Nova Patents
US20030193337A1

Motion compensated spiral FISP MRI

Claim Score by NHIP

Read claim 1, the broadest

Abstract

Real-time imaging of a moving object such as the heart uses fast imaging with steady precession (FISP) traversing spirals in k-space. After flipping nuclear spins in the object within a slice to be imaged, signals are read out from the nuclear spins while applying read-out magnetic field gradients whereby read-out signals traverse spirals in k-space. Thereafter, the zero moment and first moment of the read-out gradients are driven to zero quickly so that fast imaging with steady state precession is realized without banding artifacts. Motion compensated rewinders are applied after the read-out magnetic field gradients which can be integral with the read-out gradients or comprise separate compensation lobes.

US20030193337A1, drawing sheet 1
Sheet 1 of 25

Term

Term ended

Projected expiry passed 8 January 2025, 1.7 years ago.

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  2. Published
  3. Projected expiry
  4. Today

22 claims: 2 independent, 20 dependent

  1. 1
    Broadest claimClaim Score 69, broad(NHIP)A method of real-time imaging in an object using magnetic resonance comprising the steps of:a) flipping nuclear spins in the object within a slice to be imaged, b) reading out signals from the nuclear spins while applying read-out magnetic field gradients whereby read-out signals traverse spirals in k-space, and c) driving the zero moment and first moment of the read-out gradients to zero after reading out signals whereby fast imaging with steady precession (FISP) is realized without banding artifacts.
  2. 12
    Apparatus for real-time imaging in an object using magnetic resonance comprising the steps of:a) means for flipping nuclear spins in the object within a slice to be imaged, b) means for reading out signals from the nuclear spins while applying read-out magnetic field gradients whereby read-out signals traverse spirals in k-space, and c) means for driving the zero moment and first moment of the read-out gradients to zero after reading out signals whereby fast imaging with steady precession (FISP) is realized without banding artifacts.
Independent claims2