METHOD FOR MINIMIZING MOVING CONTAMINATION IN A COMPUTED TOMOGRAPHY COLLIMATOR
Publication Date: 2011-Dec-09
The IP.com Prior Art Database
The invention comprises of a technique for minimizing the particle contaminants which accumulate inside of a Computed Tomography collimator. Such particles cause artifacts and calibrations problems in the imaging device. The invention consists of applying a double sided adhesive sheet on the inside surfaces of the collimator on the side where centrifugal force or acceleration forces would tend to push particles. The double sided adhesive sheet act to gather and retain the particles.
FIELD OF INVENTION
The invention generally relates to medical imaging systems and more particularly to systems for minimizing contaminant particles in a Computed Tomography (CT) collimator.
BACKGROUND OF THE INVENTION
Generally in imaging equipment such as CT, particles may come into the x-ray path. Such particles may cause artifacts or calibration problems. Due to the conventional design of collimators, contamination inside the collimator causes artifacts and may cause calibrations to fail. There are multiple ways in which contamination may occur within a collimator. Some of the contaminants are lead particles from x-ray shielding used on the X-ray tube or collimator, metal particles from worn parts or scrapings of metal surfaces during installation of the collimator or X-ray tube on a system, particles introduced during the assembly process in manufacturing and various other types of contaminants. Not all the contaminating particles can be scavenged by a magnet. Further, totally enclosing the collimator in also not feasible in all phases of handling such as assembly of the component, assembly in a system, manufacturing, field etc.
Other conventional methods of reducing or avoiding particles inside of a collimator comprise cleaning by blowing out with compressed gas, covering the openings wiping surfaces or shaking the assembly, using magnets to scavenge magnetic metals, coating parts that may be susceptible to creating slivers or particles by contact, assembly procedures to minimize contacts between surfaces that may produce particles, using electrostatics to charge and retain particles among other methods. However none of the conventional methods address all the situations for particle creation and retention.
Hence there exists a need for a simple and effective method to minimize the contamination particles in a CT collimator.
BRIEF DESCRIPTION OF THE INVENTION
The invention provides a technique for minimizing the contaminant particles which collect inside a CT collimator by using a double sided adhesive sheet on the inside sur...