Practical considerations of the Wiener filtering technique on projection data for PET
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- UGM Medical Systems, Philadelphia, PA (United States)
Wiener filtering (WF) attempt to recover a blurred object by incorporating the system modulation transfer function (MTF) and its noise characteristics. Although it has been widely studied in SPECT, few studies have been reported in PET. In this investigation, first, the authors discuss some factors in PET which affect the Poisson nature of the noise on data, such as the axial normalization, detector efficiency correction and randoms correction. Then the authors proposed a modified WF which compensates for the above factors. The modified WF provides a more accurate noise estimation method and a simple way to optimize the filter performance. Finally the authors apply the modified WF to projection data of the volumetric UGM PENN-PET 240H scanner in both transaxial and axial directions. A cold-hot sphere phantom and 3D brain phantom are used for evaluation. The modified WF is compared to the conventional WFs. The results indicate that (1) the conventional WFs may overestimate the noise power spectrum; (2) although the WFs are sensitive to the image statistics their overall performances are still quantitatively much better than without any restoration filtering; (3) in general, filtering in both axial and transaxial directions is better than the transaxial filtering only, but its superiority is more obvious when applied to scans with low image statistics; (4) in general, the Wiener filtering improves the PET image contrast and count recovery.
- DOE Contract Number:
- FG02-88ER60642
- OSTI ID:
- 6906807
- Report Number(s):
- CONF-931051--
- Journal Information:
- IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Vol. 41:4PT1; ISSN 0018-9499; ISSN IETNAE
- Country of Publication:
- United States
- Language:
- English
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62 RADIOLOGY AND NUCLEAR MEDICINE
CAMERAS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
FILTERS
GAMMA CAMERAS
IMAGE PROCESSING
OPTIMIZATION
PERFORMANCE
POSITRON CAMERAS
POSITRON COMPUTED TOMOGRAPHY
PROCESSING
RESOLUTION
SPATIAL RESOLUTION
TOMOGRAPHY