Abstract
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.
Original language | English (US) |
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Pages (from-to) | 2691-2703 |
Number of pages | 13 |
Journal | Medical physics |
Volume | 34 |
Issue number | 7 |
DOIs | |
State | Published - 2007 |
Externally published | Yes |
Keywords
- Bow-tie filter
- Compensator
- Cone-beam CT
- Dose
- X-ray scatter
ASJC Scopus subject areas
- Biophysics
- Radiology Nuclear Medicine and imaging