Premium
Compensators for dose and scatter management in cone‐beam computed tomography
Author(s) -
Graham S. A.,
Moseley D. J.,
Siewerdsen J. H.,
Jaffray D. A.
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2740466
Subject(s) - cone beam computed tomography , detector , beam (structure) , optics , image guided radiation therapy , medical imaging , cone beam ct , image quality , nuclear medicine , medical physics , computed tomography , physics , medicine , computer science , radiology , artificial intelligence , image (mathematics)
The ability of compensators (e.g., bow‐tie filters) designed for kV cone‐beam computed tomography (CT) to reduce both scatter reaching the detector and dose to the patient is investigated. Scattered x rays reaching the detector are widely recognized as one of the most significant challenges to cone‐beam CT imaging performance. With cone‐beam CT gaining popularity as a method of guiding treatments in radiation therapy, any methods that have the potential to reduce the dose to patients and/or improve image quality should be investigated. Simple compensators with a design that could realistically be implemented on a cone‐beam CT imaging system have been constructed to determine the magnitude of reduction of scatter and/or dose for various cone‐beam CT imaging conditions. Depending on the situation, the compensators were shown to reduce x‐ray scatter at the detector and dose to the patient by more than a factor of 2. Further optimization of the compensators is a possibility to achieve greater reductions in both scatter and dose.