TAPERED LIGHT GUIDE ASSEMBLY FOR POSITRON EMISSION TOMOGRAPHY (PET) SYSTEM
Publication Date: 2016-Apr-04
The IP.com Prior Art Database
A technique for fabricating a light guide assembly for a positron emission tomography (PET) system is disclosed. A taper is introduced in the light guide in order to angle portions of a detector block separately. According to the technique described herein, the detector module has two light guides, a first light guide and a second light guide. The first light guide has a thickness varying from about 1.5mm to about 2.4mm and the second light guide has a thickness varying from about 1.5mm to about 4mm.
The present disclosure relates generally to light guides for radiation detectors and more particularly to a technique for fabricating the light guide assembly for positron emission tomography (PET) system.
An ideal shape for a scintillator-based radiation detector of a PET system would be a cylinder so that each scintillator crystal is pointed directly towards the center of the detector. A close approximation of the ideal shape would be trapezoidal crystals with no gap between the scintillator crystals. Generally, PET detectors consist of a large number of detector modules mounted in the shape of a regular polygon. Between each side of the polygon is a small gap. When the number of sides of the polygon increases, the shape of the system is closer to the ideal shape.
Conventional electronics in the PET system include detector units having several detectors mounted in a single electronics board and the scintillation material is a significant portion of the cost of the PET system. Since, typically polygon described by the electronics and polygon described by the scintillator are identical except for their radius, increasing the number of sides of the polygon formed by the scintillator without increasing the number of electronics boards mounting the scintillation based detectors remains a challenge.
Conventional techniques including increasing the number of electronics boards, introducing a bent printed circuit (PCB) board, for example a flex circuit between boards, placing photo-detectors on a separate carrier PCB that has an inclined socket, and a detector system comprising heptahedron-shaped blocks distributed in 6 sub-rings are extremely expensive. Further, increasing gap size between detector panels is sub-optimal and difficult to correct via software.
It would be desirable to have an improved technique for fabricating light guide for a PET system.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts a detector module of a positron emission tomography system having two tapered light guides.
A technique for fabricating a light guide assembly for a positron emission tomography (PET) system is disclosed. A taper is introduced in the light guide in order to angle portions of a detector block separately.
The tapered light guide transports photons as well as aligns crystals within the detector. Wedge sha...