Ivan Pedrosa, Charles A McKenzie

  • 1Department of Radiology, Beaumont Hospital, Dublin, Ireland. mmorrin@rcsi.ie

Journal of Magnetic Resonance Imaging : JMRI
|September 9, 2008
PubMed
Summary
This summary is machine-generated.

Array Spatial and Sensitivity Encoding Technique (ASSET)-enhanced sequences improve colon polyp detection in MR colonography (MRC). These faster imaging techniques allow for increased spatial resolution, aiding in the identification of significant polyps.

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Published on: April 18, 2015

Area of Science:

  • Medical Imaging
  • Radiology
  • Gastroenterology

Background:

  • Magnetic Resonance (MR) colonography (MRC) faces limitations in polyp detection due to long breath-hold times and low spatial resolution with standard 3D SPGR T1W imaging.
  • Parallel imaging techniques, such as Array Spatial and Sensitivity Encoding Technique (ASSET), offer potential solutions by reducing acquisition times.

Purpose of the Study:

  • To compare ASSET-enhanced T2W SSFSE and T1W 3D SPGR sequences against standard sequences for polyp detection and image quality in a phantom model.
  • To evaluate the impact of ASSET acceleration on spatial resolution and imaging time in MR colonography.

Main Methods:

  • Two porcine colon phantoms with simulated polyps were imaged using baseline sequences without ASSET and multiple ASSET-enhanced SSFSE and SPGR sequences with varying bandwidth, matrix size, and slice thickness.
  • ASSET acceleration of 2-fold was applied, with slice thickness adjusted to maintain short acquisition times (23-26 seconds).
  • Two experienced radiologists assessed polyp detection and image quality in a blinded, randomized manner.

Main Results:

  • ASSET-enhanced SSFSE and SPGR sequences demonstrated improved polyp detection compared to reference sequences.
  • Overall image quality and per-phantom specificity were similar between ASSET-enhanced and reference sequences.
  • Specific ASSET-enhanced SSFSE and SPGR parameters allowed for the detection of all polyps measuring 5 mm or larger.

Conclusions:

  • Parallel imaging with ASSET-enhanced T2W SSFSE and T1W 3D SPGR significantly improves the detection of clinically relevant colon polyps in a phantom model.
  • These advanced imaging techniques hold promise for enhancing the diagnostic performance of MR colonography.