Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Apparatus and method for smoothing random event data obtained from a Positron Emission Tomography scanner
A method and apparatus for smoothing random event data obtained from a Positron Emission Tomography (PET) scanner. The method includes obtaining initial random event data u(s, φ, t=0)=u0(s, φ), corresponding to t=0, calculating second-order central differences uss, uφφ with respect to s, φ, calculating a gradient ut, using ut=2(uss+uφφ)−λ(u−u0), where λ is a constant parameter, and updating the random event data using u(s, φ, t2)=u(s, φ, t1)+Δt ut, where Δt=t2−t1, t1=0 in a first iteration, and Δt is greater than 0. The method repeats the steps of calculating the second-order central differences, calculating the gradient, and updating the random event data until a change in u(s, φ, t) from a previous iteration is less than a predetermined threshold value.
Kabushiki Kaisha Toshiba Toshiba Medical Systems Corporation
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G06T G06T G06T G06T
inventional inventional additional inventional
Xiaofeng Wenli
Niu Wang