首页|Patent Issued for X-ray multi-leaf dynamic collimation for multiplesource-in-mo tion tomosynthesis imaging system (USPTO 12042310)
Patent Issued for X-ray multi-leaf dynamic collimation for multiplesource-in-mo tion tomosynthesis imaging system (USPTO 12042310)
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NETL
NSTL
The following quote was obtained by the news editors from the background informa tion supplied bythe inventors: “Digital tomosynthesis (DTS) is a limited-angle tomography that eliminates overlappinganatomy or composite artefact. DTS facili tates improved lesion detection, depth localization and contrastresolution comp ared with regular radiography. Compared with CT, the cost and radiation dose of DTS aremuch lower. Therefore, DTS has been recommended as an alternative to bot h chest radiography and CTfollow up. In particular, DTS has shown greater diagn ostic performance for detecting pulmonary nodules.Because of multiple projectio ns used in DTS, the patient dose is higher compared to regular radiography.This invention describes a method for significant dose reduction using dynamic multi -leaf collimator. Thestate of art radiographic and DTS systems use rectangular collimators to restrict the X-ray beam. Thesecollimator openings typically are fixed to a certain field of view (FOV) size with rectangular shape, thereforthe y cannot performance dynamic region of interest exposures. In many diagnostic ta sk, only certainregion of interests (ROIs) is important and the rest of the are a are less or not important. Therefor exposureto the outside of ROI region can be reduced or totally blocked. Effective dose to patient can be measuredby dose -area product (DAP). By reducing the exposure area with dynamic collimator, the effective dosecan be dramatically reduced. For example, reducing a 40 cm x 40 c m field of view to that of 10 cm by 10cm can result in 16 times less of DAP. Th ere are prior arts of various collimation mechanism. However,there are disadvan tages in the prior arts. The first disadvantage is that although collimation sys tems inprior arts are motorized, but they are system of fixed collimation, not dynamic collimation. So, X-ray doseat prior arts is not reduced dynamically. Th e second disadvantage is that there is no artificial intelligenceinvolved in pr ior art. Collimation system in prior arts cannot decide precise location of regi ons of interestduring X-ray scan. The third disadvantage is that most collimato rs in prior art only are using single X-raysource not multi-sources. Multiple s ources require collimation in front of every single X-ray tube.”
NETL
NSTL
