Other

Case Western Reserve University

Michael Wendt

Jeffrey L Duerk

Jonathan S Lewin

Ajit Shankaranarayanan

Yiu-Cho Chung

Qiang Zhang

Dee H Wu

Ajit Shankaranaravanan

Elmar M Merkle

Elmar Merkle

A method and system for improving image quality by correcting errors introduced by rotational motion of an object being imaged is provided. The object is associated with a fiducial mark. The method provides a computer executable methodology for detecting a rotation and selectively reordering, deleting and/or reacquiring projection data.

Reducing effects of rotational motion

An invasive device having an inductive coupling element. One embodiment of the invasive device includes a plurality of receive coils inductively coupled to a communicating coil. The receive coils are selectively tuned and detuned to receive MR signals for providing coordinate information used for device tracking. A second embodiment of the invasive device includes a receive coil having a plurality of winding elements separated from each other by different distances. A method of rapidly acquiring both the invasive device orientation and position information to dynamically adapt MR scan planes to continuously follow the invasive device relative to a target is provided. The target-navigation technique automatically defines the MR scan plane and a time domain multiplexing technique is applied for MR imaging and device tracking. Using these techniques, the acquired MR images shows both the invasive device and the target tissue.

MR invasive device and method for active MR guidance of invasive devices with target navigation

A method and system for improving image quality by correcting errors introduced by rotational motion of an object being imaged is provided (). The method provides a computer executable methodology for detecting a rotation () and selectively reordering (), deleting and/or reaquiring projection data ().

System and method for reducing effects of rotational motion

A magnetic resonance imaging (MRI) system ( ) performs optimized chemical-shift excitation. A computer system ( ) performs a constrained numerical optimization to determine radio frequency (RF) pulse amplitudes, phase angles, and interpulse intervals for a binomial-like RF pulse sequence that will excite magnetization ( ) of a selective one of two chemical species, such as water and fat for example, of a subject ( ) in relatively less time and that may therefore be used at lower magnetic fields. A static magnet ( ) produces a magnetic field along a predetermined axis relative to the subject Pulse sequence apparatus ( ) creates magnetic field gradients with the magnetic field, applies RF pulsed magnetic fields, and receives resulting RF magnetic resonance (MR) signals. Pulse sequence control apparatus ( ) controls the pulse sequence apparatus to apply the binomial-like RF pulse sequence to the subject. The computer system reconstructs an image from received RF MR signals resulting from application of the binomial-like RF pulse sequence.

Magnetic resonance imaging (MRI) optimized chemical-shift excitation

A method for correcting MRI motion artifacts and main field fluctuations. A series of data prints are acquired at read points along a radial axis to form a view ( ). Subsequent views define a NMR data set. A processor stores the NMR data set and reconstructs an image array from a stored NMR data set by; a) reconstructing the NMR data set along a radial axis; b) producing a correction data array including correction values where each of the correction values is calculated as a function of the corresponding stored NMR datum and the stored NMR datum for the intersection of the first and subsequent projection ( ) axes; c) applying the data in the correction array to the NMR data set to produce a final NMrR data set.

Growing community of inventors

Erlangen, Germany

Michael Wendt