Title :
Preliminary resolution performance of the prototype system for a 4-Layer DOI-PET scanner: jPET-D4
Author :
Yamaya, Taiga ; Hagiwara, Naoki ; Obi, Takashi ; Tsuda, Tomoaki ; Kitamura, Keishi ; Hasegawa, Tomoyuki ; Haneishi, Hideaki ; Inadama, Naoko ; Yoshida, Eiji ; Murayama, Hideo
Author_Institution :
Nat. Inst. of Radiol. Sci., Chiba, Japan
fDate :
6/1/2006 12:00:00 AM
Abstract :
We are developing a high-performance brain PET scanner, jPET-D4, which provides 4-layer depth-of-interaction (DOI) information. The scanner is designed to achieve not only high spatial resolution but also high scanner sensitivity with the DOI information obtained from multi-layered thin crystals. The scanner has 5 rings of 24 detector blocks each, and each block consists of 1024 GSO crystals of 2.9 mm×2.9 mm×7.5 mm, which are arranged in 4 layers of 16×16 arrays. At this stage, a pair of detector blocks and a coincidence circuit have been assembled into an experimental prototype gantry. In this paper, as a preliminary experiment, we investigated the performance of the jPET-D4´s spatial resolution using the prototype system. First, spatial resolution was measured from a filtered backprojection reconstructed image. To avoid systematic error and reduce computational cost in image reconstruction, we applied the DOI compression (DOIC) method followed by maximum likelihood expectation maximization that we had previously proposed. Trade-off characteristics between background noise and resolution were investigated because improved spatial resolution is possible only when enhanced noise is avoided. Experimental results showed that the jPET-D4 achieves better than 3 mm spatial resolution over the field-of-view.
Keywords :
image reconstruction; image resolution; positron emission tomography; solid scintillation detectors; 4-Layer DOI-PET scanner; 4-layer depth-of-interaction information; DOI compression method; background noise; high scanner sensitivity; high-performance brain PET scanner; jPET-D4; maximum likelihood expectation maximization; multilayered thin GSO crystals; positron emission tomography; preliminary resolution performance; prototype gantry; statistical image reconstruction; trade-off characteristics; Assembly; Background noise; Circuits; Crystals; Detectors; Image reconstruction; Positron emission tomography; Prototypes; Sensor arrays; Spatial resolution; Depth-of-interaction (DOI); maximum likelihood expectation maximization (ML-EM); positron emission tomography (PET); statistical image reconstruction;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2006.871901