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Nonuniformity intrinsic flood artifact caused by point-source syringe needle
M T Hackett1, S L Magoun, R B Thompson
1Nuclear Medicine Service, Department of Veterans Affairs Medical Centers, Lexington, Kentucky 40511-1093, USA.
Journal of Nuclear Medicine Technology
|March 1, 1997
Summary
To prevent artifacts in intrinsic flood imaging, avoid placing a syringe needle perpendicular to the camera face. This quality control method ensures accurate gamma camera uniformity assessment.
Area of Science:
- Medical Imaging
- Nuclear Medicine Technology
Background:
- Gamma camera quality control is crucial for accurate diagnostic imaging.
- Intrinsic floods are a standard method for assessing camera uniformity.
Purpose of the Study:
- Investigate the cause of nonuniformity artifacts during intrinsic flood acquisition.
- Identify optimal positioning of point sources for quality control.
Main Methods:
- Acquired intrinsic floods using three gamma cameras.
- Utilized a 1-cc syringe as a point source, with and without a needle.
- Positioned the syringe both perpendicular and parallel to the camera face.
Main Results:
- Nonuniformity artifacts were observed when a syringe with a needle was positioned perpendicular to the camera crystal.
- No artifacts were noted when the syringe was parallel or when no needle was used.
Conclusions:
- Syringe needle orientation significantly impacts intrinsic flood uniformity.
- To avoid artifacts, position the syringe parallel to the camera face during intrinsic flood acquisition.