SCALABLE POSITRON EMISSION TOMOGRAPHY PET SYSTEM WITH SEGMENTED END SHIELDING
Publication Date: 2015-Oct-29
The IP.com Prior Art Database
A modular positron emission tomography PET detector that is factory and field scalable is disclosed The modular PET detector allows for manufacturing PET systems with a variety of radial and axial coverage The variation in radial and axial coverage is obtained by tiling multiple identical detector units The modular scalable PET detector uses anti scatter end shield that adjusts to match an axial extent of the PET detector The end shields are segmented to provide individual shielding to each PET detector module The segmented end shields are designed to allow mounting positions incrementally along an axial length of the PET detector module such that the segmented end shields always abut against the end most detector unit regardless of the axial extent configuration of a PET system A termination circuit board plugs into the PET detector module in each location that does not have a detector unit Also a cover encloses the termination circuit board and the segmented end shield attaches to the cover
The present invention relates generally to a positron emission tomography (PET) system and more particularly to a modular PET detector that is scalable.
Generally, a positron emission tomography (PET) detector is placed at the core of a PET imaging system. The detector includes components, such as, a scintillator material, photodiodes and electronic interface circuitry along with associated packaging, power and thermal control. Due to expense of the components used in the detector and need of complying with requirements of geometric accuracies, the radial and axial size of the detector is fixed. However, high cost associated with the large and fixed radial and axial size of the detector prevents varying radial and axial coverage of the detector within a PET system.
Further, even the largest practical axial extent PET system does not the cover entire patient anatomy in a single scan position. Therefore, patients are moved through a scanner in a series of steps that are proportional in size to the axial coverage of the detector. Also, effect of PET events is to be minimized on areas of the anatomy that are outside the PET axial coverage area.
It would be desirable to have an improved PET detector design that provides variable radial and axial coverage.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts examples of scalable end shields that abut against an end-most detector unit.
Figure 2 depicts a PET detector module that includes detector units, segmented end shield, a termination board and a termination board cover.
A modular positron emission tomography (PET) detector that is factory and field scalable is disclosed. The modular PET detector allows for manufacturing PET systems with a variety of radial and axial coverage. The variation in radial and axial coverage is obtained by tiling multiple identical detector units.
The modular scalable PET detector uses anti-scatter end shield that adjusts to match an axial extent of the PET detector. The end shield is placed at axial ends of the PET detector. The end shield is typically fabricated using a gamma radiation blocking material that is a high density material, such as, steel, lead, tungsten, or a composite of these. A full ring of end shield material has significant weight, and it must be handled, installed and removed during manufacturing and service of the PET system. On the other hand, the modular PET detector includes segmented end shields that provide individual shielding to each PET detector module. Each segmented shield is much lighter in weight, and allows for easy individual PET detector module installation and service. The segmented end shields are designed to allow mounting positions incrementally...