MRI apparatus and ASL imaging technique

Details MRI apparatus and ASL imaging technique MRI apparatus and ASL imaging technique

Filed on

2004-02-11

Date issued

2009-06-09

Examiner

Le, Long V (Department: 3768)

Patent Class

Electricity: measuring and testing

SubClass

Particle precession resonance

SubSubClass

Determine fluid flow rate

Other Related Categories

C324S307000, C324S309000

Type

Reexamination Certificate

Status

active

Patent number

07545141

Description

ABSTRACT:
An MRI apparatus obtains an ASL (Arterial Spin Labeling) image of a region to be imaged in a subject by performing a scan to the region to be imaged independently in a control mode and in a tag mode according to a pulse sequence based on an ASL technique. The pulse sequence includes a velocity-selective pulse, BVS (Band-limited Velocity-Selective)-pulse, that selectively excites magnetization spins in a blood flow passing through the region to be imaged and having a constant velocity range for the spins to undergo transition to transverse magnetization, and then performs excitation to cause the transverse magnetization to flip back to longitudinal magnetization. The velocity-selective pulse is formed in such a manner that the transverse magnetization excited in each of the control mode and the tag mode gives rise to a phase shift in an opposite polarity upon velocity-selective excitation.

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Wong et al., “Velocity Selective Arterial Spin Labeling,” Proc. Intl. Soc. Mag. Reson. Med 19 (2002).
Duhamel et al., “Evaluation of Systematic Quantification Errors in Velocity Selective Arterial Spin Labeling of the Brain”, Magnetic Resonance in Medicine 50: 145-153 (2003).

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