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Brain SPECT artifacts in patients having metallic cranioplasty.
M T Hackett1, W J Shih, V H Kiefer
1Radiation Safety Office and Nuclear Medicine Service, Department of Veterans Affairs Medical Center, Lexington, Kentucky 40511-1093, USA. michael.hackett@med.va.gov
Journal of Nuclear Medicine Technology
|January 5, 2002
Summary
Metallic cranioplasty can cause photon-deficient artifacts in brain SPECT scans, extending into the scalp. Phantom studies reveal an additional peripheral tracer activity artifact, crucial for interpreting scans with limited patient history.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Radiology
Background:
- Brain SPECT imaging is vital for assessing neurological conditions.
- Metallic cranioplasty, used after head trauma, can introduce imaging artifacts.
- Previous studies noted photon-deficient areas in SPECT scans with metallic implants.
Purpose of the Study:
- To investigate the extent and pattern of artifacts caused by metallic cranioplasty in brain SPECT studies.
- To compare artifacts observed in patient studies with those in controlled phantom studies.
- To characterize the nature of photon-deficient and peripheral tracer activity artifacts.
Main Methods:
- SPECT brain phantom studies were conducted using metallic sheets to simulate cranioplasty plates.
- Lead sheets were used to represent tantalum plates, common in cranioplasty.
- Phantom data was compared with transaxial images from patients who underwent brain SPECT after metallic cranioplasty.
Main Results:
- Phantom studies with lead simulating metallic plates showed photon-deficient areas extending into the scalp region.
- Increased tracer activity was observed at the periphery of these photon-deficient areas, mimicking patient study findings.
- No such artifacts were present in phantom studies performed without metallic sheets.
Conclusions:
- Radiopaque metallic plates in brain SPECT studies are expected to cause photon-deficient artifacts.
- An additional artifact of increased peripheral tracer activity extending to the scalp is demonstrated.
- Recognizing these specific artifacts is beneficial for accurate interpretation, especially with incomplete patient history or radiographic data.