A noise equivalent counts approach to transmission imaging and source design

Noise equivalent counts are a convenient and effective means to assess PET emission image quality. The method is extended to include the effects of transmission imaging on the statistics of attenuation corrected PET data. The result of the calculations is a noise figure which describes the SNR perfo...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 1993-06, Vol.12 (2), p.287-292
Main Authors: Stearns, C.W., Wack, D.C.
Format: Article
Language:English
Subjects:
550601 - Medicine- Unsealed Radionuclides in Diagnostics
ACCURACY
ATTENUATION
Biological and medical sciences
COMPUTERIZED TOMOGRAPHY
Contamination
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
Extraterrestrial measurements
Geometry
Image quality
Investigative techniques, diagnostic techniques (general aspects)
MATHEMATICAL MODELS
Medical sciences
Miscellaneous. Technology
Noise figure
Performance evaluation
Pollution measurement
POSITRON COMPUTED TOMOGRAPHY
Positron emission tomography
Protocols
RADIOLOGY AND NUCLEAR MEDICINE
Radionuclide investigations
SIGNAL-TO-NOISE RATIO
TOMOGRAPHY
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Summary:Noise equivalent counts are a convenient and effective means to assess PET emission image quality. The method is extended to include the effects of transmission imaging on the statistics of attenuation corrected PET data. The result of the calculations is a noise figure which describes the SNR performance of the elements of the attenuation corrected emission sinogram. The noise figure demonstrates the tradeoff between emission and transmissions imaging performance, and can be used to determine optimal partitioning of imaging time between emission and transmission scans. Also, the technique can be used to compare the efficacy of simultaneous transmission/emission imaging techniques and multiple orbiting rod source geometries. Experimental and simulated results from the GE 2048 PET scanner are used to demonstrate the model. In a sample imaging situation in that system geometry, the dual rod source achieves 80% of the noise figure improvement which is available in simultaneous transmission/emission imaging without transmission data filtering, and demonstrates superior performance when a 3-point averaging transmission filter is applied.< >
ISSN:0278-0062
1558-254X
DOI:10.1109/42.232257