Implementation of true continuous bed motion in 2-D and 3-D whole-body PET scanning

True continuous axial bed motion has been implemented on a high-resolution positron emission tomography (PET) scanner for use in both two-dimensional (2-D) and three-dimensional (3-D) acquisition modes. This has been accomplished by modifications in the bed motion controller firmware and by acquirin...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2001-08, Vol.48 (4), p.1465-1469
Main Authors: Dahlbom, M., Reed, J., Young, J.
Format: Article
Language:English
Subjects:
Acquisitions
Computer hardware
Computer software
Data acquisition
Data handling
Emission
Firmware
Image quality
Image reconstruction
Image sampling
Imaging phantoms
Marketing
Microprogramming
Motion control
Positron emission tomography
Sampling
Scanning
Testing
Two dimensional displays
Variability
Whole-body PET
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Summary:True continuous axial bed motion has been implemented on a high-resolution positron emission tomography (PET) scanner for use in both two-dimensional (2-D) and three-dimensional (3-D) acquisition modes. This has been accomplished by modifications in the bed motion controller firmware and by acquiring data in list mode. The new bed controller firmware was shown to provide an accurate and constant bed speed down to 0.25 mm/s with a moderate patient weight load. The constant bed motion eliminates previously reported dead-time due to bed positioning when using small discrete bed steps. The continuous bed motion was tested on uniform phantoms, in 2-D and 3-D. As a result of the continuous axial motion, a uniform axial sensitivity is achieved. This was also reflected in the reconstructed images, which showed an improvement in axial image uniformity (1.4% for continuous sampling, 5.0% for discrete) as well as an improvement in %SD uniformity in comparison to conventional step-and-shoot acquisitions. The use of the continuous axial motion also provide slight improvements in 2-D emission and transmission scanning, resulting in an overall improved image quality in whole-body PET.
ISSN:0018-9499
1558-1578
DOI:10.1109/23.958381