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Respiratory motion adaptive reacquisition

IP.com Disclosure Number: IPCOM000029500D
Publication Date: 2004-Jul-01

Publishing Venue

The IP.com Prior Art Database

Abstract

ID611346

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ID611346

Respiratory motion adaptive reacquisition

Introduction

In this MEMO variants

of a new

Motion Adaptive Gating method

are described. The methods start with the acquisition of a

complete data set that lies

within a defined motion drift acceptance window. After

the complete data

set has

been collected, motion degraded data

is successively reacquired

until

a complete

1.

set

of data

is available within

the required respiratory conditions. The reacquisition process

is determined by detecting the respiratory information and using

it

be

to

as

a real time criterion

to decide which

of

the administered profiles

has

equally relevant optimizing

the efficiency also

for motion drifts.

In case of the DVA

method [1]
e. g. the

reacquisition process

is determined by evaluating the acquired profiles with respect to the most common position. This

has the

effect of correcting for motion drifts less efficient
[2]. The PAWS method [2] improves the scan efficiency

in case of motion drifts. Nevertheless in case that scans needs

reacquired.

The real time criterion hereby considers

the acquired diaphragm positions

as

to

be interrupted

the method does

not produce

any

or just corrupted data. The new

Motion Adaptive Gating methods hence enables

an efficient real time method, also in the

presence of motion drifts, improving image

quality with successive

acquisitions.

In section 2 a

general model

is presented. In 3 two

methods are formulated that apply to the general model

A general model

for respiratory motion adaptive reacquisition

in three phases:

Phase 1

In the first phase

all profiles within

a specified motion drift window

are measured. Due to respiratory motion these profiles

are measured in different motion states,

for example different diaphragm positions

and different phases

of the

respiratory cycle.

  The motion state of each profile

is measured

and stored

2. General model

for motion adaptive reacquisition

in

an administration (histogram). After phase

1

a

the administered profiles

and

a real time

2 criterion

complete set of

profiles is present. Due to

different respiratory conditions

of the image reconstruction will result in bad image quality.

Phase

are used

to determine which profile is reacquired for a

certain measured respiratory motion state. Just like

the profiles in phase 1 the

reacquired data

and their respiratory motion states

are stored. During phase

two more and more profiles with

a different respiratory motion state

are measured administered. From these profiles different complete sets with different respiratory motion characteristics can be selected for image production. These different complete sets converge until

one complete set meets the required respiratory condition.

two

In phase

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Phase

3

During phase 3 the

profiles that meet the respiratory requirements are selected for image production.

set

of profiles that satisfies

the selected respiratory criterion

best

  i s...