Related Experiment Video
Updated: May 1, 2026
06:28
Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
12.3K
Impact of relative head sensitivity differences in multi-head gamma cameras
Megan C Horsfield1, Aravind S Ravi Kumar, Bruce J Wallace
1Department of Nuclear Medicine, Royal Brisbane and Women's Hospital PO, Herston, QLD, 4029, Australia, megan.horsfield@sesiahs.health.nsw.gov.au.
Australasian Physical & Engineering Sciences in Medicine
|April 18, 2014
Summary
Cerebral perfusion SPECT imaging can reveal brain abnormalities. This study identified an artifact in CT-corrected images, causing apparent hyperperfusion, which was traced to camera sensitivity differences.
Area of Science:
- Nuclear Medicine
- Medical Imaging
- Neurology
Background:
- Cerebral perfusion single-photon emission computed tomography (SPECT) is utilized for identifying epileptogenic foci.
- Attenuation correction is crucial for accurate SPECT image interpretation.
Purpose of the Study:
- To investigate a clinically significant artifact observed in cerebral SPECT imaging.
- To determine the cause and characteristics of this artifact in different attenuation correction methods.
Main Methods:
- Comparison of (99m)Tc ethyl cysteinate dimer SPECT brain images using CT attenuation correction versus Chang attenuation correction.
- Review of archived SPECT studies.
- Phantom investigations to replicate and analyze the artifact.
Main Results:
- CT attenuation correction revealed apparent diffuse hyperperfusion in the right hemisphere, unlike symmetrical perfusion in Chang-corrected images.
- The artifact was consistently observed in previous SPECT studies from the same camera.
- Phantom studies identified camera relative head sensitivity as the artifact's cause.
Conclusions:
- A significant artifact can occur with CT attenuation correction in cerebral SPECT, mimicking hyperperfusion.
- Understanding this artifact is essential for accurate interpretation of SPECT brain perfusion studies.
- Camera-specific calibration and phantom investigations are vital for quality control in SPECT imaging.
