Apparatus and method for smoothing random event data obtained from a Positron Emission Tomography scanner

Patent metadata

Field	Value
Publication number	US-8942452-B2
Application number	US-201213475584-A
Country	US
Kind code	B2
Filing date	May 18, 2012
Priority date	May 18, 2012
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

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)=u 0 (s, φ), corresponding to t=0, calculating second-order central differences u ss , u φφ with respect to s, φ, calculating a gradient u t , using u t =2(u ss +u φφ )−λ(u−u 0 ), where λ is a constant parameter, and updating the random event data using u(s, φ, t 2 )=u(s, φ, t 1 )+Δt u t , where Δt=t 2 −t 1 , t 1 =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.

First claim

The invention claimed is:

1. A method for smoothing random event data obtained from a Positron Emission Tomography (PET) scanner, the method comprising:
obtaining initial random event data u(s, φ, t=0)=u 0 (s, φ), corresponding to t=0, the initial random event data corresponding to line-of-responses of the PET scanner;
calculating second-order central differences u ss , u φφ with respect to s, φ;
calculating a gradient u t , using u t =2(u ss +u φφ )−λ(u−u 0 ), where λ is a c…

Assignees

• Niu Xiaofeng
• Wang Wenli
• Toshiba Kk
• Toshiba Medical Sys Corp

Inventors

• Niu Xiaofeng
• Wang Wenli

Classifications

• G06T12/10

  Physics · mapped topic

• G06T2207/10104

  Physics · mapped topic

• G06T5/20

  Physics · mapped topic

• G06T5/70 Primary

  Physics · mapped topic